How to verify the existence of a file and the number of lines written in Python?

Question

How best to check whether the file is existing and the number of lines inside the file.

Answer 1

You can use the is_file of pathlib.Path to find out if the file exists.

To count the lines, just discover the len of reading the file:

from pathlib import Path

caminho = Path('./arquivo.txt')

if caminho.is_file():
    print('Arquivo existe!')
    with open(caminho, 'r') as f:
        n_linhas = len(f.readlines())
    print('Ele tem {} linhas.'.format(n_linhas))
else:
    print('Arquivo inexistente :(')