I'm learning Python and I've been creating txt files, adding things and rewriting them but I have not been able to modify a specific line, how can I do that? and I also wanted to know how to find out what line a string specifies this, I can already search but I could not make the program discover the line where the string is: |
To search I've uploaded using ...
palavra = input('palavra a pesquisar ')
for line in open('perfil.txt'):
if palavra in line:
print(line)
To replace a certain line in a file, you can use this function:
def alterar_linha(path,index_linha,nova_linha):
with open(path,'r') as f:
texto=f.readlines()
with open(path,'w') as f:
for i in texto:
if texto.index(i)==index_linha:
f.write(nova_linha+'\n')
else:
f.write(i)
Where: path is a string with the name of the file you want to change; index_line is the line number counted from 0; new_line is a string of the contents of the new line.
To find what line a string is on, you can use this function:
def encontrar_string(path,string):
with open(path,'r') as f:
texto=f.readlines()
for i in texto:
if string in i:
print(texto.index(i))
return
print('String não encontrada')
Where string is the string you want to find. Any questions, please comment.