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token Module

The token module provides token type constants used by Python's tokenizer, representing different syntax elements like operators, keywords, and literals.

Complexity Reference

Operation	Time	Space	Notes
Access token constant	O(1)	O(1)	Module-level constants
tok_name[type]	O(1)	O(1)	Dict lookup for name

Token Type Constants

Using Token Types

import token
import tokenize
import io

code = "x = 1 + 2"

# Tokenize - O(n)
tokens = tokenize.generate_tokens(io.StringIO(code).readline)

for tok in tokens:
    tok_type, tok_string, start, end, line = tok

    # Get token name - O(1)
    tok_name = token.tok_name[tok_type]
    print(f"{tok_name:10} {repr(tok_string)}")

# Output:
# NAME       'x'
# OP         '='
# NUMBER     '1'
# OP         '+'
# NUMBER     '2'
# ENDMARKER  ''

Related Documentation

• tokenize Module
• keyword Module