(self, file=None)
print_usage(file : file = stdout)

        Print the usage message for the current program (self.usage) to
        'file' (default stdout).  Any occurrence of the string "%prog" in
        self.usage is replaced with the name of the current program
        (basename of sys.argv[0]).  Does nothing if self.usage is empty
        or not defined.
print_usage(file : file = stdout)
print_usage ( file : file = stdout )
def print_usage(self, file=None):
        """print_usage(file : file = stdout)

        Print the usage message for the current program (self.usage) to
        'file' (default stdout).  Any occurrence of the string "%prog" in
        self.usage is replaced with the name of the current program
        (basename of sys.argv[0]).  Does nothing if self.usage is empty
        or not defined.
        """
        if self.usage:
            print(self.get_usage(), file=file)
def print_usage ( self , file = None ) : if self . usage : print ( self . get_usage ( ) , file = file )