PyCharm Debugger does not display my class attributes

Have you checked under Special Variables?

For example:

UPD:

Shouldn't you unfold mp variable instead of matches?

Thank you for you're reply, if I understand correctly looking at the variable mp in the first screenshot you can see the arrow is facing down; but no attributes are displayed. I can toggle the arrow.

I tried again today with no success

And I couldn't find mp or matches in the Special Variables either:

Ahh, sorry, I didn't notice it.

Would it be possible to provide a code snippet and steps for reproducing the issue?
I can't reproduce it with my code based on your screenshots.

Ok, lets see I've paired down the project

sale0 = {'itemId': '224111461072', 'title': "1x Uro, Titan of Nature's Wrath Theros Beyond Death THB MTG NM", 'globalId': 'EBAY-US', 'primaryCategory': {'categoryId': '38292', 'categoryName': 'MTG Individual Cards'}, 'galleryURL': 'https://thumbs1.ebaystatic.com/m/mTbHa5hZhHeHH_vmkQkijNQ/140.jpg', 'viewItemURL': 'https://www.ebay.com/itm/1x-Uro-Titan-Natures-Wrath-Theros-Beyond-Death-THB-MTG-NM-/224111461072', 'paymentMethod': 'PayPal', 'autoPay': 'true', 'postalCode': '283**', 'location': 'Dudley,NC,USA', 'country': 'US', 'shippingInfo': {'shippingType': 'Calculated', 'shipToLocations': 'Worldwide', 'expeditedShipping': 'false', 'oneDayShippingAvailable': 'false', 'handlingTime': '2'}, 'sellingStatus': {'currentPrice': {'_currencyId': 'USD', 'value': '34.99'}, 'convertedCurrentPrice': {'_currencyId': 'USD', 'value': '34.99'}, 'sellingState': 'EndedWithSales'}, 'listingInfo': {'bestOfferEnabled': 'true', 'buyItNowAvailable': 'false', 'startTime': '2020-08-09T11:06:39.000Z', 'endTime': '2020-08-09T17:59:20.000Z', 'listingType': 'FixedPrice', 'gift': 'false'}, 'returnsAccepted': 'false', 'condition': {'conditionId': '1000', 'conditionDisplayName': 'New'}, 'isMultiVariationListing': 'false', 'topRatedListing': 'false'}
sale1 = {'itemId': '124264171306', 'title': 'Cruel Celebrant x2, War of the Spark, NM MTG', 'globalId': 'EBAY-US', 'primaryCategory': {'categoryId': '38292', 'categoryName': 'MTG Individual Cards'}, 'galleryURL': 'https://thumbs3.ebaystatic.com/m/mLIR7NRyESaNj9zY6eBuwMA/140.jpg', 'viewItemURL': 'https://www.ebay.com/itm/Cruel-Celebrant-x2-War-Spark-NM-MTG-/124264171306', 'paymentMethod': 'PayPal', 'autoPay': 'true', 'postalCode': '281**', 'location': 'Shelby,NC,USA', 'country': 'US', 'shippingInfo': {'shippingServiceCost': {'_currencyId': 'USD', 'value': '0.0'}, 'shippingType': 'Free', 'shipToLocations': 'Worldwide', 'expeditedShipping': 'false', 'oneDayShippingAvailable': 'false', 'handlingTime': '1'}, 'sellingStatus': {'currentPrice': {'_currencyId': 'USD', 'value': '2.29'}, 'convertedCurrentPrice': {'_currencyId': 'USD', 'value': '2.29'}, 'sellingState': 'EndedWithSales'}, 'listingInfo': {'bestOfferEnabled': 'true', 'buyItNowAvailable': 'false', 'startTime': '2020-07-17T17:25:06.000Z', 'endTime': '2020-08-09T17:58:52.000Z', 'listingType': 'StoreInventory', 'gift': 'false'}, 'returnsAccepted': 'false', 'condition': {'conditionId': '1000', 'conditionDisplayName': 'New'}, 'isMultiVariationListing': 'false', 'topRatedListing': 'false'}


class MatchedPurchase:

    def __init__(self, query_result):
        self.set_match_percent = 90
        self.complete_query = query_result
        self.ebay_id = query_result['itemId']
        self.ebay_title = query_result['title']
        self.set_matches = []
        self.card_matches = []
        self.multiverse_id = None
        self.qty = '1'
        self.foil = False
        self.language = 'English'

    def __dict__(self):
        classDict = {
            'ebay_id': self.ebay_id,
            'ebay_title': self.ebay_title,
            'set_matches': self.set_matches,
            'name_matches': self.card_matches,
            'multiverse_id': self.multiverse_id,
            'qty': self.qty,
            'foil': self.foil,
            'language': self.language,
        }
        return classDict


mp1 = MatchedPurchase(sale0)
mp2 = MatchedPurchase(sale1)
print('hmmm')

Produces the following result:

Requirements.txt: 

beautifulsoup4==4.9.1
bs4==0.0.1
certifi==2020.6.20
chardet==3.0.4
click==7.1.2
colorama==0.4.3
configparser==5.0.0
crayons==0.3.1
cycler==0.10.0
decorator==4.4.2
ebaysdk==2.2.0
fake-useragent==0.1.11
Flask==1.1.2
Flask-WTF==0.14.3
Fuzzy==1.2.2
fuzzywuzzy==0.18.0
gunicorn==20.0.4
idna==2.10
imageio==2.9.0
imutils==0.5.3
inflect==4.1.0
itsdangerous==1.1.0
Jinja2==2.11.2
kiwisolver==1.2.0
lxml==4.5.2
MarkupSafe==1.1.1
matplotlib==3.3.0
mtgsdk==1.3.1
networkx==2.4
numpy==1.19.1
opencv-python==4.3.0.36
pandas==1.1.0
Pillow==7.2.0
psycopg2-binary==2.8.5
pyparsing==2.4.7
python-dateutil==2.8.1
python-Levenshtein==0.12.0
pytube3==9.6.4
pytz==2020.1
PyWavelets==1.1.1
requests==2.24.0
scikit-image==0.17.2
scipy==1.5.2
seaborn==0.10.1
selenium==3.141.0
six==1.15.0
soupsieve==2.0.1
SQLAlchemy==1.3.18
tifffile==2020.7.24
typing-extensions==3.7.4.2
urllib3==1.25.10
webdriver-manager==3.2.1
Werkzeug==1.0.1
WTForms==2.3.3

Ahh, I see. I wasn't able to reproduce it because I didn't add __dict__ attribute and it seems to be the culprit. I filed a bug to our issue tracker about that https://youtrack.jetbrains.com/issue/PY-43955, feel free to vote and comment.

Thank you so much for your help! This is my first time working with a professional IDE and I'm very happy with PyCharm. Its crazy to think I've deployed systems to customers using basically text editors - this makes everything much more manageable; I was pulling my hair out wondering what could be going on.