Recent questions tagged Python

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python - How do I raise a FileNotFoundError properly?

I use a third-party library that's fine but does not handle inexistant files the way I would like. When ... , without having to reimplement it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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166 views

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python - Does PyCharm support Jinja2?

A bottle project of mine uses Jinja2. PyCharm does not automatically recognize it and shows such lines as errors. ... way to make Jinja2 work? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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285 views

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python - Count all values in a matrix greater than a value

I have to count all the values in a matrix (2-d array) that are greater than 200. The code I wrote down for ... there a simpler way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to loop through a generator

How can one loop through a generator? I thought about this way: gen = function_that_returns_a_generator(param1, param2) ... a more pythonic way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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261 views

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python - Converting a float to a string without rounding it

I'm making a program that, for reasons not needed to be explained, requires a float to be converted into a string to ... : len(str(float(x)/3)) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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640 views

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python - Cell-var-from-loop warning from Pylint

For the following code: for sort_key, order in query_data['sort']: results.sort(key=lambda k: get_from_dot_path(k ... an example of the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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180 views

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python - SciPy optimization with grouped bounds

I am trying to perform a portfolio optimization that returns the weights which maximize my utility function. I can do ... x * scalars[x.name]) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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194 views

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python - Running Scrapy from a script - Hangs

I'm trying to run scrapy from a script as discussed here. It suggested using this snippet, but when I ... compatible with the current stable? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - scrapy authentication login with cookies

i am new to scrapy and decided to try it out because of good online reviews. I am trying to login to a ... ('/html/head/title').extract() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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177 views

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python - Can’t download youtube video

I'm having trouble retrieving the Youtube video automatically. Here's the code. The problem is the last part. ... : HTTP Error 403: Forbidden See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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420 views

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python - how code a Image button in PyQt?

Im trying to do simple audio player, but I want use a image(icon) as a pushbutton. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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329 views

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python - How to access weighting of indiviual decision trees in xgboost?

I'm using xgboost for ranking with param = {'objective':'rank:pairwise', 'booster':'gbtree'} As I ... with the shrinkage parameter eta ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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182 views

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python - Image resizing with django?

I'm new to Django (and Python) and I have been trying to work out a few things myself, before jumping ... working this problem out. Thank you! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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477 views

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python - Using a dictionary in Cython , especially inside nogil

I am having a dictionary, my_dict = {'a':[1,2,3], 'b':[4,5] , 'c':[7,1,2]) I want to use ... the same in Cython Can anyone please help me out ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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287 views

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python - Is there a general way to run Web Applications on Google Colab?

I would like to develop web apps in Google colab. The only issue is that you need a browser connected ... webapps in colab/jupyter notebooks? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

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python - Decoder JPEG not available error when following Django photo app tutorial

I am following a Django tutorial that involves image uploading, and have run into this problem. I tried installing and ... 1 tests of 57 failed. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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294 views

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python - How to iterate through a nested dict?

I have a nested python dictionary data structure. I want to read its keys and values without using ... iterate through the dictionary. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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180 views

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python - creating pandas data frame from multiple files

I am trying to create a pandas DataFrame and it works fine for a single file. If I need to build it for ... a list of files into a DataFrame. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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357 views

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python - Plot GDAL raster using matplotlib Basemap

I would like to plot a raster tiff (download-723Kb) using matplotlib Basemap. My raster's projection coordinates ... .drawcountries(color='red') See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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199 views

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python tkinter with a simple web wrapper

I am writing a simple python program with a UI, and i can't find out how to put a web page inside the ... ) win.show_all() gtk.main() Jack See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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221 views

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python - SQLite foreign key examples

I am not an expert in sql / sqlite.. suppose we have two tables: CREATE TABLE child ( id INTEGER PRIMARY ... of dogs associated with that child? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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274 views

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python - How to group the choices in a Django Select widget?

Is it possible to created named choice groups in a Django select (dropdown) widget, when that widget is on a ... class. Which is very nice. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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365 views

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python - AppEngine Making ndb models json serializable

We have an ndb model that we would like to make json serializable. The models are fairly simple along the lines of: ... a niftier way to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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python - scikit learn - feature importance calculation in decision trees

I'm trying to understand how feature importance is calculated for decision trees in sci-kit learn. ... feature importance calculated correctly? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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209 views

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python - Concurrency control in Django model

How do I handle concurrency in a Django model? I don't want the changes to the record being overwritten by ... user who reads the same record. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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375 views

1 answer

python - Understanding argmax

Let say I have the matrix import numpy as np A = np.matrix([[1,2,3,33],[4,5,6,66],[7,8,9, ... bit unclear. Thanks for the help and explanation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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177 views

1 answer

python - How to read lines from a mmapped file?

Is seems that the mmap interface only supports readline(). If I try to iterate over the object I get ... characters instead of whole line See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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302 views

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python - Understanding Tensorflow LSTM Input shape

I have a dataset X which consists N = 4000 samples, each sample consists of d = 2 features (continuous ... each an independent time series. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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