!= 是個比較運算符號『不等於』。
>>> a = 5
>>> 5 != a
False
>>> "Coscell" != "coscell"
True
最常用於條件判斷和迴圈。
# 密碼檢測
password = 'p123'
check = input("請輸入密碼: ")
if check != password:
print("密碼錯誤")
# 倒計時
import time
n = 10
while n != 0:
print("\a")
print(n)
n -= 1
time.sleep(1)