本文介绍了Python中列表排序的方法，包括内置函数sorted()及列表对象的sort()方法，并展示了如何进行多级排序。此外，还讲解了字符串格式化的两种方式，即使用%操作符和str.format()方法。
排序:
3,sorted()
a= [1,2,3,4]
sorted(a,reverse=True)
4,sort()
a.sort(key=int,reverse=True)
5,多级排序
引入模块operator
imporrt operator
>>> a=[(1,2,3),(3,4,5),(0,1,2)]
>>> import operator
>>> a.sort(key=operator.itemgetter(1,2))
>>> a
[(0, 1, 2), (1, 2, 3), (3, 4, 5)]
6,占位符的展示
>>> "i is %s in %s" % ('tom','shanghai')
'i is tom in shanghai'
>>> "%(who)s is a %(gender)s" % {'who':'i','gender':'boy'}
'i is a boy'
>>> "{who} is a {gender}".format(who='i',gender='boy')
'i is a boy'
3,sorted()
a= [1,2,3,4]
sorted(a,reverse=True)
4,sort()
a.sort(key=int,reverse=True)
5,多级排序
引入模块operator
imporrt operator
>>> a=[(1,2,3),(3,4,5),(0,1,2)]
>>> import operator
>>> a.sort(key=operator.itemgetter(1,2))
>>> a
[(0, 1, 2), (1, 2, 3), (3, 4, 5)]
6,占位符的展示
>>> "i is %s in %s" % ('tom','shanghai')
'i is tom in shanghai'
>>> "%(who)s is a %(gender)s" % {'who':'i','gender':'boy'}
'i is a boy'
>>> "{who} is a {gender}".format(who='i',gender='boy')
'i is a boy'
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