Chapter 26
Functional Programming
While primarily thought of and designed as a scripting language, Python
supports several different programming paradigms. This chapter provides an
introduction to functional programming by revisiting a problem from Part II.
Listing 26.1: Word Frequency (Functional Version)
1 # wordfreqfp.py
2
3 import string
4 import itertools
5
6 def removepunc(s):
7 return s.translate(s.maketrans("", "", string.punctuation))
8
9 def getwords(fname):
10 with open(fname) as f:
11 return removepunc(f.read().lower()).split()
12
13 def frequency(words):
14 return list(map(lambda xy: (xy[0], len(list(xy[1]))),
15 itertools.groupby(sorted(words))))
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