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
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!
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 return6
,b
should return7
, 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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