A static analysis tool for Python





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Apache Software License




Pyanalyze is a tool for programmatically detecting common mistakes in Python code, such as references to undefined variables and type errors. It can be extended to add additional rules and perform checks specific to particular functions.

Some use cases for this tool include:

  • Catching bugs before they reach production. The script will catch accidental mistakes like writing "collections.defalutdict" instead of "collections.defaultdict", so that they won't cause errors in production. Other categories of bugs it can find include variables that may be undefined at runtime, duplicate keys in dict literals, and missing await keywords.
  • Making refactoring easier. When you make a change like removing an object attribute or moving a class from one file to another, pyanalyze will often be able to flag code that you forgot to change.
  • Finding dead code. It has an option for finding Python objects (functions and classes) that are not used anywhere in the codebase.
  • Checking type annotations. Type annotations are useful as documentation for readers of code, but only when they are actually correct. Although pyanalyze does not support the full Python type system (see below for details), it can often detect incorrect type annotations.


You can install pyanalyze with:

$ pip install pyanalyze

Once it is installed, you can run pyanalyze on a Python file or package as follows:

$ python -m pyanalyze
$ python -m pyanalyze package/

But note that this will try to import all Python files it is passed. If you have scripts that perform operations without if __name__ == "__main__": blocks, pyanalyze may end up executing them.

In order to run successfully, pyanalyze needs to be able to import the code it checks. To make this work you may have to manually adjust Python's import path using the $PYTHONPATH environment variable.

Pyanalyze has a number of command-line options, which you can see by running python -m pyanalyze --help. Important ones include -f, which runs an interactive prompt that lets you examine and fix each error found by pyanalyze, and --enable/--disable, which enable and disable specific error codes.

Advanced usage

At Quora, when we want pyanalyze to check a library in CI, we write a unit test that invokes pyanalyze for us. This allows us to run pyanalyze with other tests without further special setup, and it provides a convenient place to put configuration options. An example is pyanalyze's own test:

import os.path
import pyanalyze
from pyanalyze.error_code import ErrorCode
from pyanalyze.test_node_visitor import skip_before

class PyanalyzeConfig(pyanalyze.config.Config):
    DEFAULT_DIRS = (str(os.path.dirname(__file__)),)
    DEFAULT_BASE_MODULE = pyanalyze

class PyanalyzeVisitor(pyanalyze.name_check_visitor.NameCheckVisitor):
    config = PyanalyzeConfig()
    should_check_environ_for_files = False

@skip_before((3, 6))
def test_all():

if __name__ == "__main__":

Extending pyanalyze

The main way to extend pyanalyze is by providing a specification for a particular function. This allows you to run arbitrary code that inspects the arguments to the function and raises errors if something is wrong.

As an example, suppose your codebase contains a function database.run_query() that takes as an argument a SQL string, like this:

database.run_query("SELECT answer, question FROM content")

You want to detect when a call to run_query() contains syntactically invalid SQL or refers to a non-existent table or column. You could set that up with code like this:

import pyanalyze
from pyanalyze.error_code import ErrorCode
from pyanalyze.signature import CallContext, Signature, SigParameter
from pyanalyze.value import KnownValue, TypedValue, UNRESOLVED_VALUE, Value

from database import run_query, parse_sql

def run_query_impl(ctx: CallContext) -> Value:
    sql = ctx.vars["sql"]
    if not isinstance(sql, KnownValue) or not isinstance(sql.val, str):
            "Argument to run_query() must be a string literal",
        return UNRESOLVED_VALUE

        parsed = parse_sql(sql)
    except ValueError as e:
            f"Invalid sql passed to run_query(): {e}",
        return UNRESOLVED_VALUE

    # check that the parsed SQL is valid...

    # pyanalyze will use this as the inferred return type for the function
    return TypedValue(list)

class Config(pyanalyze.config.Config):
    def get_known_argspecs(self, arg_spec_cache):
        return {
            # This infers the parameter types and names from the function signature
            run_query: arg_spec_cache.get_argspec(
                run_query, impl=run_query_impl
            # You can also write the signature manually
            run_query: Signature.make(
                [SigParameter("sql", annotation=TypedValue(str))],

Displaying and checking the type of an expression

You can use pyanalyze.extensions.reveal_type(expr) to display the type pyanalyze infers for an expression. This can be useful to understand errors or to debug why pyanalyze does not catch a particular issue. For example:

from pyanalyze.extensions import reveal_type

reveal_type(1)  # Revealed type is 'Literal[1]' (code: inference_failure)

This function is also considered a builtin while type checking, so you can use reveal_type() in code that is type checked but not run.

