Getting "Can only concatenate str (not "int") to str" when adding to a value read from a file

Question

I would like the bots.txt to be read as an int instead of an str. However none of the videos i find on the internet help, or go into major detail on how I can solve this issue.

Here is my code

import time
import os
import random
os.system('mode 88,30')
with open('B://JakraG2//.Bots//bots.txt', 'r') as f:
    aaa = f.read()
counter = aaa
    while True:
    time.sleep(0.05)
    print("Added 1 to bots.txt")
    counter = counter + 1
    lel = "{}".format(counter)
    with open('B://JakraG2//.Bots//bots.txt', 'w') as f:
        f.write("{}".format(lel))

Here is the error

Traceback (most recent call last):
  File "loader.py", line 16, in <module>
    counter = counter + 1
TypeError: can only concatenate str (not "int") to str

bots.txt

IndentationError .... also: counter = int(aaa) and f.write(f"{counter+1}") (get rid of the counter increments and the other interactions with lel etc — Patrick Artner
– Patrick Artner, Commented Aug 15, 2021 at 11:48
If you are sure that text file contains only an integer you can cast it to int before adding 1. counter=int(counter)+1 — quest
– quest, Commented Aug 15, 2021 at 11:52
@LouisCloete When I try that, it gives me this: ValueError: invalid literal for int() with base 10: '' — kelvar
– kelvar, Commented Aug 15, 2021 at 11:52
Then you need to add your file you are reading as a code block in your question so we can see its format. — Louis Cloete
– Louis Cloete, Commented Aug 15, 2021 at 12:01

Lucas García de Viedma Pérez · Accepted Answer · 2021-08-15 12:05:12Z

1

When you read from a file with f.read, the information acquired is determined as a string, which is why when you try to add 1 to counter ( f.e 5 + 1), the program thinks you are trying to do something like this "5" + 1.

A simple fix would be to state that what you read from the file is an integer:

aaa = int(float(f.read()))

edited Aug 15, 2021 at 12:05

answered Aug 15, 2021 at 11:56

Lucas García de Viedma Pérez

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2 Comments

kelvar Over a year ago

aaa = int(f.read()) ValueError: invalid literal for int() with base 10: ''

Lucas García de Viedma Pérez Over a year ago

Would you mind adding to the question the file you are reading? That way we can see the format of its content. However, try with aaa = int(float(f.read())), it might solve the issue.

Patrick Artner · Accepted Answer · 2021-08-15 12:36:41Z

1

File when read are always strings - you need to convert to integer to use integer addition.

import time

# read file 
try:
    with open('bots.txt', 'r') as f:       # you use B://JakraG2//.Bots//bots.txt'
        aaa = f.read().strip()
        counter = int(aaa)
except Exception as e:
    print(e)   # for informational purposes when testing
    counter = 0  # f.e. file not exists or invalid text2number in it

while True:
    time.sleep(0.05)
    print("Added 1 to bots.txt")
    counter = counter + 1
    
    # overwrites existing file
    with open('bots.txt', 'w') as f:       # you use B://JakraG2//.Bots//bots.txt'

        f.write(f"{counter}")

edited Aug 15, 2021 at 12:36

answered Aug 15, 2021 at 11:59

Patrick Artner

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1 Comment

Patrick Artner Over a year ago

@kevlar if you get an IndentationError with this code you copy/pasted something wrong. The code works as is.

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