Python中FileAndDirectory对象调用异常：解析扁平二进制文件遇问题

Hey there! Let's work through this directory object creation issue together. Since your file objects are working fine but directories are throwing errors, let's break down the common pitfalls and fix them step by step.

First, Let's Validate the FileAndDirectory Class Definition #

The most likely culprit is a mismatch between the parameters you're passing for directories and what the class expects. Let's start with a typical example of how this class might be structured, then compare correct vs. incorrect calls.

Suppose your class looks something like this (adjust based on your actual code):

class FileAndDirectory:
    def __init__(self, name, entry_type, size=None, children=None):
        self.name = name
        # Distinguishes files vs directories (e.g., 'file' or 'dir')
        self.entry_type = entry_type
        self.size = size  # Only relevant for files
        # Directories need a list to hold child files/dirs
        self.children = children if children is not None else []

Correct Calls for Files vs Directories #

Your working file object call might look like this:

# Works because we pass all required params for a file
my_file = FileAndDirectory("report.pdf", "file", size=2048)

For directories, you might be missing critical parameters like entry_type or forgetting to initialize the children list. Here's the right way:

# 1. Create an empty directory
empty_dir = FileAndDirectory("documents", "dir")

# 2. Create a directory with existing child objects
sub_file = FileAndDirectory("notes.txt", "file", size=512)
parent_dir = FileAndDirectory("projects", "dir", children=[sub_file])

Fix Common Error Scenarios #

Let's map common errors to fixes:

• TypeError: __init__() missing 1 required positional argument: 'entry_type': You forgot to specify that this is a directory. Always pass entry_type="dir" (or whatever your class uses for directory identifiers) when creating directory objects.
• AttributeError: 'FileAndDirectory' object has no attribute 'children': Your class might initialize children only if explicitly passed. Make sure the __init__ method sets a default empty list for children (like the example above) so directories always have this attribute.
• ValueError: Expected list for children, got str: If you're passing raw directory names instead of instantiated FileAndDirectory objects, you'll hit this. Always convert child entries to proper objects first before adding them to a directory's children list.

Quick Troubleshooting Checklist #

1. Check the class source: Look at the __init__ method of FileAndDirectory to confirm exactly which parameters are required for directories.
2. Compare file vs directory calls: Line up your working file object code next to your broken directory code—spot the missing parameters or incorrect values.
3. Print debug info: Before creating the directory object, print the values you're passing (e.g., print(f"Dir name: {dir_name}, type: {entry_type}, children: {child_objects}")) to ensure they match what the class expects.

内容的提问来源于stack exchange，提问作者M2m