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

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.

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.

Yes, you need to store the value into a file and load it back when the program runs again. This is called program state serialization or persistency.

For a code example:

with open("store.txt",'r') as f: #open a file in the same folder a = f.readlines() #read from file to variable a #use the data read b = int(a[0]) #get integer at first position b = b+1 #increment with open("store.txt",'w') as f: #open same file f.write(str(b)) #writing a assuming it has been changed 

The a variable will I think be a list when using readlines.