Python中格式化format()方法详解

# -*- coding: utf-8 -*- 
 
#==================== 
#File: abop.py 
#Author: Wendy 
#Date: 2013-12-03 
#==================== 
 
#eclipse pydev, python3.3 
 
age = 25 
name = 'Caroline' 
 
print('{0} is {1} years old. '.format(name, age)) #输出参数 
print('{0} is a girl. '.format(name)) 
print('{0:.3} is a decimal. '.format(1/3)) #小数点后三位 
print('{0:_^11} is a 11 length. '.format(name)) #使用_补齐空位 
print('{first} is as {second}. '.format(first=name, second='Wendy')) #别名替换 
print('My name is {0.name}'.format(open('out.txt', 'w'))) #调用方法 
print('My name is {0:8}.'.format('Fred')) #指定宽度 

Caroline is 25 years old.  
Caroline is a girl.  
0.333 is a decimal.  
_Caroline__ is a 11 length.  
Caroline is as Wendy.  
My name is out.txt 
My name is Fred  .