如何从文本文件中读取' n '行并将其存储在python中的另一个文本文件

Question

我有一个文本文件"file_in.txt">我要读其中的前三行然后写入从"file_in.txt">读取的那三行到一个新文件称为"file_out.txt".

写入后，读取"file_out.txt">并打印它的内容

Answer 1

file_in = "file_in.txt"
file_out = "file_out.txt"
data = ""
# read the first 3 lines of file_in.txt
with open(file_in, 'r') as f:
for i in range(3):
data += f.readline()
# write to file_out.txt
with open(file_out, 'w') as f:
f.write(data)
# read the content of file_out.txt
with open(file_out, 'r') as f:
content = f.read()
print(content)