开发中用到的基础知识

 不定长参数传参

def fun(a, b, *args, **kwargs):
    print ("a =", a)
    print ("b =", b)
    print ("args =", args)
    print ("kwargs: ")
    for key, value in kwargs.items():
        print (key, "=", value)

c = [3, 4, 5]  # c = (3,4,5)
d = {"m":6, "n":7, "p":8}
fun(1, 2, *c, **d)

 字符串格式化输出

str =  u'{FromDate}第{FromLession}节{FromSubject}-{FromTeacher}与{ToDate}第{ToLession}节{TosSubject}-{Toteacher}进行调课'.format(**{
    "FromDate": "5月7号",
    "FromLession": '二',
    'FromSubject': "语文",
    "FromTeacher": "张彪",
    "ToDate": "5月8号",
    "ToLession": "三",
    "TosSubject": "数学",
    "Toteacher": "张杨城"
})

 

importlib模块

功能: 主要是用来导入包下面的模块

例如: 导入 xx 包下面的oo.py

在importlib_demo.py的代码如下:

import importlib



# 根据字符串导入模块
# 通畅用来导入包下面的模块
o = importlib.import_module("xx.oo")  # 通常用来导入包下面的模块
s2 = "Person"


# 由字符串找函数、方法、类  利用 反射
the_class = getattr(o, "Person")
p2 = the_class("小黑")
p2.dream()

 

oo.py代码如下:

NAME = "小黑"


class Person(object):
    def __init__(self, name):
        self.name = name

    def dream(self):
        print("{}在做美梦！".format(self.name))