Python！！！！！要用for循环！

def main():
    for i in range(1,5):
        for j in range(4-i):
            print(' ',end=' ')
        for j in range(1,2*i):
            print('*',end=' ')
        print('\n')
    for i in range(1,5):
        for j in range(i-1):
            print(' ',end=' ')
        for j in range(2*(5-i)-1):
            print('*',end=' ')
        print('\n')

main()

def main():
    for i in range(1,5):
        for j in range(4-i):
            print(" ",end=" ")
        for j in range(1,2*i):
            print("*",end=" ")
        print("\n")
    for i in range(4,0,-1):
        for j in range(4-i):
            print(" ",end=" ")
        for j in range(1,2*i):
            print("*", end=" ")
        print("\n")
main()