直角

for i in range(3):
    for j in range(i+1):
         print("*",end="")
    print()

倒直角

for i in range(3):
    for j in range(3-i):
         print("*",end="")
    print()

等腰

for i in range(3):
    for n in range(3-i):
        print(" ",end="")
    for j in range(i+1):
        print("*",end=" ")
    print()

倒等腰

for i in range(3):
    for n in range(i+1):
        print(" ",end="")
    for j in range(3-i):
        print("* ",end="")
    print()

菱形

for i in range(4):  #0,1,2
    for n in range(3-i):  #3,2,1
        print(" ",end="")
    for j in range(i+1):  #1,2,3
        print("* ",end="")
    print()
    #print("* "*(i+1))
for i in range(3):
    for k in range(i+1):  #1,2,3
        print(" ",end="")
    for m in range(3-i):  #3,2,1
        print("* ",end="")
    print()