Python 将多个文件合并到一个新文件中
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merging multiple files in to a new file
提问by Shraddha
I have 2 text files, like ['file1.txt', 'file2.txt']. I want to write a Python script to concatenate these files into a new file, using basic functions like open() to open each file, read line by line by calling f.readline(), and write each line into that new file using f.write(). I am new to file handling programming in python. Can someone help me with this?
我有 2 个文本文件，例如 ['file1.txt', 'file2.txt']。我想编写一个 Python 脚本来将这些文件连接到一个新文件中，使用 open() 等基本函数打开每个文件，通过调用 f.readline() 逐行读取，然后使用 f 将每一行写入该新文件。写（）。我是 Python 中文件处理编程的新手。有人可以帮我弄这个吗？
回答by Maxime Lorant
The response is already here:
回应已经在这里：
filenames = ['file1.txt', 'file2.txt', ...]
with open('result.txt', 'w') as outfile:
for fname in filenames:
with open(fname) as infile:
for line in infile:
outfile.write(line)
Flat line solution
扁线解决方案
What you need (according to comments), is a file with only 2 lines. On the first line, the content of the first file (without break lines) and on the second line, the second file. So, if your files are small (less than ~1MB each, after it can take a lot of memory...)
您需要（根据评论）是一个只有 2 行的文件。第一行是第一个文件的内容（不带换行符），第二行是第二个文件的内容。因此，如果您的文件很小（每个文件小于 ~1MB，之后可能会占用大量内存......）
filenames = ['file1.txt', 'file2.txt', ...]
with open('result.txt', 'w') as outfile:
for fname in filenames:
with open(fname) as infile:
content = infile.read().replace('\n', '')
outfile.write(content)
回答by Hardmath123
f1 = open("file1.txt")
f1_contents = f1.read()
f1.close()
f2 = open("file2.txt")
f2_contents = f2.read()
f2.close()
f3 = open("concatenated.txt", "w") # open in `w` mode to write
f3.write(f1_contents + f2_contents) # concatenate the contents
f3.close()
If you're not particular on Python, the UNIX catcommand does exactly that: concatenates the contents of multiple files.
如果您对 Python 不是特别感兴趣，那么 UNIXcat命令就是这样做的：连接多个文件的内容。
If you want a line break between the two files, change the second-to-last line to have f1_contents + "\n" + f2_contents. (\nmeans new line).
如果要在两个文件之间换行，请将倒数第二行更改为f1_contents + "\n" + f2_contents. （\n表示新行）。
