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Python Education

r/learnpython

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Posted by4 days ago

Ask Anything Monday - Weekly Thread

5
49 comments
261
Posted by15 hours ago

Just discovered a huge hole in my learning. Thought I'd share.

A funny thing about being entirely self-taught is that a person can go pretty far in their Python journey without learning some core concepts. I discovered one today. Let's say I have a class called Pet:

class Pet:
    def __init__(self, type, name, number):
        self.type = type
        self.name = name
        self.number = number

And I create a couple pets:

rover = Pet('dog', 'Rover', 1)
scarlet = Pet('cat', Scarlet', 2)

And I put those pets in a list:

pets = [rover, scarlet]

And I do some Pythoning to return an item from that list:

foo = pets[0]
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91 comments
3
Posted by5 hours ago

Building a game as a beginner/intermediate - too much?

Id love to build something like a run n gun platformer in Python, like contra or Metal Slug from back in the day. Obv not as advanced, but something just to get started, and maybe add layers of complexity over time. My question is, is this too much for a beginner to undertake? Feel like it will especially get me exposure to concepts Im otherwise light on like OOP etc


Is this a good idea? Am i jumping too far ahead? Was thinking of using something like pygame or whatever else is out there


Note that the primary focus of this project is to deepen my understanding of Python. Not so much to have a tip top quality game right off the bat (although im hoping that years down the line, the project could look much more 'advanced' than when it started initially)

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5 comments
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Posted by4 hours ago

"With" statment on a list of context managers?

Let's say I have some arbitrary list of context managers. Is there a way to have them all executed in a with block? Imagine something like this

# lets say cm_list is a parameter passed in
with cm_list:
    # the __enter__ function of each one of these is called
    # and the __exit__ is called on exit for each

I know you can do a compound with statement, but in this case I have some unknown number of context managers so I can't use the usual method here

with cm1, cm2, cm3:
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6 comments
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Posted by42 minutes ago

[HELP] How do I solve this error : Expected input batch_size (1140) to match target batch_size (632)

I am trying to train GPT2 model on a task as in this notebook : Colab notebook

I am getting the following error :

ValueError: Expected input batch_size (1140) to match target batch_size (632).

The relevant code is as follows :

device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
device = torch.device('cpu')
for epoch in range(max_epochs): model.train() total_loss = 0 batch_count = 0
for batch_input, batch_output in train_loader:
    batch_size_actual = batch_input.size(0)

    # Check if the batch sizes are different and skip the incomplete batch
    if batch_size_actual != batch_size:
        continue

    batch_input = batch_input.to(device)
    batch_output = batch_output.to(device)
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0 comments
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Posted by57 minutes ago

Pydroid 3: filenotfounderror: (errno 2) no such file or directory but file is there: Asking for a Solution!

https://media.discordapp.net/attachments/1106163304688259102/1106243388342284358/Screenshot_20230511-113607-870.png

Here's the image. It keeps saying that my file or directory for "advertise_master" isn't here but it clearly is. I've tried moving it around and nothing, can anyone please just help me with this?

Vote
1 comment

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