条件语句和while循环

#!/usr/bin/env python
# -*- coding:utf8 -*-
age_of_man = 20
if age_of_man >= 18:
    print("成年")
else:
    print("不是成人")

if 条件1:

　　　　缩进的代码块

　　elif 条件2:

　　　　缩进的代码块

　　elif 条件3:

　　　　缩进的代码块

　　......

　　else:　　

　　　　缩进的代码块

#!/usr/bin/env python
# -*- coding:utf8 -*-
score = input(">>: ")
score = int(score)
if score >= 90:
    print("优秀")
elif score >= 80:
    print("良好")
elif score >=60:
    print("合格")
else:
    print("不合格")

while 条件:    
    # 循环体
 
    # 如果条件为真，那么循环体则执行，执行完毕后再次循环，重新判断条件。。。
    # 如果条件为假，那么循环体不执行,循环终止

#打印0到10
#!/usr/bin/env python
# -*- coding:utf8 -*-
count=0
while count <= 10:
    print(count)
    count+=1

#!/usr/bin/env python
# -*- coding:utf8 -*-
while 1 == 1:
    print("ok")

#方法一

count = 1
while count < 11:
    if count == 5:
        pass
    else:
        print(count)
    count = count + 1

#方法二

n = 0
while n < 11:
    if n == 5:
        n = n + 1
        continue
    print(n)
    n = n + 1

count = 1
while count < 101:
    temp = count % 2
    if temp == 0:
        pass
    else:
        print(count)
    count = count + 1

n = 1
s = 0
while n <101:
    s = s + n
    n = n + 1
print(s)

n = 1
s = 0
while n < 100:
    temp = n % 2
    if temp == 0:
        s = s - n
    else:
        s = s + n
    n = n + 1
print(s)

count = 0
while count < 3:
    user = input(‘>>>‘)
    pwd = input(‘>>>‘)
    if user == ‘reese‘ and pwd == ‘123‘:
        print(‘欢迎登陆‘)
        break
    else:
        print(‘用户名或密码错误‘)
    count = count + 1