For callable objects, reveal_type() will also display the signature inferred by pyanalyze:

from pyanalyze.extensions import reveal_type

reveal_type(reveal_type)  # Revealed type is 'Literal[<function reveal_type at 0x104bf55e0>]', signature is (value, /) -> None (code: inference_failure)

A similar function, pyanalyze.dump_value, can be used to get lower-level details of the Value object pyanalyze infers for an expression.

Similarly, you can use pyanalyze.assert_is_value to assert that pyanalyze infers a particular type for an expression. This requires importing the appropriate Value subclass from pyanalyze.value. For example:

from pyanalyze import assert_is_value
from pyanalyze.value import KnownValue

assert_is_value(1, KnownValue(1))  # succeeds
assert_is_value(int("2"), KnownValue(1))  # Bad value inference: expected KnownValue(val=1), got TypedValue(typ=<class 'int'>) (code: inference_failure)

This function is mostly useful when writing unit tests for pyanalyze or an extension.

Ignoring errors

Sometimes pyanalyze gets things wrong and you need to ignore an error it emits. This can be done as follows:

  • Add # static analysis: ignore on a line by itself before the line that generates the erorr.
  • Add # static analysis: ignore at the end of the line that generates the error.
  • Add # static analysis: ignore at the top of the file; this will ignore errors in the entire file.

You can add an error code, like # static analysis: ignore[undefined_name], to ignore only a specific error code. This does not work for whole-file ignores. If the bare_ignore error code is turned on, pyanalyze will emit an error if you don't specify an error code on an ignore comment.

Python version support

Pyanalyze supports Python 3.6 through 3.9. Because it imports the code it checks, you have to run it using the same version of Python you use to run your code.


Pyanalyze is built on top of two lower-level abstractions: Python's built-in ast module and our own node_visitor abstraction, which is an extension of the ast.NodeVisitor class.

Python AST module

The ast module ( provides access to the abstract syntax tree (AST) of Python code. The AST is a tree-based representation of the structure of a Python program. For example, the string "import a" resolves into this AST:

# ast.parse considers everything to be a module
    # the module contains one statement of type Import
        # names is a list; it would contain multiple elements for "import a, b"
                # if we did "import a as b", this would be "b" instead of None

The ast.NodeVisitor class provides a convenient way to run code that inspects an AST. For each AST node type, a NodeVisitor subclass can implement a method called visit_<node type>. When the visitor is run on an AST, this method will be called for each node of that type. For example, the following class could be used to find import statements:

class ImportFinder(ast.NodeVisitor):
    def visit_Import(self, node):
        print("Found import statement: %s" % ast.dump(node))

Pyanalyze uses an extension to ast.NodeVisitor, implemented in pyanalyze/, that adds two main features: management of files to run the visitor on and management of errors that are found by the visitor.

The following is a simple example of a visitor using this abstraction---a visitor that will show an error for every assert and import statement found:

import enum
from pyanalyze import node_visitor

class ErrorCode(enum.Enum):
    found_assert = 1
    found_import = 2

class BadStatementFinder(node_visitor.BaseNodeVisitor):
    error_code_enum = ErrorCode

    def visit_Assert(self, node):
        self.show_error(node, error_code=ErrorCode.found_assert)

    def visit_Import(self, node):
        self.show_error(node, error_code=ErrorCode.found_import)

if __name__ == '__main__':

As an example, we'll run the visitor on a file containing this code:

import a
assert True

Running the visitor without arguments gives the following output:

$ python
Error: found_import (code: found_import)
In at line 1:
   1: import a
   2: assert True

Error: found_assert (code: found_assert)
In at line 2:
   1: import a
   2: assert True

Using information stored in the node that caused the error, the show_error method finds the line and column in the Python source file where the error appears.

Passing an error_code argument to show_error makes it possible to conditionally suppress errors by passing a --disable command-line argument:

$ python --disable found_import
Error: found_assert (code: found_assert)
In at line 2:
   1: import a
   2: assert True

Subclasses of BaseNodeVisitor can specify which errors are enabled by default by overriding is_enabled_by_default and the description shown for an error by overriding get_description_for_error_code.


