100 Days of Code - Scopes and Number (Day12)

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Scopes and Number

Namespaces : Local vs Global Scope

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enemies = 1

def increase_enemies():
  enemies = 2
  print(f"enemies inside a function {enemies}")
increase_enemies()

print(f"enemies outside a function {enemies}")

Local Scope

Local Scope exists within functions.

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def increase_enemies():
  enemies = 2
  print(f"enemies inside a function {enemies}")
increase_enemies()
print(enemies) # enemies is not defined

Does Python have block scope

There is not such thing as block scope in Python.

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if true :
  new_enemy = 'Skeleton'

print(new_enemy) # 這樣是可以的，因為沒有 block scope

How to modify a Global Variable

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enemies = 1

def increase_enemies():
  global enemies # takes global enemies into the function.
  enemies += 1
  print(f"enemies inside a function {enemies}")

increase_enemies()
print(enemies)

Python Constants and Global Scope

Global constants are variables which you define and you never planning on changing it ever again.
Usually using uppercase to represent it.