python 02

n=1
sun=0
while n<=100:
    if n%2==0:
        sum=+n
    n=n+1
print(sum)

while True:
    n= int(input("请输入一个数字:"))
    if n==0:
        break
    sum=+n
print(sum)

range()函数生成数列

nums=range(5)
for i in range(9):           几行
    for i in range(9):       一行几个星星
        print("*",end='')
    print()

等腰三角形

rows=7
for i in range(rows):
    for j in range(rows,i,-1):
        print(' ',end='')
    for k in range(i*2+1):
        print('*',end='')
    print()

for i in range(1,rows-1+1):

    for j in range(i):
        print(' ',end='')
    for k in range((rows-i)*2-1):
        print('*',end='')
    print()