#!/usr/bin/env python3.7
# function

# pow(2, 3) === 2 ** 3 == 2的3次方

# abs(-10) 取正

# print(round(2 / 3))
# 2.7 ==> 0.0
# 3.7 ==> 1


# import math

# print(math.floor(32.9)) # 32  向下取整
# or
# int(32.9) # 32

# math.ceil(32.3) # 33 向上取整
# math.ceil(32) # 32

# math.sqrt(9)  # 3.0 计算平方根

# name = input("What is your name? ")
# print("Hello, " + name + "!")


# print(str("Hello,\nworld!"))
# input("Press <enter>")

# from turtle import *
# forward(100)
# left(120)
# forward(100)
# left(120)
# forward(100)


# print(r'C:\Program Files\foo\bar' '\\')
# print(r'C:\nowhere')
# print('C:\nowhere')
# print('\u00C6')
# print('\U0001F60A')
# print('\N{cat}')


# 编码转换
# print(len("Hello, world!".encode("ASCII"))) # 13
# print(len("Hello, world!".encode("UTF-8"))) # 13
# print(len("Hello, world!".encode("UTF-32"))) # 56

print(help('sys'))