python 分支语句 等值判断 逻辑运算符
发布于2019-08-05 12:10 阅读(1199) 评论(0) 点赞(5) 收藏(0)
# 分支语句
age = 233
if age < 18:
print('您还未满18岁,禁止入内')
elif age > 18 and age < 60:
print("欢迎光临,年龄在18-60之间")
else:
print("欢迎光临，年龄大于60岁")
weight = input('体重(kg): ')
height = input("身高(cm):")
#体重/ 身高的平方 pow(4,2) = 16
bmi = int(weight) / pow(float(height), 2)
print(bmi)
if bmi <= 18.4:
print('偏瘦')
elif bmi > 18.4 and bmi <=23.9:
print('正常')
elif bmi > 23.9 and bmi <= 27.9:
print('过重')
else:
print('肥胖')
# 等值判断
print(1 == 1.0) #True
print(1 == '1') #False
print(1 == int('1')) #True
# 逻辑运算符 优先级 not > and > or
a = 4 > 1 #True
b = 5 < 2 #False
c = 8 == 8 #True
d = 9 < 6 #False
print( a and b) #False
print( a and c) #True
print( a or b) #True
print( d or b) #False
print(not a) #False
print(not b) #True
r1 = a and b or c and not d
# a and b or c and True
# False or True
# True
print(r1) # True
r2 = (a and (not b or c)) and d
# (a and (True or c)) and d
# (a and True) and d
# True and False
# False
print(r2) # False
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链接：https://www.pythonheidong.com/blog/article/4513/61bcd7d7a3f4f8cfecae/
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