问题描述
我有这个 tuple 的元组:
TupleOfTuples = ('Venue1','Name1'),('Venue1','Name2'),
('Venue2','Name3'),('Venue3','Name4'),
Venue3','Name5'),('Venue3','Name6'))
转换它得到这样的结果:
输出=(('Venue1',2),('Venue2',1 ),('Venue3',3))
在这种情况下, 包含('Venue1',2),例如,其中 2 的'Venue1'发生在 TupleOfTuples 。
我尝试使用 len()来计算出现次数,但它不工作,因为 TupleOfTuples 不是
如何在Python2.7中做到这一点?方案
使用以计算您的出现次数:
输出= Counter(t [0] for t in TupleOfTuples).items()
$ b b
A Counter()是一个字典,其中键映射到计数;通过传递一个生成器表达式它会做你的计数。因为它是一个字典子类, dict.items()可以用于产生(key,count)$ c $
演示:
只要调用 tuple()>>> from collections import Counter
>>>> TupleOfTuples =((Venue1','Name1'),('Venue1','Name2'),('Venue2','Name3'),'Venue3','Name4' '),('Venue3','Name6'))
>>>> Counter(t [0] for t in TupleOfTuples).items()
[('Venue1',2),('Venue3',3),('Venue2',1)]
I have this tuple of tuples:
TupleOfTuples = (('Venue1', 'Name1'), ('Venue1', 'Name2'), ('Venue2', 'Name3'), ('Venue3', 'Name4'), ('Venue3', 'Name5'), ('Venue3', 'Name6'))
I want to convert it to get a result like this:
Output = (('Venue1', 2), ('Venue2', 1), ('Venue3', 3))
In this case, Output contains ('Venue1', 2), for example, where 2 is the number of times 'Venue1' occurred in TupleOfTuples.
I tried using len() to count the number of occurrences, but it does not work given that TupleOfTuples is not a single tuple but a tuple of tuples.
How can this be done in Python2.7?
Use collections.Counter() to count how many occurrences you have:
from collections import Counter Output = Counter(t[0] for t in TupleOfTuples).items()
A Counter() is a dictionary where keys are mapped to counts; by passing in a generator expression it will do the counting for you. Because it is a dictionary subclass, dict.items() can then be used to produce a list of (key, count) tuples.
This does produce a list; simply call tuple() on that if you insist on having a tuple here.
Demo:
>>> from collections import Counter >>> TupleOfTuples = ( ('Venue1', 'Name1'), ('Venue1', 'Name2'), ('Venue2', 'Name3'), ('Venue3', 'Name4'), ('Venue3', 'Name5'), ('Venue3', 'Name6') ) >>> Counter(t[0] for t in TupleOfTuples).items() [('Venue1', 2), ('Venue3', 3), ('Venue2', 1)]
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