Python基本输出语句/输入语句/变量解析
print格式化输出
# -*- coding: utf-8 -*- # print (format(val, 'm,n')) # val:值 format_modifier:输出占位m,精度n print (format(12.3456,'6.2f' )) 12.35 print (format(12.3456,'6.3f' )) 12.346 print (format(12.3456,'6.6f' )) 12.345600 print (format(12.3456,'6.0f' )) 12
print输入语句
input接收的值会转化为字符型,int()可将值转化为整型数据,float()将值转化为浮点型数据
# -*- coding: utf-8 -*- name = raw_input('请输入姓名: ') print name print type(name) age = raw_input('请输入年龄: ') age = int(age) print type(age) age = age + 1 print age weight = float(raw_input('请输入体重: ')) print weight print type(weight) """运行结果""" 请输入姓名: lee lee <type 'str'> 请输入年龄: 13 <type 'int'> 14 请输入体重: 40.22 40.22 <type 'float'>
变量解析
变量改变只改变指向地址不改变指向内容
# -*- coding: utf-8 -*- x = 13 print x, id(x) y = 12 print y, id(y) x = y print x, id(x) z = 13 print z, id(z) """运行结果""" 13 73496064 12 73496076 12 73496076 13 73496064