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invert_text.py
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invert_text.py
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""" Script to reverse a large file line by line in text mode."""
import argparse
def reverse_file_line_by_line(input_file, output_file):
"""
Reverse a large file line by line in text mode.
Args:
input_file: Path to the input file.
output_file: Path to the output file.
"""
with open(input_file, "r", encoding="utf-8") as f_in:
f_in.seek(0, 2) # Go to the end of the file
position = f_in.tell()
current_line = ""
with open(output_file, "w", encoding="utf-8") as f_out:
while position >= 0:
f_in.seek(position)
try:
char = f_in.read(1)
except UnicodeDecodeError:
# In case of a split multi-byte character
position -= 1
continue
if char == "\n":
f_out.write(current_line[::-1] + "\n")
current_line = ""
else:
current_line = char + current_line
position -= 1
# Write the last line if there is one
if current_line:
f_out.write(current_line[::-1])
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description="""Reverse a large file line by line in text mode."""
)
parser.add_argument("input_file", type=str, help="""The input file path.""")
parser.add_argument("output_file", type=str, help="""The output file path.""")
args = parser.parse_args()
reverse_file_line_by_line(args.input_file, args.output_file)