@staticmethod<EOL><INDENT>def random_string(length=<NUM_LIT:15>):<DEDENT>
rand_str = '<STR_LIT>'<EOL>for letter in range(length):<EOL><INDENT>rand_str += random.choice('<STR_LIT>' +string.digits)<EOL><DEDENT>return rand_str<EOL>
Generate a random string of specified length.