在充满文件的目录中递归搜索特定字符串

Question

我有一个很大的目录，里面有子目录和txt文件。 我想递归地在目录中搜索特定的字符串。 如果我找到匹配项，我想打印完整路径和关键字。由于某些原因，我似乎无法if keyword in line工作。 （我知道“ williams”在我的文件中）

import os
search_path = "/home/lasse/Desktop/DB1"
file_type = ".txt"
keyword = "williams"

if not (search_path.endswith("/") or search_path.endswith("\\")):
    search_path = search_path + "/"

if not os.path.exists(search_path):
    search_path = "." 
    print("Path dosn't exists") 

for folder, dirs, files in os.walk(search_path):
    for file in files:
        if file.endswith(file_type):
            fullpath = os.path.join(folder, file)

            with open(fullpath, 'r') as my_file:
                for line in my_file:
                    print("test")
                    if keyword in line:
                        print(fullpath, line, keyword)
                    else:
                    print("Cant find keyword keyword")