groupby并获取每组元素数量

python 有两个有goupby的库

  1. pandas(需要numpy)
	import pandas as pd
	df = pd.DataFrame(log_list, columns=["msg_ori"])  # 先将list转成pd的dataframe,log_list是内容列表,columns是定义的列名索引
    df2 = df.groupby(["msg_ori"]).size()  #这里结果是pd的series,没找到很好的转dict的方法,直接硬拆字符串了
    items = str(df2).split("\n")
    result = dict()
    for item in items:
        try:
            if item == "msg_ori":
                continue
            tmp = item.rsplit(" ", 1)
            result[tmp[0]] = tmp[1]
        except:
            continue
  1. itertools
	from itertools import groupby
	from operator import itemgetter
	df2 = groupby(log_list, itemgetter(0))
	result = dict()
    for key, item in df2:
        result[key] = str(len(list(item)))

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