Problem with class(dict) and self

Coding
,
#1

Hi, guys
I still new with python and have learn maya about few month, i have some problem with this code when i watch a tutorial and i cant tell how. Every time i run load function its seem my self[name] is empty. Its not suppose to be like that in the tutorial. So what did I do wrong? Thank a lot

Blockquote

import maya.cmds as cm
import os
import json
import pprint

USERAPPDIR = cm.internalVar(userAppDir=True)
DIRECTORY = os.path.join(USERAPPDIR , ‘controllerLibrary’)

def createDirectory(directory=DIRECTORY):
“”"
Creates the given directory if it’s does’t exist
Args:
directory (string) : The directory to create

"""
if not os.path.exists(directory):
    os.mkdir(directory)

class ControllerLibrary(dict):

def save(self , name , directory=DIRECTORY , **info):

    createDirectory(directory)

    path = os.path.join(directory , '{}.ma'.format(name))
    infoFile = os.path.join(directory , '{}.json'.format(name))
    info['name'] = name
    info['path'] = path

    cm.file(rename=path)
    if cm.ls(sl=True):
        cm.file(force=True , type='mayaAscii' , exportSelected=True)

    else:
        cm.file(save=True , type='mayaAscii' , force=True)

    with open(infoFile , 'w') as f:
        json.dump(info , f , indent=4)

    self[name] = info

def find(self , directory=DIRECTORY):

    if not os.path.exists(directory):
        return

    files = os.listdir(directory)
    mayaFiles = [f for f in files if f.endswith('.ma')]

    for ma in mayaFiles:
        name , ext = os.path.splitext(ma)
        path = os.path.join(directory , ma)

        infoFile = '{}.json'.format(name)
        if infoFile in files:
            infoFile = os.path.join(directory , infoFile)

            with open(infoFile , 'r') as f:
                info = json.load(f)

        else:
            info = {}

        info['name'] = name
        info['path'] = path

        self[name] = info

    pprint.pprint(self)

def load(self , name):

    print (self.get(name))
    path = self[name]['path']
    cm.file(path, i=True, usingNamespaces=False)
#2

it works for me

cl = ControllerLibrary()
cl.save('hello')
print cl['hello']

result

{'path': u'C:/Users/joey/Documents/maya/controllerLibrary\\hello.ma', 'name': 'hello'}

Personal note - sub classing dict is a strange choice. Maybe there’s some functionality he’s planning to add? For what it is currently, I would not sub class dict and would change self[name] to self.name.

self[name] >> self.name
print (self.get(name)) >> print self.name
path = self[name]['path'] >> path = self.name['path']

cl = ControllerLibrary()
cl.save('hello')
print cl.name
2 Likes
#3

Subclassing from dict comes with all sorts of problems: https://treyhunner.com/2019/04/why-you-shouldnt-inherit-from-list-and-dict-in-python/

It is recommended to subclass from abc’s MutableMapping and implement the abstract methods yourself, if you would like to continue with the dict approach: https://docs.python.org/3/library/collections.abc.html

2 Likes
#4

Thank a lots for answer, take me sometime to understand, this is kind of out of my league :slight_smile: , but i’m addicted