You could do it like this:
input_file = open('filename.txt')
output_file = open('output_filename.txt', 'w')
for line in input_file.readlines()[1:]:
output_file.write(line + '\n')
output_file.close()
Same thing using single file:
input_file = open('filename.txt')
input_data = [line for line in input_file.readlines()]
input_file.close()
output_file = open('filename.txt', 'w')
for line in input_data[1:]:
output_file.write(line + '\n')
output_file.close()
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solved How to delete text form txt file using python