How to increment variable every time script is run in Python?

Question

I have a Python script that I want to increment a global variable every time it is run. Is this possible?

Answer 1

Pretty easy to do with an external file, you can create a function to do that for you so you can use multiple files for multiple vars if needed, although in that case you might want to look into some sort of serialization and store everything in the same file. Here's a simple way to do it:

def get_var_value(filename="varstore.dat"):
    with open(filename, "a+") as f:
        f.seek(0)
        val = int(f.read() or 0) + 1
        f.seek(0)
        f.truncate()
        f.write(str(val))
        return val

your_counter = get_var_value()
print("This script has been run {} times.".format(your_counter))

# This script has been run 1 times
# This script has been run 2 times
# etc.

It will store in varstore.dat by default, but you can use get_var_value("different_store.dat") for a different counter file.

Answer 2

example:-

import os
if not os.path.exists('log.txt'):
    with open('log.txt','w') as f:
        f.write('0')
with open('log.txt','r') as f:
    st = int(f.read())
    st+=1 
with open('log.txt','w') as f:
    f.write(str(st))

Each time you run your script,the value inside log.txt will increment by one.You can make use of it if you need to.