Python的if else 嵌套 和forin while 循环

bmi = weight/(height*height);
if bmi < 18.5:
    print('过轻')
elif bmi > 18.5 and bmi < 25:
    print('正常')
else:

    print('dd')

for in循环

names = ['Tom','Mak','Jack']
for name in names:
    print(name);
for i in range(1,5):
    print(i)

while 循环

while 1 == 1:  
    print(1);