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I am trying to change global value x from within another functions scope as the following code shows,
x = 1
def add_one(x):
x += 1
then I execute the sequence of statements on Python's interactive terminal as follows.
>>> x
1
>>> x += 1
>>> x
2
>>> add_one(x)
>>> x
2
Why is x still 2 and not 3?
935
You can use $INCREMENT on a global variable or a subscript node of a global variable.
Example 3: Changing Global Variable From Inside a Function using global. In the above program, we define c as a global keyword inside the add() function. Then, we increment the variable c by 2, i.e c = c + 2 . After that, we call the add() function.
If you are familiar with other programming languages, such as C++ or Javascript, you may find yourself looking for an increment operator. This operator typically is written as a++ , where the value of a is increased by 1. In Python, however, this operator doesn't exist.
Because x is a local (all function arguments are), not a global, and integers are not mutable.
So x += 1 is the same as x = x + 1, producing a new integer object, and x is rebound to that.
You can mark x a global in the function:
def add_one():
global x
x += 1
There is no point in passing in x as an argument here.
168
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