[英]Copy from a text file and write to another file the lines numbered
My question is simple. 我的问题很简单。
My task is to read a text file named cities.txt with countries and capitals (eg the first three lines are: 我的任务是读取一个带有国家和大写字母的名为city.txt的文本文件(例如,前三行是:
Aberdeen, Scotland 苏格兰阿伯丁
Adelaide, Australia 澳大利亚阿德莱德
Algiers, Algeria 阿尔及尔,阿尔及利亚
) )
and write to another text file named out.txt these contents numbered (eg 并将这些已编号的内容写入另一个名为out.txt的文本文件中(例如
1: Aberdeen, Scotland 1:苏格兰阿伯丁
2: Adelaide, Australia 2:澳大利亚阿德莱德
3: Algiers, Algeria 3:阿尔及利亚阿尔及尔
) )
My code so far is: 到目前为止,我的代码是:
try: with open('cities.txt', 'r') as f: with open('out.txt', 'w') as m: lines = f.read() #missing code except: print('Error') else: with open('out.txt', 'r') as m: content = m.read() print(content)
Any ideas? 有任何想法吗?
You could do it, like so: 您可以这样做,就像这样:
with open('cities.txt') as infile, open('out.txt', 'w') as outfile:
in_lines = infile.readlines()
for i, line in enumerate(in_lines, start=1):
outfile.write('{}: {}'.format(i, line))
The text written to the out.txt
: 写入out.txt
的文本:
1: Aberdeen, Scotland
2: Adelaide, Australia
3: Algiers, Algeria
You just need to loop over each line in the input file and write to the output - and use a counter to keep track of the line number: 您只需要遍历输入文件中的每一行并写入输出-并使用计数器来跟踪行号:
with open('cities.txt', 'r') as f:
with open('out.txt', 'w') as m:
l = 1
for line in f:
m.write("{}: {}".format(l, line))
l += 1
You can keep it short by opening the files on one line 您可以通过在一行上打开文件来使其简短
with open(r'bla.txt', 'r') as fd, open(r'bla2.txt', 'w') as fd2:
count = 1
for line in fd.readlines():
fd2.write(str(count) + ': ' + line)
count += 1
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