标签:src blog nes 种类型 包括 ext ima .com was
1.实例: 下载一首英文的歌词或文章,将所有,.?!等替换为空格,将所有大写转换为小写,统计某几个单词出现的次数,分隔出一个一个的单词。
str=‘‘‘Look how they shine for you,
And everything you do,
Yeah, they were all Yellow.
I came along,
I wrote a song for you,
And all the things you do,
And it was called Yellow.
So then I took my turn,
Oh what a thing to have done,
And it was all Yellow.
Your skin
Oh yeah, your skin and bones,
Turn into something beautiful,
You know, you know I love you so,
You know I love you so.
I swam across,
I jumped across for you,
Oh what a thing to do.
Cos you were all Yellow,
I drew a line,
I drew a line for you,
Oh what a thing to do,
And it was all Yellow.‘‘‘
str=str.lower()
for i in ‘,.‘:
str=str.replace(i,‘ ‘)
str=str.split(‘ ‘)
print(str)
2.列表实例:由字符串创建一个作业评分列表,做增删改查询统计遍历操作。例如,查询第一个3分的下标,统计1分的同学有多少个,3分的同学有多少个等。
lb = list(‘1324864532‘)
print(lb)
for i in range(len(lb)):
lb[i]=int(lb[i])
print(lb.index(3))
print(lb.count(1))
print(lb.count(3))
lb.insert(1,9)
lb.pop(2)
lb.sort()
print(lb)
3.简要描述列表与元组的异同。
列表是处理一组有序项目的数据结构,即你可以在一个列表中存储一个序列的项目。
列表中的项目。列表中的项目应该包括在方括号中,由于你可以增加或删除项目,我们说列表是可变的数据类型,即
这种类型是可以被改变的。列表是可以嵌套的。
元组和列表十分相似,不过元组是不可变的。即你不能修改元组。元组通过圆括号中用逗号分隔的项目定义。
元组也是可以嵌套的。
标签:src blog nes 种类型 包括 ext ima .com was
原文地址:http://www.cnblogs.com/yishhaoo/p/7562098.html