SB Character classification

Section 9.19 Character classification

It is often helpful to examine a character and test whether it is upper- or lowercase, or whether it is a character or a digit. The string module provides several constants that are useful for these purposes. One of these, string.digits is equivalent to “0123456789”. It can be used to check if a character is a digit using the in operator.

The string string.ascii_lowercase contains all of the ascii letters that the system considers to be lowercase. Similarly, string.ascii_uppercase contains all of the uppercase letters. string.punctuation comprises all the characters considered to be punctuation. Run the following:

import string print(string.ascii_lowercase) print(string.ascii_uppercase) print(string.digits) print(string.punctuation)

For more information consult the string module documentaiton (see Global Module Index

http://docs.python.org/py3k/py-modindex.html

Note 9.19.1.

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