Python:用于独立和 for 循环的通用 try-except 包装器继续

Question

很抱歉，如果以前有人问过这个问题，但我找不到类似的问题，希望SO会在我输入时推荐我一个。

方案：手动创建的包含子文件夹和文件的文件夹。在每个级别的文件夹中，我想执行特定的功能。与其在每次遇到错误时都引发异常，我想将它们打印出来并继续循环，以便最后有一个完整的错误列表。

这是一个 MWE，使用我的代码外观的简化函数：

import os, stat
def folder_info(folder):
    if len(folder) > 20:
        raise Exception('Folder {} name too long'.format(folder))
    print(folder)
    subfolders = os.listdir(folder)
    return len(folder), subfolders
raise_error = False
folders = [f for f in os.listdir() if os.path.isdir(f)]
for folder in folders:
    try: 
        length, subfolders = folder_info(folder)
    except Exception as error:
        if raise_error: raise
        print('Error: {}'.format(error))
        continue
    for subfolder in subfolders:
        subfolder = os.path.join(folder, subfolder)
        try: 
            length, subfolders = folder_info(subfolder)
        except Exception as error:
            if raise_error: raise
            print('Error: {}'.format(error))
            continue

理想情况下，我想要一些我不必为每个嵌套循环键入try和except语句的东西。我希望什么：

for folder in folders:
    arg1, arg2 = exceptionwrapper(myfunction1(folder), raise_error)
    for subfolder in arg2:
    subfolder = os.path.join(folder, subfolder)
    arg1, arg2, arg3 = exceptionwrapper(myfunction2(subfolder), raise_error)
        for subsubfolder in arg3:
        arg1, arg2 = exceptionwrapper(myfunction3(subsubfolders), raise_error)

我已经尝试了以下带有装饰器功能的解决方案，但我无法传入continue或弄清楚它应该去哪里。这是我最好的尝试，我在尝试传入continue时遇到语法错误：

def exceptionwrapper(function, raise_error, after_error: function = continue):
    def decorator(func):
        def new_func(*args, **kwargs):
            try:
                return func(*args, **kwargs)
            except Exception as error:
                if raise_error: raise
                print('Error: {}'.format(error))
                return after_error
            return new_func
        return decorator

任何帮助将不胜感激！

Answer 1

如果你可以使用os.walk，你的整个代码可以用几行Pythonic的方式编写。

import os
for root, folders, files in os.walk(os.getcwd()):
    for folder in folders:
        print('dir is: ', folder)
        try:
            if len(folder) > 20:
                raise Exception('Folder {} name too long'.format(folder))
        except Exception as error_message:
            print('Error in folder: {} due to: {}'.format(folder, error_message))

由于您在不同的文件夹级别中指定，因此必须调用不同的函数，您可以尝试如下：

import os
curr_folder = os.getcwd()
for root, folders, files in os.walk(curr_folder):
    for folder in folders:
        print('dir is: ', folder)
        folder_level = root[len(curr_folder)+1:].count(os.sep)
        print('level is: ', folder_level)
        if folder_level == 0:
            # call myfunction0
            pass
        elif folder_level == 1:
            # call myfunction1
            pass
        elif folder_level == 2:
            # call myfunction2
            pass