if语句
a=99
if(a>90):
print('优秀')
else:
print('一般')
a=100
if(a>99):
print('优秀')
elif(a>80):
print('良')
else:
print('一般')
循环
循环有两种：for…in，while
sum = 0
for x in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:
sum = sum + x
print(sum)
sum = 0
while(sum<100):
sum=sum+1
print(sum)