import re

def is_name(text):
    '''Return whether text is a valid first and last name with 
    an optional middle initial.'''
    return re.search(r'^\w+ (\d\.)? \w+$', text) != None


def extract_parts(float_str):
    '''Given a string representing a float, return a 2-tuple
    of the whole and fractional parts.'''
    match = re.search(r'^(-?\d+)(\.\d+)?$', float_str)
    return (match.group(1), match.group(2))


def find_long_words(filename):
    '''Print all words in filename that are at least 15 characters long.'''
    input_file = open(filename, 'r')
    source_string = input_file.read().lower()
    input_file.close()
    words = re.findall('[a-zA-Z]{15,}', source_string)
    for word in words:
        print(word)
        
        
def print_comments(filename):
    '''Print all the non-docstring comments in a Python program.'''
    input_file = open(filename, 'r')
    # this is a comment with a 
    comments = [] # list of all the comments
    for line in input_file:
        line = line.strip()
        match = re.search(r'#([^"\']*)$', line)
        if match != None:
            # yes, there is a comment on this line
            comments.append(match.group(1))
    input_file.close()
    for comment in comments: # print out all the comments
        print(comment)