Problem with Variables

Question

I want to change the global a
Why Error?

a = 4
def func():
print(a)
a += 2
func()

https://code.sololearn.com/cOQ3t7h3DllB/?ref=app

Answer 1

this is yours:
a = 4
def func():
print(a)
a += 2
func()

And this is one of the many right ones:
a = 4
def func(x):
print(x+2)
func(a)

And if you want to affect the variable outside of the function scope, then:
a = 4
def func():
global a
print(a)
a += 2
func()

Answer 2

Insert in func dimension "global a"
https://code.sololearn.com/cjhL2EYSl5j8/?ref=app

Answer 3

a=4
def func(a):
print(a)
a += 2
func(a)

I think 🤔 it's showing an error because you didn't called the argument.

Answer 4

you print the value of a variable that does not exist in the function