1-100所有數字的和

count = 1
sum = 0
while count <= 100:
    sum = sum + count
    count += 1
print(sum)

輸出1-100內的所有奇數

count = 1
num = 0
while count <= 100:
    count += 1
    num += 1
    if num%2 == 0: continue
    else: 
        print(num)

輸出1-100內所有的偶數

count = 1
num = 0
while count <= 100:
    count += 1
    num 
 
+= 1
    if num%2 == 0:
        print(num)

求1-2+3-4+5...99的和

count = 1
num = 1
sum = 0
while count <= 99:
    if num%2 == 0:
        num = -num        #判斷奇數偶數，奇數為正，偶數為負
    else:
        num = num
    sum = sum + num
    count += 1
    num += 1
print(sum)

使用while循環輸入1 2 3 4 5 6 8 9 10

count = 1
num 
 
= 0
while count < 10:
    count += 1
    num += 1
    if num == 7:continue
    else:print(input(‘請輸入數字‘+str(num)))

用戶登錄（三次機會重試）

count = 1
while count <= 3:
    ID = input(‘請輸入賬號:‘)
    Password = input(‘請輸入密碼:‘)
    count += 1
    if ID == ‘關元最帥‘ and Password == ‘無敵帥‘:
        print(‘登陸成功‘)
        
 
break
    elif count <= 3:
        print(‘登陸失敗,還有‘ + str(4-count) + ‘次機會‘)
    else:
        print(‘登陸失敗超過三次‘)

Python練習代碼