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string Library

String constants for character classification, matching Python’s string module.

Import

import string

Available Constants

Constant Description
ascii_letters All ASCII letters (a-z, A-Z)
ascii_lowercase Lowercase ASCII letters (a-z)
ascii_uppercase Uppercase ASCII letters (A-Z)
digits Decimal digits (0-9)
hexdigits Hexadecimal digits (0-9, a-f, A-F)
octdigits Octal digits (0-7)
punctuation ASCII punctuation characters
whitespace Whitespace characters

Constants

ascii_letters

Concatenation of ascii_lowercase and ascii_uppercase.

string.ascii_letters  # "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

ascii_lowercase

Lowercase ASCII letters.

string.ascii_lowercase  # "abcdefghijklmnopqrstuvwxyz"

ascii_uppercase

Uppercase ASCII letters.

string.ascii_uppercase  # "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

digits

Decimal digits.

string.digits  # "0123456789"

hexdigits

Hexadecimal digits.

string.hexdigits  # "0123456789abcdefABCDEF"

octdigits

Octal digits.

string.octdigits  # "01234567"

punctuation

ASCII punctuation characters.

string.punctuation  # "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"

whitespace

Whitespace characters.

string.whitespace  # " \t\n\r\v\f"

printable

Combination of digits, letters, punctuation, and whitespace.

string.printable

Examples

Character Validation

import string

def is_valid_identifier(s):
    if len(s) == 0:
        return False
    # First char must be letter or underscore
    if s[0] not in string.ascii_letters + "_":
        return False
    # Rest can include digits
    valid = string.ascii_letters + string.digits + "_"
    for c in s:
        if c not in valid:
            return False
    return True

print(is_valid_identifier("my_var"))   # True
print(is_valid_identifier("123abc"))   # False

Generate Random String

import string
import random

def random_string(length):
    chars = string.ascii_letters + string.digits
    result = ""
    for i in range(length):
        result = result + random.choice(chars)
    return result

print(random_string(10))  # e.g., "aB3xY7mK2p"

Check for Hex String

import string

def is_hex(s):
    for c in s:
        if c not in string.hexdigits:
            return False
    return True

print(is_hex("deadbeef"))  # True
print(is_hex("xyz123"))    # False

Python Compatibility

This module provides the same constants as Python’s string module.