Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/@python2/string.pyi

@@ -0,0 +1,68 @@
+from typing import Any, AnyStr, Iterable, List, Mapping, Optional, Sequence, Text, Tuple, Union, overload
+
+ascii_letters: str
+ascii_lowercase: str
+ascii_uppercase: str
+digits: str
+hexdigits: str
+letters: str
+lowercase: str
+octdigits: str
+punctuation: str
+printable: str
+uppercase: str
+whitespace: str
+
+def capwords(s: AnyStr, sep: AnyStr = ...) -> AnyStr: ...
+
+# TODO: originally named 'from'
+def maketrans(_from: str, to: str) -> str: ...
+def atof(s: unicode) -> float: ...
+def atoi(s: unicode, base: int = ...) -> int: ...
+def atol(s: unicode, base: int = ...) -> int: ...
+def capitalize(word: AnyStr) -> AnyStr: ...
+def find(s: unicode, sub: unicode, start: int = ..., end: int = ...) -> int: ...
+def rfind(s: unicode, sub: unicode, start: int = ..., end: int = ...) -> int: ...
+def index(s: unicode, sub: unicode, start: int = ..., end: int = ...) -> int: ...
+def rindex(s: unicode, sub: unicode, start: int = ..., end: int = ...) -> int: ...
+def count(s: unicode, sub: unicode, start: int = ..., end: int = ...) -> int: ...
+def lower(s: AnyStr) -> AnyStr: ...
+def split(s: AnyStr, sep: AnyStr = ..., maxsplit: int = ...) -> List[AnyStr]: ...
+def rsplit(s: AnyStr, sep: AnyStr = ..., maxsplit: int = ...) -> List[AnyStr]: ...
+def splitfields(s: AnyStr, sep: AnyStr = ..., maxsplit: int = ...) -> List[AnyStr]: ...
+def join(words: Iterable[AnyStr], sep: AnyStr = ...) -> AnyStr: ...
+def joinfields(word: Iterable[AnyStr], sep: AnyStr = ...) -> AnyStr: ...
+def lstrip(s: AnyStr, chars: AnyStr = ...) -> AnyStr: ...
+def rstrip(s: AnyStr, chars: AnyStr = ...) -> AnyStr: ...
+def strip(s: AnyStr, chars: AnyStr = ...) -> AnyStr: ...
+def swapcase(s: AnyStr) -> AnyStr: ...
+def translate(s: str, table: str, deletechars: str = ...) -> str: ...
+def upper(s: AnyStr) -> AnyStr: ...
+def ljust(s: AnyStr, width: int, fillchar: AnyStr = ...) -> AnyStr: ...
+def rjust(s: AnyStr, width: int, fillchar: AnyStr = ...) -> AnyStr: ...
+def center(s: AnyStr, width: int, fillchar: AnyStr = ...) -> AnyStr: ...
+def zfill(s: AnyStr, width: int) -> AnyStr: ...
+def replace(s: AnyStr, old: AnyStr, new: AnyStr, maxreplace: int = ...) -> AnyStr: ...
+
+class Template:
+    template: Text
+    def __init__(self, template: Text) -> None: ...
+    @overload
+    def substitute(self, mapping: Union[Mapping[str, str], Mapping[unicode, str]] = ..., **kwds: str) -> str: ...
+    @overload
+    def substitute(self, mapping: Union[Mapping[str, Text], Mapping[unicode, Text]] = ..., **kwds: Text) -> Text: ...
+    @overload
+    def safe_substitute(self, mapping: Union[Mapping[str, str], Mapping[unicode, str]] = ..., **kwds: str) -> str: ...
+    @overload
+    def safe_substitute(self, mapping: Union[Mapping[str, Text], Mapping[unicode, Text]], **kwds: Text) -> Text: ...
+
+# TODO(MichalPokorny): This is probably badly and/or loosely typed.
+class Formatter(object):
+    def format(self, format_string: str, *args, **kwargs) -> str: ...
+    def vformat(self, format_string: str, args: Sequence[Any], kwargs: Mapping[str, Any]) -> str: ...
+    def parse(self, format_string: str) -> Iterable[Tuple[str, str, str, str]]: ...
+    def get_field(self, field_name: str, args: Sequence[Any], kwargs: Mapping[str, Any]) -> Any: ...
+    def get_value(self, key: Union[int, str], args: Sequence[Any], kwargs: Mapping[str, Any]) -> Any: ...
+    def check_unused_args(self, used_args: Sequence[Union[int, str]], args: Sequence[Any], kwargs: Mapping[str, Any]) -> None: ...
+    def format_field(self, value: Any, format_spec: str) -> Any: ...
+    def convert_field(self, value: Any, conversion: str) -> Any: ...