Fundamentally, the way pyanalyze works is that it tries to infer, with as much precision as possible, what Python value or what kind of Python value each node in a file's AST corresponds to, and then uses that information to flag code that does something undesirable. Mostly, that involves identifying code that will cause the Python interpreter to throw an error at runtime, for example because it accesses an attribute that doesn't exist or because it passes incorrect arguments to a function. As much as possible, the script tries to evaluate whether an operation is allowed by asking Python whether it is: for example, whether the arguments to a function call are correct is decided by creating a function with the same arguments as the called function, calling it with the same arguments as in the call, and checking whether the call throws an error.

This is done by recursively visiting the AST of the file and building up a context of information gathered from previously visited nodes. For example, the visit_ClassDef method visits the body of the class within a context that indicates that AST nodes are part of the class, which enables method definitions within the class to infer the type of their self arguments as being the class. In some cases, the visitor will traverse the AST twice: once to collect places where names are set, and once again to check that every place a name is accessed is valid. This is necessary because functions may use names that are only defined later in the file.

Name resolution

The name resolution component of pyanalyze makes it possible to connect usage of a Python variable with the place where it is defined.

Pyanalyze uses the StackedScopes class to simulate Python scoping rules. This class contains a stack of nested scopes, implemented as dictionaries, that contain names defined in a particular Python scope (e.g., a function). When the script needs to determine what a particular name refers to, it iterates through the scopes, starting at the top of the scope stack, until it finds a scope dictionary that contains the name. This is similar to how name lookup is implemented in Python itself. When a name that is accessed in Python code is not found in any scope object, pyanalyze will throw an error with code undefined_name.

When the script is run on a file, the scopes object is initialized with two scope levels containing builtin objects such as len and Exception and the file's module-level globals (found by importing the file and inspecting its __dict__). When it inspects the AST, it adds names that it finds in assignment context into the appropriate nested scope. For example, when the scripts sees a FunctionDef AST node, it adds a new function-level scope, and if the function contains a statement like x = 1, it will add the variable x to the function's scope. Then when the function accesses the variable x, the script can retrieve it from the function-level scope in the StackedScopes object.

The following scope types exist:

  • builtin_scope is at the bottom of every scope stack and contains standard Python builtin objects.
  • module_scope is always right above builtin_scope and contains module-global names, such as classes and functions defined at the global level in the file.
  • class_scope is entered whenever the AST visitor encounters a class definition. It can contain nested class or function scopes.
  • function_scope is entered for each function definition.

The function scope has a more complicated representation than the others so that it can reflect changes in values during the execution of a function. Broadly speaking, pyanalyze collects the places where every local variable is either written (definition nodes) or read (usage nodes), and it maps every usage node to the set of possible definition nodes that the value may come from. For example, if a variable is written to and then read on the next line, the usage node on the second line is mapped to the definition node on the first line only, but if a variable is set within both the if and the else branch of an if block, a usage after the if block will be mapped to definition nodes from both the if and the else block. If the variable is never set in some branches, a special marker object is used again, and pyanalyze will emit a possibly_undefined_name error.

Function scopes also support constraints. Constraints are restrictions on the values a local variable may take. For example, take the following code:

def f(x: Union[int, None]) -> None:
    dump_value(x)  # Union[int, None]
    if x is not None:
        dump_value(x)  # int

In this code, the x is not None check is translated into a constraint that is stored in the local scope, similar to how assignments are stored. When a variable is used within the block, we look at active constraints to restrict the type. In this example, this makes pyanalyze able to understand that within the if block the type of x is int, not Union[int, None].

The following constructs are understood as constraints:

  • if x is (not) None
  • if (not) x
  • if isinstance(x, <some type>)
  • if issubclass(x, <some type>)
  • if len(x) == <some value>
  • A function returning a TypeGuard or similar construct

Constraints are used to restrict the types of:

  • Local variables
  • Instance variables (e.g., after if self.x is None, the type of self.x is restricted)
  • Nonlocal variables (variables defined in enclosing scopes)

Type and value inference

Just knowing that a name has been defined doesn't tell what you can do with the value stored for the name. To get this information, each node visit method in can return an instance of the Value class representing the Python value that corresponds to the AST node. We also use type annotations in the code under consideration to get types for more values. Scope dictionaries also store Value instances to represent the values associated with names.

