How Can I Efficiently Remove Newline Characters When Reading Files in Python?

Eliminating Newlines While Reading File Contents

In Python, readlines() returns a list of strings where each element represents a line from a file. However, these strings inevitably include newline characters (n). To extract data without these newlines, several approaches are available.

Using splitlines()

To split lines without preserving newlines, utilize str.splitlines():

temp = file.read().splitlines()

Stripping Newlines Manually

Alternatively, manually strip newlines using a list comprehension:

temp = [line[:-1] for line in file]

Handling Ending Newlines

Note that this method assumes the file ends with a newline; otherwise, the last line will be incomplete. To address this, explicitly append a newline:

with open(the_file, 'r+') as f:
    f.seek(-1, 2)
    if f.read(1) != '\n':
        # add missing newline if not already present
        f.write('\n')
        f.flush()
        f.seek(0)
    lines = [line[:-1] for line in f]

Omission of Newlines

With the readlines() method, the writelines() method does not add trailing newlines. Hence, f2.writelines(f.readlines()) faithfully replicates f in f2.

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