This user's avatar is too old to generate a proper date for, so you get a special null object instead. It didn't support a date - datetime(...) operation, but it does now (https://github.com/mikf/gallery-dl/commit/ad73789256502426c6d39931cf9196f67e008751).

[maplestory03]

This user's avatar is too old to generate a proper date for, so you get a special null object instead. It didn't support a date - datetime(...) operation, but it does now (ad73789).

You could also use conditional format strings to test if date has an actual value.

Originally posted by @mikf in #6007 (comment)

If I want to customize it , how to fix it?

      "avatar":{
        "filename": { 
        
        "locals().get('date') == None"        :"[avatar] {tweet_id} .{extension}",
        ""                                    :"[avatar] {tweet_id} {date:Olocal/%Y-%m-%d}.{extension}"          
                    }
               }

[maplestory03]

I tried it out.

          "avatar":{
            "filename": { 
            "locals().get('date') is None"         :"[avatar] {tweet_id} {date:Olocal/%Y-%m-%d}.{extension}" ,
            ""                                                  :"[avatar] {tweet_id} .{extension}"   
                        }
                   }

this can work

[mikf]

"locals().get('date') is None"

1. This doesn't work and
2. It should be the condition for "there is a valid date available", not the reverse

Just "date" is enough here.

Also, you can still post in closed issues.

[maplestory03]

"locals().get('date') is None"

1. This doesn't work and
2. It should be the condition for "there is a valid date available", not the reverse

Just "date" is enough here.

Also, you can still post in closed issues.

@mikf
I run it under Windows and can download it normally with the correct name.
If we follow the correct rules, how do we need to modify it here?
The judgment condition when the date is None
when date is None, filename don't use date

[mikf]

not date

[maplestory03]

not date

          "avatar":{
            "filename": { 
            ""                                    :"[avatar] {tweet_id}.{extension}" ,
            "not date"        :"[avatar] {tweet_id} {date:Olocal/%Y-%m-%d}.{extension}" 
               
                        }
                   }

@mikf
[twitter][error] FilenameFormatError: Applying filename format string failed (TypeError: 'CustomNone' object cannot be interpreted as an integer)
If use this, there will be an error and there will be no download

[mikf]

    "avatar": {
        "filename": { 
            "date": "[avatar] {tweet_id} {date:Olocal/%Y-%m-%d}.{extension}",
            ""    : "[avatar] {tweet_id}.{extension}"
        }
    }

All you had to do was to replace "locals().get('date') is None" with "date"