What does .readlines()[:5] mean when File I/O and what does sourcefile/targetfile mean

First, the code is as follows

SourceFile = open("example_dir/lipsum/lipsum.txt", "r")
TargetFile = open("copied.txt", "w")

for line in SourceFile.readlines()[:5]:
     TargetFile.write(line)

TargetFile.close()
SourceFile.close()

less copied.txt

It's like this.

I wonder what happens if I turn on the source file in reading mode and write a target file on it.

And does .readlines()[:5] mean getting 5 lines from the source file? I don't even know the meaning of TargetFile.write(line)

file txt

2023-06-13 10:55

1 Answers

I wonder what happens if I turn on the source file in reading mode and write a target file on it.

It doesn't matter if the order changes because it's just a simple file opening.

And does .readlines()[:5] mean getting 5 lines from the source file? I don't even know the meaning of TargetFile.write(line)

SourceFile.readlines()[:5] reads the entire line of the file and imports only the first five lines.

In for line in multiple lines, line means one line of multiple lines, so TargetFile.write(line) means to save one line at a time.

2023-06-24 21:44

If you have any answers or tips

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