Fix various typos (#5355)

Author: ceh

docs/source/installed_packages.rst

@@ -99,7 +99,7 @@ the setup.py might look like:
     )
 
 In this example, both ``lib.py`` and ``lib.pyi`` exist. At runtime, the Python
-interpeter will use ``lib.py``, but mypy will use ``lib.pyi`` instead.
+interpreter will use ``lib.py``, but mypy will use ``lib.pyi`` instead.
 
 If the package is stub-only (not imported at runtime), the package should have
 a prefix of the runtime package name and a suffix of ``-stubs``.

docs/source/more_types.rst

@@ -17,8 +17,8 @@ Here's a quick summary of what's covered here:
   just an ``int`` at runtime.
 
 * ``@overload`` lets you define a function that can accept multiple distinct
-  signatures. This is useful for if you need to encode a relationship between
-  the arguments and the return type that would be difficult to express normally.
+  signatures. This is useful if you need to encode a relationship between the
+  arguments and the return type that would be difficult to express normally.
 
 * ``TypedDict`` lets you give precise types for dictionaries that represent
   objects with a fixed schema, such as ``{'id': 1, 'items': ['x']}``.
@@ -474,7 +474,7 @@ the following unsafe overload definition:
             return "some string"
 
 On the surface, this function definition appears to be fine. However, it will
-result in a discrepency between the inferred type and the actual runtime type
+result in a discrepancy between the inferred type and the actual runtime type
 when we try using it like so:
 
 .. code-block:: python

mypy/build.py

@@ -188,7 +188,7 @@ def default_flush_errors(new_messages: List[str], is_serious: bool) -> None:
         raise
 
 
-# python_path is usercode, mypy_path is set via config or envionment variable,
+# python_path is usercode, mypy_path is set via config or environment variable,
 # package_path is calculated by _get_site_packages_dirs, and typeshed_path points
 # to typeshed. Each is a tuple of paths to be searched in find_module()
 SearchPaths = NamedTuple('SearchPaths',
@@ -508,7 +508,7 @@ def cache_meta_from_dict(meta: Dict[str, Any],
     Args:
       meta: JSON metadata read from the metadata cache file
       data_json: Path to the .data.json file containing the AST trees
-      deps_json: Optionally, path to the .deps.json file containign
+      deps_json: Optionally, path to the .deps.json file containing
                  fine-grained dependency information.
     """
     sentinel = None  # type: Any  # Values to be validated by the caller
@@ -2766,7 +2766,7 @@ def process_graph(graph: Graph, manager: BuildManager) -> None:
         undeps = set()
         if fresh:
             # Check if any dependencies that were suppressed according
-            # to the cache have heen added back in this run.
+            # to the cache have been added back in this run.
             # NOTE: Newly suppressed dependencies are handled by is_fresh().
             for id in scc:
                 undeps.update(graph[id].suppressed)

mypy/checker.py

@@ -2904,7 +2904,7 @@ def partition_by_callable(self, typ: Type,
         if isinstance(typ, TypeVarType):
             # We could do better probably?
             # Refine the the type variable's bound as our type in the case that
-            # callable() is true. This unfortuantely loses the information that
+            # callable() is true. This unfortunately loses the information that
             # the type is a type variable in that branch.
             # This matches what is done for isinstance, but it may be possible to
             # do better.