hashlib: make args positional-only before py37

Author: hauntsaninja

stdlib/3/hashlib.pyi

@@ -21,12 +21,20 @@ class _Hash(object):
     def hexdigest(self) -> str: ...
     def update(self, arg: _DataType) -> None: ...
 
-def md5(string: _DataType = ...) -> _Hash: ...
-def sha1(string: _DataType = ...) -> _Hash: ...
-def sha224(string: _DataType = ...) -> _Hash: ...
-def sha256(string: _DataType = ...) -> _Hash: ...
-def sha384(string: _DataType = ...) -> _Hash: ...
-def sha512(string: _DataType = ...) -> _Hash: ...
+if sys.version_info >= (3, 8):
+    def md5(string: _DataType = ...) -> _Hash: ...
+    def sha1(string: _DataType = ...) -> _Hash: ...
+    def sha224(string: _DataType = ...) -> _Hash: ...
+    def sha256(string: _DataType = ...) -> _Hash: ...
+    def sha384(string: _DataType = ...) -> _Hash: ...
+    def sha512(string: _DataType = ...) -> _Hash: ...
+else:
+    def md5(__string: _DataType = ...) -> _Hash: ...
+    def sha1(__string: _DataType = ...) -> _Hash: ...
+    def sha224(__string: _DataType = ...) -> _Hash: ...
+    def sha256(__string: _DataType = ...) -> _Hash: ...
+    def sha384(__string: _DataType = ...) -> _Hash: ...
+    def sha512(__string: _DataType = ...) -> _Hash: ...
 
 def new(name: str, data: _DataType = ...) -> _Hash: ...