Learn Web Development with Python

Manipulating files and directories

Let's see a couple of quick examples on how to manipulate files and directories. The first example manipulates the content:

# files/manipulation.pyfrom collections import Counterfrom string import ascii_letterschars = ascii_letters + ' 'def sanitize(s, chars):    return ''.join(c for c in s if c in chars)def reverse(s):    return s[::-1]with open('fear.txt') as stream:    lines = [line.rstrip() for line in stream]with open('raef.txt', 'w') as stream:    stream.write('\n'.join(reverse(line) for line in lines))# now we can calculate some statisticslines = [sanitize(line, chars) for line in lines]whole = ' '.join(lines)cnt = Counter(whole.lower().split())print(cnt.most_common(3))

The previous example defines two functions:  ...