在文件夹和子文件夹中搜索多个文件 python

Question

Trying to search for a search word inside multiple files in current folder and sub folders and print them to a file.

i can print out the files in terminal using os.walk. But i want to search all the files in the folders for a specific word

    import glob, os
    
   output_file = 'Funkar.txt'
search_str = '"Prefix"'

for root, dirs, files in os.walk("."):
    for file in files:
        if file.endswith(".wpp"):
             print(os.path.join(root, file))

        with  open(os.path.join(root, file), 'r') as fr, open (output_file,'a',  encoding='utf-8') as fw:
            for i,line in enumerate(fr):
                if line.find(search_str) != -1: 
                    fw.write(line)

now gives me

in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 12: character maps to <undefined>

Answer 1

Search and print:

import os
def search( folder, word ):
    for root, dirs, files in os.walk(folder):
        path = root.split(os.sep)
        for filename in files:
            fullname = os.path.join(root, filename)
            if open( fullname ).read().find( word ) != -1:
                print( fullname ) 

search( "FolderName", 'any text')

Search and backup searched lines:

import os
def search( folder, word, bfile ):
    for root, dirs, files in os.walk(folder):
        path = root.split(os.sep)
        for filename in files:
            fullname = os.path.join(root, filename)
            if open( fullname ).read().find( word ) != -1:
                print( fullname ) 
                blines = [x for x in open(fullname).readlines() if x.find(word) != -1]
                open( bfile, 'a' ).writelines(blines) 

search( "FolderName", 'any text', 'backup-lines.file')