The following subclasses of Value exist:

  • UnresolvedValue (with a single instance, UNRESOLVED_VALUE), representing that the script knows nothing about the value a node can contain. For example, if a file contains only the function def f(x): return x, the name x will have UNRESOLVED_VALUE as its value within the function, because there is no information to determine what value it can contain.
  • KnownValue represents a value for which the script knows the concrete Python value. If a file contains the line x = 1 and no other assignments to x, x will contain KnownValue(1).
  • TypedValue represents that the script knows the type but not the exact value. If the only assignment to x is a line x = int(some_function()), the script infers that x contains TypedValue(int). More generally, the script infers any call to a class as resulting in an instance of that class. The type is also inferred for the self argument of methods, for comprehensions, for function arguments with type annotations, and in a few other cases. This class has several subtypes:
    • NewTypeValue corresponds to typing.NewType; it indicates a distinct type that is identical to some other type at runtime. At Quora we use newtypes for helper types like qtype.Uid.
    • GenericValue corresponds to generics, like List[int].
  • MultiValuedValue indicates that multiple values are possible, for example because a variable is assigned to in multiple places. After the line x = 1 if condition() else 'foo', x will contain MultiValuedValue([KnownValue(1), KnownValue('foo')]). This corresponds to typing.Union.
  • UnboundMethodValue indicates that the value is a method, but that we don't have the instance the method is bound to. This often comes up when a method in a class SomeClass contains code like self.some_other_method: we know that self is a TypedValue(SomeClass) and that SomeClass has a method some_other_method, but we don't have the instance that self.some_other_method will be bound to, so we can't resolve a KnownValue for it. Returning an UnboundMethodValue in this case makes it still possible to check whether the arguments to the method are valid.
  • ReferencingValue represents a value that is a reference to a name in some other scopes. This is used to implement the global statement: global x creates a ReferencingValue referencing the x variable in the module scope. Assignments to it will affect the referenced value.
  • SubclassValue represents a class object of a class or its subclass. For example, in a classmethod, the type of the cls argument is a SubclassValue of the class the classmethod is defined in. At runtime, it is either this class or a subclass.
  • NoReturnValue indicates that a function will never return (e.g., because it always throws an error), corresponding to typing.NoReturn.

Each Value object has a method can_assign that checks whether types are correct. The call X.can_assign(Y, ctx) essentially answers the question: if we expect a value X, is it legal to pass a value Y instead? For example, TypedValue(int).can_assign(KnownValue(1), ctx) will succeed, because 1 is a valid int, but TypedValue(int).can_assign(KnownValue("1"), ctx) will fail, because "1" is not. In order to help with type checking generics, the return value of can_assign is a (possibly empty) dictionary of type variables mapping to their values.

Call compatibility

When the visitor encounters a Call node (representing a function call) and it can resolve the object being called, it will check that the object can in fact be called and that it accepts the arguments given to it. This checks only the number of arguments and the names of keyword arguments, not their types.

The first step in implementing this check is to retrieve the signature for the callee. Python provides the inspect.signature function to do this, but for some callables additional logic is required. In addition, pyanalyze uses typeshed, a repository of types for standard library modules, to produce more precise signatures.

Once we have the signature, we can figure out whether the arguments passed to the callee in the AST node under consideration are compatible with the signature. This is done with the signature's bind() method. The abstraction also supports providing an implementation function for a callable, a function that gets called with the types of the arguments to the function and that computes a more specific return type or checks the arguments.

Non-existent object attributes

Python throws a runtime AttributeError when you try to access an object attribute that doesn't exist. Pyanalyze can statically find some kinds of code that will access non-existent attribute. The simpler case is when code accesses an attribute of a KnownValue , like in a file that has import os and then accesses os.ptah. In this case, we know the value that os contains, so we can try to access the attribute ptah on it, and show an error if the attribute lookup fails. Similarly, os.path will return a KnownValue of the os.path module, so that we can also check attribute lookups on os.path.

