Python之路第二天

迷南。 2021-12-14 16:15 283阅读 0赞

python的第一类对象的简易用法：

import math
    
    
    items ={
        'number':42,
        'text':'Hello World'
    }
    items['func_abs'] = abs #内置绝对值函数
    items['mod_math'] = math #内置模块
    items['error'] = ValueError 
    num = [1,2,3,4]
    items['append'] = num.append #添加对象的方法
    print(items)
    print(items['func_abs'](-2))
    print(items['mod_math'].sqrt(4))
    
    输出：
    
    {
         'number': 42, 'text': 'Hello World', 'func_abs': <built-in function abs>, 'mod_math': <module 'math' (built-in)>, 'error': <class 'ValueError'>, 'append': <built-in method append of list object at 0x00000234C1A21148>}
    2
    2.0

line ='gogo,100,20.2'  #把字符串转成带有字段类型的列表
    filed_type = [str,int,float]
    line = line.split(',')
    fileds = [ty(val) for ty,val in zip(filed_type,line)]
    print(fileds)
    输出：

['gogo', 100, 20.2]

字符串的方法：

![1554907-20190331180514620-1913934418.png][]

![1554907-20190331180548096-1018369890.png][]

![1554907-20190331180618155-1033058101.png][]

![loading.gif][]![1554907-20190331180655704-613365013.png][]

#  字典的方法： #

![1554907-20190331180944025-1991914061.png][]

![1554907-20190331181008219-1436489460.png][]

![1554907-20190331181022740-27245576.png][]

转载于:https://www.cnblogs.com/superniao/p/10632389.html

[1554907-20190331180514620-1913934418.png]: /images/20211214/8fb4db36fe824c20b9b8e5e446f3cbab.png
[1554907-20190331180548096-1018369890.png]: /images/20211214/59eb0fa198c84f48833e128258e8eb99.png
[1554907-20190331180618155-1033058101.png]: /images/20211214/451f8918ccff41e496ca6eeed6292049.png
[loading.gif]: https://common.cnblogs.com/images/loading.gif
[1554907-20190331180655704-613365013.png]: /images/20211214/386cdba6eaca4e1485ab1f2994ae38d3.png
[1554907-20190331180944025-1991914061.png]: /images/20211214/5237ba25be7040398e27c9ab738396a9.png
[1554907-20190331181008219-1436489460.png]: /images/20211214/5ea5e833b80b488ab101848883e5947e.png
[1554907-20190331181022740-27245576.png]: /images/20211214/8d94c468fd4a418a8995f2dd0370eac1.png