Replicate RawConfigParser.get* methods in SectionProxy

These methods are partially applied (with the section that is being
proxied in SectionProxy) at runtime, so will always be present.

Fixes python#1543.

Author: Daniel Watkins

stdlib/3/configparser.pyi

@@ -100,6 +100,8 @@ class RawConfigParser(_parser):
     def read_dict(self, dictionary: Mapping[str, Mapping[str, Any]],
                   source: str = ...) -> None: ...
 
+    # These get* methods are partially applied (with the same names) in
+    # SectionProxy; the stubs should be kept updated together
     def getint(self, section: str, option: str, *, raw: bool = ..., vars: _section = ..., fallback: int = ...) -> int: ...
 
     def getfloat(self, section: str, option: str, *, raw: bool = ..., vars: _section = ..., fallback: float = ...) -> float: ...
@@ -160,6 +162,13 @@ class SectionProxy(MutableMapping[str, str]):
     @property
     def name(self) -> str: ...
     def get(self, option: str, fallback: Optional[str] = ..., *, raw: bool = ..., vars: Optional[_section] = ..., **kwargs: Any) -> str: ...  # type: ignore
+
+    # These are partially-applied version of the methods with the same names in
+    # RawConfigParser; the stubs should be kept updated together
+    def getint(self, option: str, *, raw: bool = ..., vars: _section = ..., fallback: int = ...) -> int: ...
+    def getfloat(self, option: str, *, raw: bool = ..., vars: _section = ..., fallback: float = ...) -> float: ...
+    def getboolean(self, option: str, *, raw: bool = ..., vars: _section = ..., fallback: bool = ...) -> bool: ...
+
     # SectionProxy can have arbitrary attributes when custon converters are used
     def __getattr__(self, key: str) -> Callable[..., Any]: ...