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

# _上一次结果

# round四舍五入
round(2.556, 2)

int(2.45)

# 字符串
'HelloWorld'
'Hello\'World'
'Hello"World'
"HelloWorld"
"Hello\"World"
"Hello'World"

# 字符串复制
str1 = str2

# 字符串连接
str1 + str2