Please answer the following (Programming Language Python):

Test Code: (This is to check if the code that you write as per the requirements above is correct)

The function has this signature: def valid float (number_string) Check whether a string consists only of decimal digits (of any length) and the "-" and "." characters and matches the following requirements. The function returns True if the string is valid, and False otherwise The string must start with a decimal digit or "-". The "-" can only occur as the first character if it appears at all If the first decimal digit is a "O" the next character must be".". The string does not have to include a "." There can be only one "." in the string. If the string includes a "." there must be a string of 1 or more decimal digits before the "." and there must be 1 or more decimal digits after the"." These strings are valid 1234 -1234 12.4 0.6 1234567890.123456789 These strings are +123 123 invalid: 00.6 12-.6335 You may use regular expressions. See