What is the ascii_letters constant in Python?

The string module

The string module in Python is a collection of different constants.

The ascii_letters constant

The ascii_letters constant in the string module contains all the English letters from a to z. These letters are in lowercase and uppercase as a single string.

The value of the constant is as follows:

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

Syntax

string.ascii_letters

Since ascii_letters is a constant, we can access it via the string module.

Let’s look at two code examples that use the ascii_letters constant.

Example 1

Explanation

• Line 1: We import the string module.

• Line 3: We store the output of string.ascii_letters in the ascii_letters_output variable.

• Line 5: We print the ascii_letters_output variable.

Example 2

Explanation

• Line 1: We import the string module.

• Lines 3–9: We define a function called is_ascii_letters_only that accepts a string as its parameter and checks whether this string contains only ASCII letters.

• Line 11: We define a string called str_to_check_1 that contains only ASCII letters.

• Line 12: We invoke the is_ascii_letters_only function by passing str_to_check_1 as the parameter.

• Line 14: We define a string called str_to_check_2 that contains digits and ASCII letters.

• Line 15: The is_ascii_letters_only function is invoked passing str_to_check_2 as the parameter.