组合数据类型练习，英文词频统计实例

Posted 2020-10-07 ELsky

1、由字符串创建一个作业评分表，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分的同学有几个，3分的同学有几个，增删改查等等。

>>> fenshu = list(\'1213223131312232323\')
>>> fenshu
[\'1\', \'2\', \'1\', \'3\', \'2\', \'2\', \'3\', \'1\', \'3\', \'1\', \'3\', \'1\', \'2\', \'2\', \'3\', \'2\', \'3\', \'2\', \'3\']
>>> fenshu.index(\'3\')
3
>>> fenshu.count(\'1\')
5
>>> fenshu.count(\'3\')
7
>>> fenshu.append(\'1\')
>>> fenshu
[\'1\', \'2\', \'1\', \'3\', \'2\', \'2\', \'3\', \'1\', \'3\', \'1\', \'3\', \'1\', \'2\', \'2\', \'3\', \'2\', \'3\', \'2\', \'3\', \'1\']
>>> fenshu.insert(1,\'3\')
>>> fenshu
[\'1\', \'3\', \'2\', \'1\', \'3\', \'2\', \'2\', \'3\', \'1\', \'3\', \'1\', \'3\', \'1\', \'2\', \'2\', \'3\', \'2\', \'3\', \'2\', \'3\', \'1\']
>>> fenshu.pop()
\'1\'
>>> fenshu.pop(3)
\'1\'
>>> fenshu
[\'1\', \'3\', \'2\', \'3\', \'2\', \'2\', \'3\', \'1\', \'3\', \'1\', \'3\', \'1\', \'2\', \'2\', \'3\', \'2\', \'3\', \'2\', \'3\']
>>> 

2、字典实例：建立学生学号成绩字典，做增删改查遍历操作。

>>> k={\'201406114326\':\'3\',\'201406114327\':\'2\',\'201406114328\':\'1\',\'201406114329\':\'0\'}
>>> k[\'201406114326\']
\'3\'
>>> k.pop(\'201406114327\')
\'2\'
>>> k
{\'201406114326\': \'3\', \'201406114328\': \'1\', \'201406114329\': \'0\'}
>>> k.keys()
dict_keys([\'201406114326\', \'201406114328\', \'201406114329\'])
>>> k.values()
dict_values([\'3\', \'1\', \'0\'])
>>> k.items()
dict_items([(\'201406114326\', \'3\'), (\'201406114328\', \'1\'), (\'201406114329\', \'0\')])
>>> k.get(\'201406114326\')
\'3\'
>>> k.get(\'201406114327\',\'无结果\')
\'无结果\'
>>> 

 3、列表，元组，字典，集合的遍历，总结列表，元组，字典，集合的联系与区别。

>>> fenshu=list(\'32123123123\')
>>> zd=tuple(\'32123123123\')
>>> k={\'201406114326\':\'3\',\'201406114327\':\'2\',\'201406114328\':\'1\',\'201406114329\':\'0\'}
>>> s=set(\'32123123123\')
>>> fenshu
[\'3\', \'2\', \'1\', \'2\', \'3\', \'1\', \'2\', \'3\', \'1\', \'2\', \'3\']
>>> zd
(\'3\', \'2\', \'1\', \'2\', \'3\', \'1\', \'2\', \'3\', \'1\', \'2\', \'3\')
>>> k
{\'201406114326\': \'3\', \'201406114327\': \'2\', \'201406114328\': \'1\', \'201406114329\': \'0\'}
>>> s
{\'3\', \'2\', \'1\'}
>>> for i in fenshu:
    print(i,end=\'\')

    
32123123123
>>> for i in zd:
    print(i,end=\'\')

    
32123123123
>>> for i in k:
    print(i)

    
201406114326
201406114327
201406114328
201406114329
>>> for i in s:
    print(i)

    
3
2
1
>>> 

 4.词频统计

news=\'\'\'My father was a self-taught mandolin player.
He was one of the best string instrument players in our town.
He could not read music, but if he heard a tune a few times,
he could play it. When he was younger, he was a member of a small
country music band. They would play at local dances and on a few occasions
would play for the local radio station. He often told us how he had
auditioned and earned a position in a band that featured Patsy Cline as
their lead singer. He told the family that after he was hired he never
went back. Dad was a very religious man. He stated that there was a lot of
drinking and cursing the day of his audition and he did not
want to be around that type of environment. \'\'\'
news=news.lower()
for i in \',.\':
    news=news.replace(i,\' \')
words=news.split(\' \')
dict={}
keys=set(words)
for i in words:
    dict[i]=words.count(i)
count=list(dict.items())

count.sort(key=lambda x:x[1],reverse=True)
for i in range(10):
    print(count[i])