Another class of bugs involves objects accessing attributes on self that don't exist. For example, an object may set self.promote in its __init__ method, but then access self.promotion in its tree method. To detect such cases, pyanalyze uses the ClassAttributeChecker class. This class keeps a record of every node where an attribute is written or read on a TypedValue. After checking all code that uses the class, it then takes the difference between the sets of read and written values and shows an error for every attribute that is read but never written. This approach is complicated by inheritance---subclasses may read values only written on the superclass, and vice versa. Therefore, the check doesn't trigger for any attribute that is set on any superclass or subclass of the class under consideration. It also doesn't trigger for any attributes of a class that has a base class that wasn't itself examined by the ClassAttributeChecker. This was needed to deal with Thrift classes that used attributes defined in superclasses outside of code checked by pyanalyze. Two superclasses are excluded from this, so that undefined attributes are flagged on their subclasses even though hasn't examined their definitions: object (the superclass of every class) and qutils.webnode2.Component (which doesn't define any attributes that are read by its subclasses).

Finding unused code

Because pyanalyze tries to resolve all names and attribute lookups in code in a package, it was easy to extend it to determine which of the classes and functions defined in the package aren't accessed in any other code. This is done by recording every name and attribute lookup that results in a KnownValue containing a function or class defined in the package. After the AST visitor run, it compares the set of accessed objects with another set of all the functions and classes that are defined in submodules of the package. All objects that appear in the second set but not the first are probably unused. (There are false positives, such as functions that are registered in some registry by decorators, or those that are called from outside of a itself.) This check can be run by passing the --find-unused argument to pyanalyze.

Type system

Pyanalyze supports most of the Python type system, as specified in PEP 484 and various later PEPs and in the Python documentation. It uses type annotations to infer types and checks for type compatibility in calls and return types. Supported type system features include generics like List[int], NewType, TypedDict, TypeVar, and Callable.

However, support for some features is still missing or incomplete, including:

  • Overloaded functions
  • Bounds, constraints, and variance of TypeVars
  • NewType over non-trivial types
  • Missing and required keys in TypedDict
  • Protocols (PEP 544)
  • ParamSpec (PEP 612)


In addition to the standard Python type system, pyanalyze supports a number of non-standard extensions:

  • Callable literals: you can declare a parameter as Literal[some_function] and it will accept any callable assignable to some_function. Pyanalyze also supports Literals of various other types in addition to those supported by PEP 586.
  • pyanalyze.extensions.AsynqCallable is a variant of Callable that applies to asynq functions.
  • pyanalyze.extensions.ParameterTypeGuard is a generalization of PEP 649's TypeGuard that allows guards on any parameter to a function. To use it, return Annotated[bool, ParameterTypeGuard["arg", SomeType]].
  • pyanalyze.extensions.HasAttrGuard is a similar mechanism that allows indicating that an object has a particular attribute. To use it, return Annotated[bool, HasAttrGuard["arg", "attribute", SomeType]].
  • pyanalyze.extensions.ExternalType is a way to refer to a type that cannot be referenced by name in contexts where using if TYPE_CHECKING is not possible.

They are explained in more detail below.

Extended literals

Literal types are specified by PEP 586. The PEP only supports Literals of int, str, bytes, bool, Enum, and None objects, but pyanalyze accepts Literals over all Python objects.

As an extension, pyanalyze accepts any compatible callable for a Literal over a function type. This allows more flexible callable types.

For example:

from typing_extensions import Literal

def template(x: int, y: str = "") -> None:

def takes_template(func: Literal[template]) -> None:
    func(x=1, y="x")

def good_callable(x: int, y: str = "default", z: float = 0.0) -> None:

takes_template(good_callable)  # accepted

def bad_callable(not_x: int, y: str = "") -> None:

takes_template(bad_callable)  # rejected


The @asynq() callable in the asynq framework produces a special callable that can either be called directly (producing a synchronous call) or through the special .asynq() attribute (producing an asynchronous call). The AsynqCallable special form is similar to Callable, but describes a callable with this extra .asynq() attribute.

For example, this construct can be used to implement the helper function:

from asynq import asynq
from pyanalyze.extensions import AsynqCallable
from typing import TypeVar, List, Iterable

T = TypeVar("T")
U = TypeVar("U")

def amap(function: AsynqCallable[[T], U], sequence: Iterable[T]) -> List[U]:
    return (yield [function.asynq(elt) for elt in sequence])

Because of limitations in the runtime typing library, some generic aliases involving AsynqCallable will not work at runtime. For example, given a generic alias L = List[AsynqCallable[[T], int]], L[str] will throw an error. Quoting the type annotation works around this.


