1.字符串练习：
1.1、http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html
取得校园新闻的编号
str='http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html' print (str[-9:-5]);
1.2、https://docs.python.org/3/library/turtle.html
产生python文档的网址
addr1='https://docs.python.org/3/library/' addr2='.html' addr=addr1+'turtle'+addr2 print (addr);
1.3、http://news.gzcc.cn/html/xiaoyuanxinwen/4.html
产生校园新闻的一系列新闻页网址
for i in range(1,6): print('http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html'.format(str(i)));
1.4、练习字符串内建函数：strip,lstrip,rstrip,split,count
用函数得到校园新闻编号
str="http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1211/8772.html" print(str.split("_",2)[1].rstrip(".html"))
1.5、用函数统计一歌词中单词出现的次数
str='''Wake up in the morning feeling like P Diddy Grab my glasses, out the door ,I'm gonna hit this city Before I leave, brush my teeth with a bottle of Jack Cause when I leave for the night, I aint coming back I'm talkin' pedicure on our toes Trying on all our clothes Boys blowing up our phones Drop-topping, playing our favorite CDs Pulling up to the parties Trying to get a little bit tipsy Oh~ Don't stop, make it pop DJ, blow my speakers up Tonight, Imma fight Till we see the sunlight Tik tok, on the clock But the party don't stop, no Woah-oh oh oh Woah-oh oh oh oh~~ oh~~~~ Aint got a care in world, but got plenty of beer Aint got no money in my pocket But I'm already here And now, the dudes are lining up cause they hear we got swagger But we kick em to the curb unless they look like Mick Jagger Im talking about everybody getting crunk Boys tryna touch my junk Gonna smack him if he getting too drunk, drunk Now, now-we goin til they kick us out Or the police shut us down, Police shut us down, down Po-po shut us down Don't stop, make it pop DJ, blow my speakers up Tonight, Imma fight Till we see the sunlight Tik tok, on the clock But the party don't stop, no Woah-oh oh oh Woah-oh oh oh You build me up You break me down My heart, it pounds Yeah, you got me With my hands up You got me now You got that sound Yeah, you got me You build me up You break me down''' print(str.count("You"))
1.6、将字符串分解成一个个的单词。
str="I belive I can fly" print(str.split())
2.组合数据类型练习
分别定义字符串，列表，元组，字典，集合，并进行遍历。
字符串：
str="Python is the best computer language" for i in range(len(str)): print("序号： ",i+1,str[i])
列表：
list=['Python','best'] for i in list: print("序号：%s 值：%s" % (list.index(i) + 1, i));
元组：
tuple = ('Python','best','language') for i, val in enumerate(tuple): print ("序号：%s 值：%s" % (i + 1, tuple[i]))
字典：
dict = {'Python':6,'best':13,'language':35}
for key in dict:
print(dict[key])
集合：
dom = set(['Python','best','language']) for k in dom: print(k)
总结列表，元组，字典，集合的联系与区别。
列表购物清单，可以重复，类型可以多种。多数使用“[]”表示。
元组结构上与列表相似，但只支持只读，不支持修改。多数使用"()"
字典类似于电话簿，设定的键与值必须是唯一的，如果有重复的键或值，则无法查找到所查找的信息。
集合就是数学的集合，是一个无序互异的序列。
都可以互相转换