(line,keyword)
If the first part of line (modulo blanks) matches keyword,
    returns the end of that line. Otherwise returns None
If the first part of line (modulo blanks) matches keyword,
    returns the end of that line. Otherwise returns None
If the first part of line ( modulo blanks ) matches keyword returns the end of that line . Otherwise returns None
def match(line,keyword):
    """If the first part of line (modulo blanks) matches keyword,
    returns the end of that line. Otherwise returns None"""
    line=line.lstrip()
    length=len(keyword)
    if line[:length] == keyword:
        return line[length:]
    else:
        return None
def match ( line , keyword ) : line = line . lstrip ( ) length = len ( keyword ) if line [ : length ] == keyword : return line [ length : ] else : return None