读取文本文件时，Python程序会额外打印一行空行 [英] Python program prints an extra empty line when reading a text file

问题描述

我正在使用python 3.3.例如，我有一个包含三行文本的文本文件.我想选择一个数字，它将显示该行号的内容.由于某种原因，它会打印我想要的行，并在其下方打印一个空行.

I'm using python 3.3. I have a text file with three lines of text, as an example. I want to select a number and it will display the contents of that line number. For some reason, it prints the line I want, and prints an empty line below it.

文本文件如下所示:

AAPL,Apple,700
P,Pandora,32
MW,Men's Warehouse,54.32

如果我是2，我得到的解释器中的输出:

The output in the interpreter I get if i is 2:

>>
P,Pandora,32

>>

代码在这里:

line_number = int(input('Enter the line number: '))
with open('C:/Python33/myprogramtests/filewrite1.txt') as f:
    i = 1
    for line in f:
        if i == line_number:
            break
        i += 1
    print (line)

我在打印(行)后确实尝试了逗号，但是没有用. 我猜想我丢失了一些只打印该行而不是多余的空白行的代码.

I did try a comma after print (line) but it didn't work. I'm guessing I'm missing some bit of code that would print just the line and not an extra whitespace line.

推荐答案

您应该为print提供end=''，以禁止在输出中添加等价于\n的自动行为.

You should provide an end='' to print to suppress the automatic behaviour of adding the equivalent of \n to output.

我还将删除计数逻辑，并使用islice提取所需的行，例如:

I'd also remove the counting logic and use islice to extract the line you wish, eg:

from itertools import islice

line_number = int(input('Enter the line number: '))
with open('yourfile') as fin:
    print(next(islice(fin, line_number - 1, line_number), ''), end='')

如果要使用计数方法，则可以使用从1开始的enumerate，例如:

If you wanted to use the count approach, then you can use enumerate starting at 1, eg:

for idx, line in enumerate(fin, start=1):
    if idx == line_number:
        print(line, end='')
        break

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