用Python操纵文本文件中的行

Question

我有一个文本文件，带有一些单词，每个单词都在一个单独的行中。我如何创建一个新的文本文件，该文件将原始文件中的每2或3或x行/单词放入一行中？

例如，这是输入：

one
two
three
four
five
six
seven
eight

和我想要的输出：

one two
three four
five six
seven eight

Answer 1

我已经写了这篇文章是为了让您开放。它读取第一个文件" input.txt"，然后将指定数量的行写入新文件'new.txt'。

lines_to_write = 5 #amount of lines to write from old file to new
with open('input.txt') as f:
    data = f.readlines()
with open('new.txt', 'w') as f:
    for x in range(lines_to_write):
        f.write(data[x])

这显示了如何操纵文件，应该是您开始的良好基础。

Answer 2

似乎您希望将一条可变的行写入一行。因此，我写了一个列表理解，将结合了可变的行数。

with open("in.txt","r") as fi, open("out.txt","w") as fo:
    li = fi.readlines()
    inBetween = 2
    fo.write("n".join(" ".join(line.strip() for line in li[i:i+inBetween]) for i in range(0,len(li),inBetween)))

Answer 3

每第二行：

for x in xrange(len(v.splitlines())):
    if x%2 == 0:
        print " ".join(v.splitlines()[x:x+2])

每第三行：

for x in xrange(len(v.splitlines())):
    if x%3 == 0:
        print " ".join(v.splitlines()[x:x+3]

短：

[ " ".join(v.splitlines()[x:x+2]) for x in xrange(len(v.splitlines())) if x%2 == 0 ]
[ " ".join(v.splitlines()[x:x+3]) for x in xrange(len(v.splitlines())) if x%3 == 0 ]

等...