1 - Python 概述和基本知识

1. 输入输出

print("Hello World!","Python","...")
var = input("Enter a string:")
num1,num2 = eval(input("Enter two number:"))

2. 同时赋值

x, y = y, x   %交换 x 和 y 的值

3. 代码换行

sum = 1 + 2 + 3 + 4 + 5 \
\+ 6 + 7

4. 基本数学运算

+

-

*

/

//

**

%

=

+=

-=

*=

/=

//=

%=

**=

5.类型转换和四舍五入

value = 5.6
int(value)  %转为整数
round(value) %四舍五入
str(value)   %转成字符串

6. 显示当前时间

import time
currentTime = time.time()      #返回时间戳
totalSeconds = int(currentTime)
currentSecond = totalSeconds % 60
totalMinutes = totalSeconds // 60
currentMinute = totalMinutes % 60
totalHours = totalMinutes // 60
currentHour = totalHours % 24
print("Current time is " + str(currentHour) + ":" + str(currentMinute) + ":" + str(currentSecond) + " GMT")  #类型转换