mapM and mapM_ in Python

mapM.py

# open 0.txt, 2.txt, ..., 9.txt

# list comprehension
fs = [open('{0}.txt'.format(i)) for i in range(10)]
[f.close() for f in fs]

# map
fs = map(lambda i: open('{0}.txt'.format(i)), range(10))
map(lambda f: f.close(), fs)

# for loop
fs = []
for i in range(10):
    fs.append(open('{0}.txt'.format(i)))
for f in fs:
    f.close()