PEP 647 added support for type guards, a mechanism to narrow the type of a variable. However, it only supports narrowing the first argument to a function.

Pyanalyze supports an extended version that combines with PEP 593's Annotated type to support guards on any function parameter.

For example, the below function narrows the type of two of its parameters:

from typing import Iterable, Annotated
from pyanalyze.extensions import ParameterTypeGuard
from pyanalyze.value import KnownValue, Value

def _can_perform_call(
    args: Iterable[Value], keywords: Iterable[Value]
) -> Annotated[
    ParameterTypeGuard["args", Iterable[KnownValue]],
    ParameterTypeGuard["keywords", Iterable[KnownValue]],
    return all(isinstance(arg, KnownValue) for arg in args) and all(
        isinstance(kwarg, KnownValue) for kwarg in keywords


HasAttrGuard is similar to ParameterTypeGuard and TypeGuard, but instead of narrowing a type, it indicates that an object has a particular attribute. For example, consider this function:

from typing import Literal, Annotated
from pyanalyze.extensions import HasAttrGuard

def has_time(arg: object) -> Annotated[bool, HasAttrGuard["arg", Literal["time"], int]]:
    attr = getattr(arg, "time", None)
    return isinstance(attr, int)

After a call to has_time(o) succeeds, pyanalyze will know that o.time exists and is of type int.

In practice the main use of this type is to implement the type of hasattr itself. In pure Python hasattr could look like this:

from typing import Any, TypeVar, Annotated
from pyanalyze.extensions import HasAttrGuard

T = TypeVar("T", bound=str)

def hasattr(obj: object, name: T) -> Annotated[bool, HasAttrGuard["obj", T, Any]]:
        getattr(obj, name)
        return True
    except AttributeError:
        return False

As currently implemented, HasAttrGuard does not narrow types; instead it preserves the previous type of a variable and adds the additional attribute.


ExternalType is a way to refer to a type that is not imported at runtime. The type must be fully qualified.

from pyanalyze.extensions import ExternalType

def function(arg: "other_module.Type") -> None:

To resolve the type, pyanalyze will import other_module, but the module using ExternalType does not have to import other_module.

typing.TYPE_CHECKING can be used in a similar fashion, but ExternalType can be more convenient when programmatically generating types. Our motivating use case is our database schema definition file: we would like to map each column to the enum it corresponds to, but those enums are defined in code that should not be imported by the schema definition.


Python is sufficiently dynamic that almost any check like the ones run by pyanalyze will inevitably have false positives: cases where the script sees an error, but the code in fact runs fine. Attributes may be added at runtime in hard-to-detect ways, variables may be created by direct manipulation of the globals() dictionary, and the mock module can change anything into anything. Although pyanalyze has a number of whitelists to deal with these false positives, it is usually better to write code in a way that doesn't require use of the whitelist: code that's easier for the script to understand is probably also easier for humans to understand.

Just as the tool inevitably has false positives, it equally inevitably cannot find all code that will throw a runtime error. It is generally impossible to statically determine what a program does or whether it runs successfully without actually running the program. Pyanalyze doesn't check program logic and it cannot always determine exactly what value a variable will have. It is no substitute for unit tests.

Developing pyanalyze

Pyanalyze has hundreds of unit tests that check its behavior. To run them, you can just run pytest in the project directory.

The code is formatted using Black.



  • Add pyanalyze.extensions.ExternalType

Version 0.3.1 (August 11, 2021)

  • Exit with a non-zero exit code when errors occur (contributed by C.A.M. Gerlach)
  • Type check the working directory if no command-line arguments are given (contributed by C.A.M. Gerlach)

Version 0.3.0 (August 1, 2021)

  • Type check calls on Unions properly
  • Add pyanalyze executable
  • Add --enable-all and --disable-all flags (contributed by C.A.M. Gerlach)
  • Bug fixes

Version 0.2.0 (May 17, 2021)

  • Drop support for Python 2 and 3.5
  • Improve unused object finder
  • Add support for TypeVar
  • Add support for Callable
  • Add pyanalyze.extensions
  • Add pyanalyze.ast_annotator
  • Numerous other bug fixes and improvements

Version 0.1.0 (May 29, 2020)

  • Initial public release

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