Replacing data in a .txt file in python

Question

I have a file called numbers.txt, where I want my code to replace the number in the file by one. Whenever I run the code though, the final result in the .txt file ends up having no value in the file. When I replace the write function to an append function still end up having no affect on the value of the file. Can someone help please

  numbers = open('numbers.txt', 'r')
  accnumbersign = int(numbers.read())
  accnumbersign += 1
  numbers.close

  
  numbers = open('numbers.txt', 'w')
  numbers.write(str(accnumbersign))
  numbers.close

Asked By: Sirak Vanoostende

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Source

Answer 1

You are not seeing your changes because you are not closing the file properly. Add parenthesis to actually call the function:

numbers.close()

Answered By: wittn

Answer 2

you forgot to add brackets to the close function and you have test to check if the file is empty.
i think i understood the level you’re at, so here’s a code of a basic check before doing the function:

data = open("data.txt", "r")
str_data = data.read()
str_data = str(int(str_data) + 1)
# if there's no data in the file, then make it into 1
if str_data == "":
    str_data = "0"
str_data = str(int(str_data) + 1)
data.close()

data = open("data.txt","w")
data.write(str_data)
data.close()

i’m almost sure you just got an error and didn’t notice it, next time, try printing the content of the file before working with it.

Answered By: ori raisfeld

Answer 3

Better yet, use a context manager

with open('numbers.txt', 'r') as numbers:
    accnumbersign = int(numbers.read())
    accnumbersign += 1

with open('numbers.txt', 'w') as numbers:
    numbers.write(str(accnumbersign))

Answered By: mpopken

Replacing data in a .txt file in python

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