Flake8 fixes (#2549)

* Fix over-indented continuation lines

* Fix under-indented continuation lines

* Fix whitespace around default operator problems

* Limit line lengths

* Fix inconsistent files

stdlib/3/email/__init__.pyi

@@ -5,15 +5,10 @@ import sys
 from email.message import Message
 from email.policy import Policy
 
-def message_from_string(s: str, _class: Callable[[], Message] = ..., *,
-                        policy: Policy = ...) -> Message: ...
-def message_from_bytes(s: bytes, _class: Callable[[], Message] = ..., *,
-                       policy: Policy = ...) -> Message: ...
-def message_from_file(fp: IO[str], _class: Callable[[], Message] = ..., *,
-                       policy: Policy = ...) -> Message: ...
-def message_from_binary_file(fp: IO[bytes],
-                             _class: Callable[[], Message] = ..., *,
-                             policy: Policy = ...) -> Message: ...
+def message_from_string(s: str, _class: Callable[[], Message] = ..., *, policy: Policy = ...) -> Message: ...
+def message_from_bytes(s: bytes, _class: Callable[[], Message] = ..., *, policy: Policy = ...) -> Message: ...
+def message_from_file(fp: IO[str], _class: Callable[[], Message] = ..., *, policy: Policy = ...) -> Message: ...
+def message_from_binary_file(fp: IO[bytes], _class: Callable[[], Message] = ..., *, policy: Policy = ...) -> Message: ...
 
 # Names in __all__ with no definition:
 #   base64mime

stdlib/3/email/generator.pyi

@@ -11,7 +11,7 @@ class Generator:
                  maxheaderlen: int = ..., *,
                  policy: Policy = ...) -> None: ...
     def flatten(self, msg: Message, unixfrom: bool = ...,
-                linesep: Optional[str] =...) -> None: ...
+                linesep: Optional[str] = ...) -> None: ...
 
 class BytesGenerator:
     def clone(self, fp: TextIO) -> Generator: ...
@@ -20,7 +20,7 @@ class BytesGenerator:
                  maxheaderlen: int = ..., *,
                  policy: Policy = ...) -> None: ...
     def flatten(self, msg: Message, unixfrom: bool = ...,
-                linesep: Optional[str] =...) -> None: ...
+                linesep: Optional[str] = ...) -> None: ...
 
 class DecodedGenerator(Generator):
     # TODO `fmt` is positional

stdlib/3/email/header.pyi

@@ -20,6 +20,6 @@ class Header:
 
 def decode_header(header: Union[Header, str]) -> List[Tuple[bytes, Optional[str]]]: ...
 def make_header(decoded_seq: List[Tuple[bytes, Optional[str]]],
-                maxlinelen: Optional[int] =...,
+                maxlinelen: Optional[int] = ...,
                 header_name: Optional[str] = ...,
                 continuation_ws: str = ...) -> Header: ...

stdlib/3/email/headerregistry.pyi

@@ -86,7 +86,7 @@ class Address:
     def __init__(self, display_name: str = ...,
                  username: Optional[str] = ...,
                  domain: Optional[str] = ...,
-                 addr_spec: Optional[str]=...) -> None: ...
+                 addr_spec: Optional[str] = ...) -> None: ...
     def __str__(self) -> str: ...
 
 class Group: