def normalize_signature(sig):
 if isinstance(sig, str):
  parsed = _parse_signature_string(sig)
 else:
  parsed = sig
 if isinstance(parsed, tuple):
  (args, return_type) = (parsed, None)
 elif isinstance(parsed, typing.Signature):
  (args, return_type) = (parsed.args, parsed.return_type)
 else:
  raise TypeError(('invalid signature: %r instance not allowed' % (sig.__class__.__name__,)))
 def check_type(ty):
  if (not isinstance(ty, types.Type)):
   raise TypeError(('invalid signature: expected a type instance, got %r' % (ty,)))
 if (return_type is not None):
  check_type(return_type)
 for ty in args:
  check_type(ty)
 return (args, return_type)

def normalize_signature ( sig ) : if isinstance ( sig , str ) : parsed = _parse_signature_string ( sig ) else : parsed = sig if isinstance ( parsed , tuple ) : ( args , return_type ) = ( parsed , None ) elif isinstance ( parsed , typing . Signature ) : ( args , return_type ) = ( parsed . args , parsed . return_type ) else : raise TypeError ( ( 'invalid signature: %r instance not allowed' % ( sig . __class__ . __name__ , ) ) ) def check_type ( ty ) : if ( not isinstance ( ty , types . Type ) ) : raise TypeError ( ( 'invalid signature: expected a type instance, got %r' % ( ty , ) ) ) if ( return_type is not None ) : check_type ( return_type ) for ty in args : check_type ( ty ) return ( args , return_type )
from *sig* .