购物车小程序 | 易学教程

#!/usr/bin/env python

#-*- coding:utf-8 _*-

"""

@author:cjs

@file: shopping.py

@time: 2020/05/27

需求：

1、启动程序后，让用户输入工资，然后打印商品列表

2、允许用户根据商品编号购买商品

3、用户选择商品后，检测余额是否足够，够就直接扣款，不够就提醒

4、可随时退出，退出时，打印已购买商品和余额

字符串所有操作：

#!/usr/bin/env python

#-*- coding:utf-8 _*-

"""

@author:cjs

@file: string.py

@time: 2020/05/28

"""

name = "my name is {name} and my age is {age} years old"

print(name.capitalize()) ###首字母大写

print(name.count("e")) ###计数，有多少个"e"

print(name.center(100,"-")) ###打印100个字符，不够用"-"补齐

print(name.endswith("ex")) ###以ex结尾，如果是则打印True

print(name.expandtabs(tabsize=30)) ###扩展tab健

print(name.find("n")) ###找到字符的索引

print(name.format(name="alex",age=23)) ###字符串格式化

print(name.format_map({'name':"alex","age":12}))

print('ab23'.isalnum()) ###是否包含阿拉伯数字

print("abA".isalpha())

print("1A".isdecimal())

print("1A".isdigit()) ###是否为整数

print("1A".isidentifier()) ###判断是不是一个合法的标识符和变量名

print("33A".isnumeric()) ###检测字符串是否只由数字组成

print(" ".isspace()) ###检测是否为空格

print("My Name Is ".istitle()) ###判断首字母是否为大写

print("My Name Is".isprintable()) ###是否可打印

print("My Name Is".isupper()) ###是否全部为大写

print("-".join(["1","2","3","4"])) ###用符号隔开字符串

print(name.ljust(100,"*")) ###左边不够100字符右边补上

print(name.rjust(100,"-")) ###右边不够100字符左边补上

print("Alex".lower()) ###全部小写

print("Alex".upper()) ###全部大写

print("\nAlex".lstrip()) ###去掉左边空格后回车

print("Alex\n".rstrip()) ###去掉右边空格后回车

print(" Alex ".strip()) ####全掉全部空格后回车

p = str.maketrans("abcdefgh","12345678")

print("alex li".translate(p)) ###加密规则

print("alex li".replace("l","L",1)) ###替换字符串的l字符

print("alex li".rfind("l")) ###从右查找字符的索引

print("1+2+3+4".split("+")) ###提取符号

print("1+2\n+3+4".splitlines())

print("Alex Li".swapcase())

print("lex li".title())

print("lex li".zfill(50)) ###补位

D:\Python3.5.2\python.exe "D:/lesson 14/day2/string.py"

My name is {name} and my age is {age} years old

--------------------------my name is {name} and my age is {age} years old---------------------------

False

my name is {name} and my age is {age} years old

my name is alex and my age is 23 years old

my name is alex and my age is 12 years old

True

False

True

False

1-2-3-4

my name is {name} and my age is {age} years old*****************************************************

-----------------------------------------------------my name is {name} and my age is {age} years old

alex

ALEX

Alex

1l5x li

aLex li

['1', '2', '3', '4']

['1+2', '+3+4']

aLEX lI

Lex Li

00000000000000000000000000000000000000000000lex li

Process finished with exit code 0

来源：oschina

链接：https://my.oschina.net/u/4389538/blog/4294906

标签

python

lex

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