pyth习题

模式A：

for n in range(1,7):
    for i in range(1,n+1):
        print(i,end=" ")
    print()

模式B：

for n in range(7, 0, -1):
    for i in range(1, n):
        print(i, end=" ")
    print()

模式C：

for n in range(1, 7):
    for i in range(6 - n, 0, -1):
        print(" ", end=" ")
    for i in range(n, 0, -1):
        print(i, end=" ")
    print()

模式D：

for n in range(1, 7):
    for i in range(1, n):
        print(" ", end=" ")
    for i in range(1, 8 - n):
        print(i, end=" ")
    print()

for n in range(0, 8):
    for i in range(8 - n, 1, -1):
        print(" ", end="    ")
    for i in range(n + 1):
        if 2 ** i >= 10 and 2 ** i < 100:
            print(2 ** i, end="   ")
        elif 2 ** i >= 100:
            print(2 ** i, end="  ")
        else:
            print(2 ** i, end="    ")
    for i in range(n - 1, -1, -1):
        if 2 ** i >= 10 and 2 ** i < 100:
            print(2 ** i, end="   ")
        elif 2 ** i >= 100:
            print(2 ** i, end="  ")
        else:
            print(2 ** i, end="    ")
    print()