str_test = 'the quick brown for jumps over the lazy dog.'
str_test = str_test.replace('.,!?、',"")
slist = str_test.split(" ")
def WordCounter(slist):
    rstd = dict()
    for i in slist:
        if i in rstd.keys():
            rstd[i] += 1
        else:
            rstd[i] = 1
    return rstd
print("词频统计结果:",WordCounter(slist))

结果：

python手动实现WorldCount_词频统计