simple Python Template Engine

Pytles.py

#-*- coding: utf8 -*-
from __future__ import print_function

import re


def format(tpl, **vars):
    p = re.compile(r'''\{\{\s*([a-zA-Z0-9_]+?)\s*\}\}''')
    ret, pos = '', 0
    while True:
        match = p.search(tpl, pos)
        if not match:
            ret += tpl[pos:]
            break
        ret += tpl[match.pos: match.start()]
        ret += str(vars.get(match.group(1), ''))
        pos = match.end()
    return ret


tpl = 'hello, {{ name }} ! {{ age }} years old.{{extra}} -- end!'
vars = {'name': 'xuxiang', 'age': 27}
print(format(tpl, **vars))