python面试题，print写在for循环内和外的区别

1、统计列表中正数和负数的数量
a = [1,3,5,7,0,-1,-9,-4,-5,8]
b = []
c = []
for i in a :
    if i>0:
        b.append(i)
    elif i<0:
        c.append(i)
    else:
        pass
    print (len(b))
    print (len(c))
##打印函数在for循环内，输出的结果是

1
0
2
0
3
0
4
0
4
0
4
###打印函数放在if语句外

a = [1,3,5,7,0,-1,-9,-4,-5,8]
b = []
c = []
for i in a :
    if i>0:
        b.append(i)
    elif i<0:
        c.append(i)
    else:
        pass
print (len(b))
print (len(c))
##打印的结果
5
4