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Tag: python

append only if item isn’t already appended?

In my Python application, I have the following lines: How can I only trigger the append statement if the index hasn’t been already appended previously? Answer Simply test if your index not in your list:

Pandas: Is better aggregation possible

I have sample dataframe above. I wish to calculate percentage True for each date. I am able to do as below. But, feel it can be done with groupby + agg. Is it possible? My attempt: Answer You can do groupby like this: Output: You can get both percentages for T and F with crosstab: Output: Note 1: Extra commen…

why does the mse loss had a sudden jump?

i’m working on a regression problem using neural network. the mse loss would decrease at the beginning of train and the accuracy is satisfactory, yet, when the train process goes on, the loss had a huge jump, and maintain at a certain value,like the curve in the picture. i don’t know why and how t…

Connection reset by peer error showing despite using try

I have a server like this: but the error of ConnectionResetError: [Errno 104] Connection reset by peer still occurs on client disconnection, shouldn’t the error be handled by try except ? If not how else do I handle this error without the script being terminated? Answer From this answer I found the foll…

No Django POST data when sent over a form?

I am on a development server (no CSRF protection), sending over login data to Django via a web form (Django: 127.0.0.1:8000). HTML: Django: I’m pretty sure that the POST data is not being transmitted (TypeError: unsupported operand type(s) for +: ‘NoneType’ and ‘str’) in the prin…