问Python脚本，用于在目录中搜索特定的文件类型，然后将其内容追加到一起

EN

import os

MATH_FILES = list()

def single_dir(name)
    global MATH_FILES
    names = [os.path.join(name, item) for item in os.listdir(name)]
        for name in names:
           if ".math" in name and os.path.isfile(name):
               print("%s has .math in the name" % name)
               MATH_FILES.append(name)

def recursive(name):
    global MATH_FILES
    if ".math" in name and os.path.isfile(name):
        print("%s has .math in the name" % name)
        MATH_FILES.append(name)
    try:
        names = [os.path.join(name, item) for item in os.listdir(name)]
        for name in names:
            recurse(name)
    except:
        # Can't listdir() a file, so we expect this to except at the end of the tree.  
        pass

def sum_file_contents():
    value = int()
    for file in MATH_FILES:
        value += int(open(file, "r").read().strip())
    return value

if __name__ == "__main__":
    # Choose implemntation here
    # recursive("<insert base path here>")
    # single_dir("<insert base path here>")
    print(sum_file_contents())