[英]Enumerate two python lists simultaneously?
How do I enumerate two lists of equal length simultaneously?如何同时枚举两个等长的列表? I am sure there must be a more pythonic way to do the following:我确信必须有一种更 Pythonic 的方式来执行以下操作:
for index, value1 in enumerate(data1):
print index, value1 + data2[index]
I want to use the index and data1[index] and data2[index] inside the for loop.我想在 for 循环中使用 index 和 data1[index] 和 data2[index]。
Use zip
for both Python2 and Python3:对 Python2 和 Python3 使用zip
:
for index, (value1, value2) in enumerate(zip(data1, data2)):
print(index, value1 + value2) # for Python 2 use: `print index, value1 + value2` (no braces)
Note that zip
runs only up to the shorter of the two lists(not a problem for equal length lists), but, in case of unequal length lists if you want to traverse the whole list then use itertools.izip_longest
.请注意, zip
仅运行到两个列表中较短的一个(对于等长列表来说不是问题),但是,如果您想遍历整个列表,则在长度不等的列表的情况下,请使用itertools.izip_longest
。
for i, (x, y) in enumerate(zip(data1, data2)):
In Python 2.x, you might want to use itertools.izip
instead of zip
, esp.在 Python 2.x 中,您可能希望使用itertools.izip
而不是zip
,尤其是。 for very long lists.对于很长的列表。
from itertools import count
for index, value1, value2 in zip(count(), data1, data2):
print(index, value1, value2)
Source: http://www.saltycrane.com/blog/2008/04/how-to-use-pythons-enumerate-and-zip-to/#c2603来源: http : //www.saltycrane.com/blog/2008/04/how-to-use-pythons-enumerate-and-zip-to/#c2603
Althought this is not very clear what you look for,虽然这不是很清楚你要找什么,
>>> data1 = [3,4,5,7]
>>> data2 = [4,6,8,9]
>>> for index, value in enumerate(zip(data1, data2)):
print index, value[0]+value[1]
0 7
1 10
2 13
3 16
Since it has been mentioned that the length are equal,既然已经提到长度相等,
for l in range(0, len(a)):
print a[l], b[l]
Suppose you want to use zip
:假设你想使用zip
:
>>> for x in zip([1,2], [3,4]):
... print x
...
(1, 3)
(2, 4)
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