python 中的拉链循环

Question

我想创建一个 zip 循环我有 sample.csv 文件，其中包含以下条目：

> 1      2       3     4
> a      b       c     d
> apple  banana  cat   dog

并具有以下代码：

sample= open("sample.csv)
lines = sample.readlines()
testcol = []
for l in lines:
     zipped = zip(testcol ,l)

输出为：

[(('1','a'),'apple'),(('2','b'),'banana'),(('3','c'),'cat'),(('4','d'),'dog')]

但我想要的是：

    [('1','a','apple'),('2','b','banana'),('3','c','cat'),('4','d','dog')]

我必须将它放在循环中的原因是因为我的 sample.csv 可能包含任意数量的行。

Answer 1

这应该可以完成工作：

sample = open("sample.csv)
lines = [line.split() for line in sample.readlines()] #splitting on whitespace to create list of lists
zipped = zip(*lines)

见Unpacking Argument Lists:

The reverse situation occurs when the arguments are already in a list or tuple but need to be unpacked for a function call requiring separate positional arguments. For instance, the built-in range() function expects separate start and stop arguments. If they are not available separately, write the function call with the *-operator to unpack the arguments out of a list or tuple.

python 中的拉链循环

loop of zips in python

zip

for-loop

python-2.7