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string.ascii_lowercase

letters

The string 'abcdefghijklmnopqrstuvwxyz'. string.ascii_uppercase is 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.

Syntax

string.ascii_lowercase  # 'abcdefghijklmnopqrstuvwxyz'
string.ascii_uppercase  # 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

It is an ordinary string, so string.ascii_lowercase.index(ch) gives a letter's alphabet position — the same as ord(ch) - ord('a') but without the magic number, which is the usual trick in Caesar-cipher exercises. Watch out that in on a string tests for a substring, not a single character: 'abc' is True while 'ac' is False even though both letters are in the alphabet.

Examples

import string
print(string.ascii_lowercase)  # → abcdefghijklmnopqrstuvwxyz
print(string.ascii_uppercase)  # → ABCDEFGHIJKLMNOPQRSTUVWXYZ
print(len(string.ascii_lowercase))  # → 26
lower_only = [c for c in 'Hello' if c in string.ascii_lowercase]  # → ['e','l','l','o']
upper_only = [c for c in 'Hello' if c in string.ascii_uppercase]  # → ['H']

See also

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