Convert a String to a Number.py

# Note: This kata is inspired by Convert a Number to a String!. Try that one 
#       too.
#
# Description
# 
# We need a function that can transform a string into a number. What ways of 
# achieving this do you know?
# 
# Note: Don't worry, all inputs will be strings, and every string is a 
# perfectly valid representation of an integral number.
#
# Examples
# 
# "1234" --> 1234
# "605"  --> 605
# "1405" --> 1405
# "-7" --> -7
def string_to_number(s):
    return int(s)