python的基础知识

1.字符串格式化输出

& 占位符

声明占位的类型：%s （字符串） %d/%i(整型) %%（转义成为普通的%

%（）不能多。不能少 一一对应

f"{}"大括号里的内容一般都放变量 字符串单引号

3.6版本级以上才能使用

例如:

name=input("输入名字:")
age=input("输入年龄:")
print("我的名字叫%s,我的年龄是%s"%(name,age))
### 注意占位符和 %
​
msg = f"""
------------------- info ----------------------
name: {input("name:")}
age: {input("age:")}
sex : {input("sex:")}
job: {input("job:")}
hobby: {input("hobby:")}
------------------- end ------------------------
"""
​
# a = "------------------- info ----------------------"
# b = "name:"
# c = "age:"
# d = "sex:"
# e = "job:"
# f = "hobby:"
# g = "------------------- end ------------------------"
#
# name = input('name:')
# # age = input('age:')
# # sex = input('sex:')
# # job = input('job:')
# # hobby = input('hobby:')
# #
# # print(a + '
' + b + name + '
' + c + age + '
' + d + sex + '
' + e + job + '
'
# #       + f + hobby + '
' + g
#       )
msg = f"""
------------------- info ----------------------
name: {input("name:")}
age: {input("age:")}
sex : {input("sex:")}
job: {input("job:")}
hobby: {input("hobby:")}
------------------- end ------------------------
​
print(msg)
"""
​
​
msg = '''
------------------- info ----------------------
name: %s
age: %s
sex : %s
job: %s
hobby: %s
------------------- end ------------------------
'''
​
# print(msg%('alex','20','nan','it','cnb'))
​
​

4.编码

成员运算符:in在 not in 不在

比较运算符 :== != > < <= >=

and or not

逻辑运算符

复制运算符:= += -= *= /= **= %= //=

算术运算符: + - * / % ** //

3.运算符

continue 跳出本次循环,继续下次循环.(伪装成循环体中最后一行)

break 终止当前的循环

条件终止循环

循环体

while 关键字 条件: (死循环)

2.while 循环