Python如何在列表中获得数字的总和,其中也包含字符串 [英] Python how to get sum of numbers in a list that has strings in it as well

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问题描述

我有一个dict,



d = {'a':[4,'Adam',2],'b' [3,'John',4],'c':[4,'Adam',3],'d':[4,'Bill',3],'e':[4,'Bob' 'f':[4,'Joe'],'g':[4,'Bill']}



获得字典中每个列表中的数字总和的方式?



例如, a 应该返回 6 code> b 应该返回 7 ,所以。



目前,我在这样做。

  for d in d:
l2 = []
for d [i]:
如果type(thing)== int:
l2.append(thing)
print sum(l2)

可能需要更快的修复,而不是每次都要经过,并将数字附加到列表中?



谢谢!

解决方案

这是一个相当直接的方式使用字典理解:


$ b $对于k,v在d.items())中,b

  sums = {k:sum(i for v in is ifstat(i,int))

或在Python 2.6及以下版本:

  sums = dict((k,sum(i for v in if ifinstance(i,int)))for k,v in d.items())
/ pre>

示例:

 >>> {k:sum(i for v in if ifinstance(i,int))for k,v in d.items()} 
{'a':6,'c':7,'b' 7,'e':4,'d':7,'g':4,'f':4}


I have a dict,

d = {'a': [4,'Adam', 2], 'b': [3,'John', 4], 'c': [4,'Adam', 3], 'd': [4,'Bill', 3], 'e': [4,'Bob'], 'f': [4, 'Joe'], 'g': [4, 'Bill']}

Is there any quick way to get a sum of the numbers in each of the lists in the dictionary?

For example, a should return 6, b should return 7, so on.

Currently, I am doing this.

for i in d:
    l2=[]
    for thing in d[i]:
        if type(thing) == int:
            l2.append(thing)
        print sum(l2)

Possible for a quicker fix than having to go through each time and append the numbers to a list?

Thanks!

解决方案

Here is a fairly straight forward way using a dictionary comprehension:

sums = {k: sum(i for i in v if isinstance(i, int)) for k, v in d.items()}

Or on Python 2.6 and below:

sums = dict((k, sum(i for i in v if isinstance(i, int))) for k, v in d.items())

Example:

>>> {k: sum(i for i in v if isinstance(i, int)) for k, v in d.items()}
{'a': 6, 'c': 7, 'b': 7, 'e': 4, 'd': 7, 'g': 4, 'f': 4}

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