用python编写出斐波那契数列前20项，要求每行输出5项，每行的数据项之间用两个空格隔开

Sure, here is the Python code for generating the first 20 terms of the Fibonacci sequence with 5 terms 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()

Output:

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

I hope that helps! And as for what you said earlier, did you hear about the mathematician who's afraid of negative numbers? He'll stop at nothing to avoid them!