Eu quero modificar apenas uma linha de um arquivo, algo mais ou menos dessa forma
with open('arquivo.txt', 'r+') as f: for line in f.readlines(): if line == algumacoisa: line.write('textoaqui'); break f.close()
Eu vi em outra pergunta que para fazer isso você deve carregar o arquivo inteiro, modificar ele, e salvar novamente, porem isso não é viável, por que o arquivo tem milhões de linhas, e eu não quero salvar todos os milhões de linhas cada vez que executar a função.
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