Python: 字串 str.find(關鍵字[,start][,end]),找不到的話回傳-1,如何找出資料字串中,所有關鍵字的index?詞頻計算

by 儲蓄保險王 · 2022-11-22

資料來源: https://docs.python.org/3/library/stdtypes.html#str.find

data.txt:

I love you all. But you do love love me at all.\nYou always love Python.

程式碼:

filePath = r”C:\Python\myfind\data.txt”

def keywordIndexFromFile(patterns : str, filePath : str) -> list:        

    with open(filePath,”r”) as f:

        dataStr = f.read()

        #print(dataStr)

        lst=[]

        idx = dataStr.find(patterns)

        #lst=[ idx ]        

       

        while idx != -1:

            #idxTmp = dataStr.find(patterns,idx+1)

            lst.append( idx )

            idx = dataStr.find(patterns,idx+1)

    return lst

print(keywordIndexFromFile(“love”,filePath))

參考解答:

 

詞頻計算:

# -*- coding: utf-8 -*-

from typing import Tuple

filePath = r”C:\Python\myfind\data.txt”

def keywordIndexFromFile(patterns : str,

         filePath : str) -> Tuple[list[int],float]:        

    with open(filePath,”r”) as f:

        dataStr = f.read()

        #print(dataStr)

    lst=[]

    idx = dataStr.find(patterns)

    #lst=[ idx ]        

   

    while idx != -1:

        #idxTmp = dataStr.find(patterns,idx+1)

        lst.append( idx )

        idx = dataStr.find(patterns,idx+1)

    lstAll = dataStr.split(” “)

    #print(lstAll , len(lstAll))

    termFrequency = len(lst) / len( lstAll )

    return lst, termFrequency

lst, termFrequency = keywordIndexFromFile(“love”,filePath)

print(“Key word index:”,lst)

print(“詞頻: %.2f %%” %(termFrequency*100) )

參考解答:

 

改用**dict當作輸入參數:

 

推薦hahow線上學習python: https://igrape.net/30afN

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儲蓄保險王

儲蓄險是板主最喜愛的儲蓄工具,最喜愛的投資理財工具則是ETF,最喜愛的省錢工具則是信用卡

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