# reorder.py
# Walker M. White (wmw2)
# September 2, 2015
"""Functions for reordering a string (complete)"""

def last_name_first(s):
    """Returns: copy of s but in the form <last-name>, <first-name>
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names"""
    first = first_name(s)
    last  = last_name(s)
    return last+', '+first


def first_name(s):
    """Returns: First name in s
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names"""
    end_first = s.find(' ')
    return s[:end_first]


def last_name(s):
    """Return: Last name in s
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names"""
    start = s.rfind(' ')
    return s[start+1:]