I have a file that contains a number and i'm using the following code to read the number.

file = open("C:/number.txt")
I want to check if the number is larger than 10000 and if true I want to subtract 100 from the 10000 & write the new number to the original file.
(Or rather than subtract 100 from my 'file' variable then writing the new value to my file, could it be written to the file directly without storing the value in a variable first? Or could someone demenstrate both?)

Then I'd like to write a value to an ini file with the following format. (Obviously creating the ini file if it doesn't exist)

100Removed = True

I have no idea how to do this, Please can anyone help?