i=1
sum=0
while i<=20:
if I %2==0:
sum=sum-i
else:
sum=sum+i
i +=1
print (sum)
print("3+6")
sum=0
for i in range(1,11,1) :
sum=sum+i
print( sum)
def add(x,y)/: #定义一个函数,x,y是参数
t=x+y
return t #将结果返回,函数结束
print(add(6,9))
程序运行之后结果是
>>> print("hello","Python World!")
>>> print("hello","Python World!",sep='')
>>> print("hello","Python World!",sep=' ')
>>> print("hello","Python World!",sep=',')
world="world"
print("hello"+world)