python语句

基本逻辑运算符（if ...elif...else）(0,False,None为假)

flag = False
name = 'luren'
if name == 'python':         # 判断变量否为'python'
    flag = True          # 条件成立时设置标志为真
    print('welcome boss')    # 并输出欢迎信息
else:
    print(name)              # 条件不成立时输出变量名称

num = 5     
if num == 3:            # 判断num的值
    print('boss')        
elif num == 2:
    print('user')
elif num == 1:
    print('worker')
elif num < 0:           # 值小于零时输出
    print('error')
else:
    print('roadman')     # 条件均不成立时输出

num = 9
if num >= 0 and num <= 10:    # 判断值是否在0~10之间
    print('hello')
# 输出结果: hello
 
num = 10
if num < 0 or num > 10:    # 判断值是否在小于0或大于10
    print('hello')
else:
    print('undefine')
# 输出结果: undefine
 
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')
# 输出结果: undefine

age = 16
high = 170
success = True

if age:
    print('ok')
else:
    print('不OK')

if age > 17:
    if success:
        print('咱们结婚吧！')
    else:
        print('去他妈的爱情！')
elif high > 160:
    print('你好高')
else:
    print('不表白')

 score=input('>>: ')
 > 90:优秀
 80 < 90 :良好
 >=60 <80 :合格
 <60:滚犊子


 score = int(input('请输入你的成绩:'))
 if score > 90:
     print('优秀')
 elif score > 80 and score <= 90:
     print('良好')
 elif score >=60 and score < 80:
     print('合格')
 else:
     print('滚犊子')