Add undocumented but occasionally used attributes to inspect.pyi. (#1864)

* Add attributes not in docs to 2/inspect.pyi.
* Add attributes not in docs to 3/inspect.pyi.
* Change list to List[Any] in 2/inspect.pyi

stdlib/2/inspect.pyi

@@ -1,7 +1,27 @@
-from types import TracebackType, FrameType, ModuleType
-from typing import Any, Dict, Callable, List, Optional, Tuple, Union, NamedTuple, Type
+from types import CodeType, TracebackType, FrameType, ModuleType
+from typing import Any, Dict, Callable, List, NamedTuple, Optional, Sequence, Tuple, Type, Union
 
 # Types and members
+class EndOfBlock(Exception): ...
+
+class BlockFinder:
+    indent: int
+    islambda: bool
+    started: bool
+    passline: bool
+    last: int
+    def tokeneater(self, type: int, token: str, srow_scol: Tuple[int, int],
+                   erow_ecol: Tuple[int, int], line: str) -> None: ...
+
+CO_GENERATOR = ...  # type: int
+CO_NESTED = ...  # type: int
+CO_NEWLOCALS = ...  # type: int
+CO_NOFREE = ...  # type: int
+CO_OPTIMIZED = ...  # type: int
+CO_VARARGS = ...  # type: int
+CO_VARKEYWORDS = ...  # type: int
+TPFLAGS_IS_ABSTRACT = ...  # type: int
+
 ModuleInfo = NamedTuple('ModuleInfo', [('name', str),
                                        ('suffix', str),
                                        ('mode', str),
@@ -32,6 +52,9 @@ def isgetsetdescriptor(object: object) -> bool: ...
 def ismemberdescriptor(object: object) -> bool: ...
 
 # Retrieving source code
+def findsource(object: object) -> Tuple[List[str], int]: ...
+def getabsfile(object: object) -> str: ...
+def getblock(lines: Sequence[str]) -> Sequence[str]: ...
 def getdoc(object: object) -> str: ...
 def getcomments(object: object) -> str: ...
 def getfile(object: object) -> str: ...
@@ -44,6 +67,7 @@ def getsourcelines(object: object) -> Tuple[List[str], int]: ...
 # or code object"
 def getsource(object: object) -> str: ...
 def cleandoc(doc: str) -> str: ...
+def indentsize(line: str) -> int: ...
 
 # Classes and functions
 def getclasstree(classes: List[type], unique: bool = ...) -> List[
@@ -61,6 +85,12 @@ ArgInfo = NamedTuple('ArgInfo', [('args', List[str]),
                                  ('locals', Dict[str, Any]),
                                  ])
 
+Arguments = NamedTuple('Arguments', [('args', List[Union[str, List[Any]]]),
+                                     ('varargs', Optional[str]),
+                                     ('keywords', Optional[str]),
+                                     ])
+
+def getargs(co: CodeType) -> Arguments: ...
 def getargspec(func: object) -> ArgSpec: ...
 def getargvalues(frame: FrameType) -> ArgInfo: ...
 def formatargspec(args, varargs=..., varkw=..., defaults=...,
@@ -90,7 +120,16 @@ _FrameInfo = Tuple[FrameType, str, int, str, List[str], int]
 def getouterframes(frame: FrameType, context: int = ...) -> List[_FrameInfo]: ...
 def getframeinfo(frame: Union[FrameType, TracebackType], context: int = ...) -> Traceback: ...
 def getinnerframes(traceback: TracebackType, context: int = ...) -> List[_FrameInfo]: ...
+def getlineno(frame: FrameType) -> int: ...
 
 def currentframe(depth: int = ...) -> FrameType: ...
 def stack(context: int = ...) -> List[_FrameInfo]: ...
 def trace(context: int = ...) -> List[_FrameInfo]: ...
+
+Attribute = NamedTuple('Attribute', [('name', str),
+                                     ('kind', str),
+                                     ('defining_class', type),
+                                     ('object', object),
+                                     ])
+
+def classify_class_attrs(cls: type) -> List[Attribute]: ...