［python］format的使用

举例1：  使用{i}指定取哪个参数

>>> name="lucy">>> age=18>>> print "This is {0}, aged {1}".format(name, age)      This is lucy, aged 18

{0}表示取第0个参数,{1}取第1个参数，分别对应name，age变量的值,从下例感受一下：
>>> print "This is {1}, aged {1}".format(name, age)    This is 18, aged 18
>>> print "This is {0}, aged {0}".format(name, age)This is lucy, aged lucy

举例2：   使用{key}指定取哪个参数

>>> print "This is {name}, aged {age}".format(name='lily', age=10)     第一个key是name，后面对这个key赋值This is lily, aged 10