# 條件判斷

# 1
print("#1")
age = 20
if age >= 18:
    print(‘your age is‘, age)
    print(‘adult‘)
print("---------------------")

# 2
print("#2")
age = 3
if age >= 18:
    print(‘your age is‘, age)
    print(‘adult‘)
else:
    print(‘your age is‘, age)
    print(‘teenager‘)
print("---------------------")

# 3
print("#3")
age = 3
if age >= 18:
    print(‘adult‘)
elif age >= 6:
    print(‘teenager‘)
else:
    print(‘kid‘)
print("---------------------")

# 4
print("#4")
s = input(‘birth: ‘)
# input返回的數據類型是str,不能直接和整數比較,用int()強轉
# 當然如果輸入類似‘abc‘這種非數字時，需要捕獲程序運行期的錯誤,這裏不展開討論
birth = int(s)
if birth < 2000:
    print(‘00前‘)
else:
    print(‘00後‘)
print("---------------------")

Python中的條件判斷