Python 3 変数（Global/Local）とオブジェクト・タイプの確認の仕方

◇グローバル変数（Global Variable）

a='abcd'
def func():   
    print('②関数内でアクセス')
    for i in range(3):
        print(a+'③')
        if i%2==0:
            print(a+'CDE')　#④
        else:
            print(a+'123')    #⑤
  
print('a'+'<- ①関数外で変数にアクセス')
func() # func()の実行


実行結果）

a<- ①関数外で変数にアクセス
②関数内でアクセス
abcd③
abcdCDE④
##（For Loop内）
abcd③
abcd123⑤
abcd③
abcdCDE④

◇オブジェクトのisinstance() でチェック。

# Variables of different types
i = 1
f = 0.1
s = "Hell"
l = [0, 1, 2]
d = {0:"Zero", 1:"One"}
t = (0, 1, 2)
b = True
n = None

All of the following return True:

isinstance(i, int)
isinstance(f, float)
isinstance(s, str)
isinstance(l, list)
isinstance(d, dict)
isinstance(t, tuple)

rue and False are an instance of bool, so:
isinstance(b, bool)

What about None? For that, there is always

n is None