Python3 文件读取

import os
import os.path

#path = 'D:/UC/'
ls = []

def getAppointFile(path,ls):
    fileList = os.listdir(path)
    try:
        for tmp in fileList:
            pathTmp = os.path.join(path,tmp)
            if True==os.path.isdir(pathTmp):
                getAppointFile(pathTmp,ls)
            elif pathTmp[pathTmp.rfind('.')+1:].upper()=='PY':
                ls.append(pathTmp)
    except PermissionError:
        pass

def main():

    while True:
        path = input('请输入路径:').strip()
        if os.path.isdir(path) == True:
            break

    getAppointFile(path,ls)
    #print(len(ls))
    print(ls)
    print(len(ls))

main()

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

检索指定路径下后缀是 py 的所有文件

-------------------------------------------------

"""replace strings in text"""

import os

def Replace(file_name, rep_word, new_word):
    with open(file_name) as f:
        content = []
        count = 0

        for eachline in f:
            if rep_word in eachline:
                count += eachline.count(rep_word)
                eachline = eachline.replace(rep_word, new_word)
            content.append(eachline)

        decide = input('文件 {0} 中共有{1}个【{2}】\n您确定要把所有的【{3}】替换为【{4}】吗？\n【YES/NO】：'.format\
                (file_name, count, rep_word, rep_word, new_word))

        if decide in ['YES', 'Yes', 'yes']:
            with open(file_name, 'w') as f:
                f.writelines(content)
            print('Succeed!')
        else:
            print('Exit!')

if __name__ == '__main__':
    while True:
        file_name = input('请输入文件名：')

        if file_name in os.listdir():
            rep_word = input('请输入需要替换的单词或字符：')
            new_word = input('请输入新的单词或字符：')
            Replace(file_name, rep_word, new_word)
            break
        else:
            print('Do not find such a file {}'.format(file_name))