摘要：條件語(yǔ)句例條件應(yīng)用請(qǐng)輸入用戶名請(qǐng)輸入密碼歡迎登陸用戶名或密碼錯(cuò)誤例條件條件應(yīng)用請(qǐng)輸入你的性別男傻，自己性別都忘了女你在想想，你忘了你已經(jīng)做了手術(shù)了嗎人妖循環(huán)語(yǔ)句條件開(kāi)始下一次循環(huán)跳出所有循環(huán)例請(qǐng)輸入用戶名請(qǐng)輸入
1 條件語(yǔ)句
例1：
if 條件:
...
else:
...
應(yīng)用
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
username = input("請(qǐng)輸入用戶名：")
password = input("請(qǐng)輸入密碼：")
if username == "fcc" and password == "123":
print("歡迎登陸！")
else:
print("用戶名或密碼錯(cuò)誤！")
例2:
if 條件：
...
elif 條件:
...
else:
...
應(yīng)用：
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
sex = input("請(qǐng)輸入你的性別：")
if sex == "男":
print("傻x，自己性別都忘了!")
elif sex == "女":
print("...你在想想，你忘了你已經(jīng)做了手術(shù)了嗎...")
else:
print("人妖.......")
2 循環(huán)語(yǔ)句
while
while 條件:
continue # 開(kāi)始下一次循環(huán)
break # 跳出所有循環(huán)
例：
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 0
while i < 3:
username = input("請(qǐng)輸入用戶名：")
password = input("請(qǐng)輸入密碼：")
if username == "fcc" and password == "123":
print("歡迎登陸！")
break
else:
print("用戶名或密碼錯(cuò)誤")
i += 1
3 練習(xí)
使用while循環(huán)輸入 1 2 3 4 5 6 8 9 10
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 1
while True:
if i == 7:
i += 1
continue
print(i)
i += 1
if i == 11:
break
求1-100的所有數(shù)的和
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
value = 0
i = 1
while i < 101:
value = value + i
i += 1
print(value)
輸出 1-100 內(nèi)的所有奇數(shù)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 1
while i < 101:
if i % 2 == 1:
print(i)
i += 1
輸出 1-100 內(nèi)的所有偶數(shù)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 1
while i < 101:
if i % 2 == 0:
print(i)
i += 1
求1-2+3-4+5 ... 99的所有數(shù)的和
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
value = 0
i = 1
while i < 100:
if i % 2 == 1:
value = value + i
i += 1
elif i % 2 == 0:
value = value - i
i +=1
print(value)
用戶登陸（三次機(jī)會(huì)重試）
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:Chuncheng.Fan
i = 0
while i < 3:
username = input("請(qǐng)輸入用戶名：")
password = input("請(qǐng)輸入密碼：")
if username == "fcc" and password == "123":
print("歡迎登陸！")
break
else:
print("用戶名或密碼錯(cuò)誤")
i += 1
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