<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def kwargstr(self):
		'''Concatenate keyword arguments into a string.'''
		temp = [' [--' + k + (' ' + str(v) if v is not False else '') + ']' for k, v in self.defaults.items()]
		return ''.join(temp)