Manipulate text files in python

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Manipulate text files in python

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#1 by (2 votes)

1

I know I can not write to a file that I open in read mode, but I wanted to know if I can read the lines of a file that I open to writing, after writing it ?

python

asked by anonymous 09.10.2017 / 15:04

1 answer

list-style does not return to default How to organize JSON content [closed]

score 2 · Answer 1

The file needs to be opened using wr+ mode, which allows read and write operations through the file descriptor,

You can use the seek() method of the descriptor to return the file cursor to the start, see:

lista = ['alpha','beta','gamma','delta']

with open("texto.txt", "wr+") as arq:

    # Grava cada elemento da lista como uma linha no arquivo
    for i in lista:
        arq.write(i + "\n" )

    # Retorna cursosr para o inicio do arquivo
    arq.seek( 0, 0 )

    # Le as linhas do arquivo a partir do
    for linha in arq:
        print(linha.strip())

Output:

alpha
beta
gamma
delta