python string.Template 实现$var,${var} ,#var替换，比如接口实现参数化

from string import  Template
import json

class ReplaceTepmlate(Template):
    delimiter ="${}"


def test_example1():
    a={"a":[{"c":1,‘b‘:‘${env}‘},{"c":"${ip}"}]}
    string_text=json.dumps(a)
    # will replace like this {"a": [{"c": 1, "b": "litao"}, {"c": "10"}]}
    print(Template(string_text).substitute({"env":"litao","ip":10}))

class TemplateUserDefine(Template):
    delimiter = ‘$‘


def test_example2():
    """ test $$env replace escape,$$不替换"""

    b={"test":11,‘array‘:{"data":["hello",‘$name‘],"error":{"email":‘$$env‘}}}
    s=json.dumps(b)
    # will not replace $$env it keep self $env
    #{"test": 11, "array": {"data": ["hello", "zhangsan"], "error": {"email": "$env"}}}
    print(TemplateUserDefine(s).substitute({"name":‘zhangsan‘,"env":111}))

class TemplateSpecial(Template):
    delimiter = ‘#‘

def test_example3():
    # test # define variable replace
    test=‘hello,#var,i test args replace instead of kwargs .‘
    ret=TemplateSpecial(test).substitute(var=111)
    # hello,111,i test args replace instead of kwargs .
    print(ret)
if __name__ == ‘__main__‘:
    test_example2()


# 优雅的合并dict

foo=dict(a=1,b=2)
bar=dict(key="value")
# you will get {‘a‘: 1, ‘b‘: 2, ‘key‘: ‘value‘}
print({**foo,**bar})

python string.Template 实现$var,${var} ,#var替换，比如接口实现参数化

原文：https://www.cnblogs.com/SunshineKimi/p/13991763.html