Local scope of variables in Python

All variables inside a function have a so-called local scope - They are only accessible within their function and cannot be accessed by external code.

Let's say we have a function that contains a variable num:

pythondef func():
  num = 2
  return num

Let's call it and try to print the variable num to the console. After executing the code, an error will be returned because the variable is unknown in the external code:

pythonfunc()
print(num) # will display an error

pythondef func():
  num = 1

func()
print(num)

pythondef func():
  num = 3
  print(num)

func()

pythondef func():
  num = 5
  return num

print(func())

pythondef func():
  num = 7
  return num

func()
print(num)