大话Python格式化输出字符串

1."{},{}".format(,)用法总结：

'{0},{1}'.format('var1',132908)
'var1,132908'

'{},{}'.format('var1',132908)
'var1,132908


'{0},{1},{1},{0}'.format('var1',132908)
'var1,132908,132908,var1'

2.关键字参数：

'{name},{age}'.format(age=18,name='wangchao')
'wangchao,18'


class Person:
	def __init__(self,name,age):
		self.name,self.age = name,age
	def __str__(self):
		return 'This book is {self.name},is {self.age} old'.format(self=self)

print Person('wangdage',18)
This book is wangdage,is 18 old


p=['wanghhao',18]
 '{0[0]},{0[1]}'.format(p)
'wanghhao,18'

3."%s"%()形式：

print"I'm %s. I'm %d year old" % ('cobe', 99)
I'm cobe. I'm 99 year old

print "I'm %(name)s. I'm %(age)d year old" % {'name':'coolbe', 'age':99}
I'm coolbe. I'm 99 year old

 总结：

Python中除了内置的%操作符可用于格式化字符串操作，还有"".format()的形式,都需要熟练掌握