Function hash2

Hash.py:16–20

(astring, tablesize)

# 改进hash, 让每一位的字母乘以该字母在字串中的位置然后mod
def hash2(astring, tablesize):
    sum = 0
    for pos in range(len(astring)):
        sum += (pos+1) * ord(astring[pos])
    return sum%tablesize

print(hash2('cat', 11))