编写程序，输出斐波那契数列的前20项，要求每行输出5项。

Sure, here's the code to output the first 20 Fibonacci numbers with 5 numbers per line:

a, b = 0, 1
for i in range(20):
    print(b, end=' ')
    a, b = b, a + b
    if (i + 1) % 5 == 0:
        print()

This will output:

1 1 2 3 5 
8 13 21 34 55 
89 144 233 377 610 
987 1597 2584 4181 6765