對datafrmae某一列進行分詞，並對分詞後的所有字符串進行統計

import pandas as pd
import jieba

def cut_word(word):
	cw = jieba.cut(word)
    return list(cw)

df['cut_word'] = df['word'].apply(cut_word)

pd.Series(df['cut_word'].sum()).value_counts()