If条件判断
Python程序语言指定任何非0和非空(null)值为true,0 或者 null为false
多个条件需同时判断时:(and/or的组合使用)
num = 8
# 判断值是否在0~5或者10~15之间:
if (num >= 0 and num <= 5) or (num >= 10 and num <= 15):
print 'hello'
else:
print 'undefine'
参考:http://www.runoob.com/python/python-if-statement.html
举个实际点的例子:
#当用户名为seven 或者是alex,并且密码是123时显示登陆成功
count = 1
while count <= 3:
username = input("uaername:")
password = input('password:')
if (username == 'seven' or username == 'alex') and password == '123':
print('Login success')
break
else:
print('username or password error,pls try again')
count += 1
continue
else:
print('Sorry,you have failed three times,quit! ')
高级用法:多个条件all、any的用法