格式化字符串

#用split分隔字符串
st = 'https://www.taobao.com/market/peishi/shipin.php?spm=a217x.7278569.a214d69.11.73c050a3pItX7C'
print(st.split('/'))

classmate = ['Michael','Bob','Tracy','李三','Tracy']
print(classmate[1])
print(classmate[-1])
print(classmate[1:3])
print(len(classmate))
print(max(classmate))
print(min(classmate))

print(classmate.index('Tracy'))
print(classmate.count('Tracy'))

classmate[1] = 'Sarah'
classmate.sort()
classmate.insert(1,'jack')
classmate.append('Adam')
#list.extend(classmate)
classmate.pop()
classmate.pop(1)

 2、

对taylor歌词进行分词

str = ''
'''open打开歌词数据,加入str'''
with open('d:/style.txt','r') as f:
    for line in f.readlines():
        str += line.strip()
'''用for循环+replace去除标点符号'''
for old in '，,.。？?!！':
    str.replace(old,' ')
str = str.lower()#转换大小写
music = str.split(' ')#按空格划分
dic = {}
#统计词频
for i in set(music):
    dic[i] = music.count(i)
print(dic)