數(shù)字中整數(shù)與浮點(diǎn)數(shù)的使用，以及將非字符串值轉(zhuǎn)為字符串（使用str()函數(shù)）

#! /usr/bin/env python
# -*- coding:utf-8 -*-

'''
@Author:gcan
@Email:1528667112@qq.com
@Site:http://www.gcan.top
@File:number.py
@Software:PyCharm
@Date:2018-04-10 21:12:45
@Version:1.0.0
'''

# 整數(shù)
# 加減乘除
print(1+2)
print(1-2)
print(1*2)
print(1/2)

# 乘方
print(3**3) #27

# 運(yùn)算次序
print(3*(2+8))

# 浮點(diǎn)數(shù)
# python將帶小數(shù)點(diǎn)的數(shù)都稱為浮點(diǎn)數(shù)

print(0.1+0.2)
print(0.1*0.2)
# 結(jié)果包含的小數(shù)位數(shù)可能是不固定的

# 使用str函數(shù)避免類型錯(cuò)誤
age = 23
# message = "Happy "+age+"rd Birthday"
# print(message)
# 會報(bào)如下錯(cuò)誤
# TypeError: must be str, not int
message = "Happy "+str(age)+"rd Birthday"
print(message)
# str()函數(shù)將非字符串值轉(zhuǎn)為字符串

返回?cái)?shù)據(jù)

3
-1
2
0.5
27
30
0.30000000000000004
0.020000000000000004
Happy 23rd Birthday