Recent questions tagged Python

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python - environment variables PYSPARK_PYTHON and PYSPARK_DRIVER_PYTHON

I have installed pyspark recently. It was installed correctly. When I am using following simple program in python, I ... I am using Python 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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python - Basic 1d convolution in tensorflow

OK, I'd like to do a 1-dimensional convolution of time series data in Tensorflow. This is apparently supported using ... , I'd be very grateful. 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 generate data model from sql schema in Django?

Our website uses a PHP front-end and a PostgreSQL database. We don't have a back-end at the moment ... Django and create models automatically? 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 initialise only optimizer variables in Tensorflow?

I want to use MomentumOptimizer in Tensorflow. However, since this optimizer uses some internal variable, attempting to use ... 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 - Use Flask to convert a Pandas dataframe to CSV and serve a download

I have a Pandas dataframe in my Flask app that I want to return as a CSV file. return Response(df. ... 'text/csv' return Response(response) 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 - Is "norm" equivalent to "Euclidean distance"?

I am not sure whether "norm" and "Euclidean distance" mean the same thing. Please could you help me with this distinction ... norm(a[i,:] - pos) 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 - Horizontal box plots in matplotlib/Pandas

Bar plots: matplotlib offers the function bar and barh to do vertical and horizontal bar plots. Box plots: ... get a horizontal box plot? 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 write multiple conditions of if-statement in Robot Framework

I have trouble writing if conditions in Robot Framework. I want to execute Run Keyword If '${color}' == 'Red' ... I just end up getting errors. 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 - pandas DataFrame, how to apply function to a specific column?

I have read the docs of DataFrame.apply DataFrame.apply(func, axis=0, broadcast=False, raw=False, reduce=None ... .apply. Thanks for help! 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 read mp4 video to be processed by scikit-image?

I would like to apply a scikit-image function (specifically the template matching function match_template) to the ... would thus be ideal. See Question&Answers more detail:os...

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

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237 views

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python - Limiting Memory Use in a *Large* Django QuerySet

I have a task which needs to be run on 'most' objects in my database once every some period of time (once ... the queried-for objects at all. 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 do I get word frequency in a corpus using Scikit Learn CountVectorizer?

I'm trying to compute a simple word frequency using scikit-learn's CountVectorizer. import pandas as pd import numpy as np ... 2, u'fish': 2}. 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 queue & multiprocessing queue: how they behave?

This sample code works (I can write something in the file): from multiprocessing import Process, Queue queue = Queue() ... and the right to do? See Question&Answers more detail:os...

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

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416 views

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python - Install pip on pypy

I want to speed up my program so i'm trying to setup pypy + psycopg2cffi. This program opens a xml, parses it ... install it on pypy? 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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605 views

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python - Cannot upgrade pip 9.0.1 to 9.0.3 - requirement already satisfied

I'm trying to update pip using pip install --upgrade pip, but I get a "requirement satisfied" error and an " ... ' command. How do I update? See Question&Answers more detail:os...

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

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316 views

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python - How do I use numba on a member function of a class?

I'm using the stable version of Numba 0.30.1. I can do this: import numba as nb @nb.jit("void(f8[:] ... it needs to access a member variable. See Question&Answers more detail:os...

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

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181 views

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python - How to convert a string to an image?

I started to learn python a week ago and want to write a small program that converts a email to a image (.png) so ... ) img.save("D:/image.png") See Question&Answers more detail:os...

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

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586 views

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python - Recursively compare two directories to ensure they have the same files and subdirectories

From what I observe filecmp.dircmp is recursive, but inadequate for my needs, at least in py2. I want to ... build this using os.walk instead. See Question&Answers more detail:os...

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

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476 views

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python - Stop processing Flask route if request aborted

I have a flask REST endpoint that does some cpu-intensive image processing and takes a few seconds to return ... client aborts their request? See Question&Answers more detail:os...

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

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257 views

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python - What is the difference between installing a package using pip vs. apt-get?

I'm trying to deploy a Django site on an Ubuntu machine. I need to install Psycopg2 and PIL but it ... in the global python environment. See Question&Answers more detail:os...

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

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313 views

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python - Can pip (or setuptools, distribute etc...) list the license used by each installed package?

I'm trying to audit a Python project with a large number of dependencies and while I can manually look ... license metadata for Python packages? See Question&Answers more detail:os...

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

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358 views

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python - how to use pandas filter with IQR

Is there a built-in way to do filtering on a column by IQR(i.e. values between Q1-1.5IQR and Q3+ ... in pandas suggested will be appreciated. See Question&Answers more detail:os...

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

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429 views

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python - Normalizing images in OpenCV

I wrote the following code to normalize an image using NORM_L1 in OpenCV. But the output image was just ... waitKey(0) cv2.destroyAllWindows() See Question&Answers more detail:os...

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

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292 views

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python - Filtering grouped DataFrame in Pandas

I am creating a groupby object from a Pandas DataFrame and want to select out all the groups with > 1 size. Example: ... Result: A foo 0 2 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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370 views

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python - render_template with multiple variables

I am using Flask(as framework) and MongoDB(as database server). Right now, all i can do is just pass one ... to do that by using Flask? See Question&Answers more detail:os...

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

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332 views

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python - Dynamically limiting queryset of related field

Using Django REST Framework, I want to limit which values can be used in a related field in a creation. For ... in the browsable API renderer? See Question&Answers more detail:os...

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

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179 views

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python - Django, name parameter in urlpatterns

I'm following a tutorial where my urlpatterns are: urlpatterns = patterns('', url(r'^passwords/$', ... parameter passed to the view? See Question&Answers more detail:os...

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

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332 views

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python - Plotting with a transparent marker but non-transparent edge

I'm trying to make a plot in matplotlib with transparent markers which have a fixed color edge . However, I ... a solution to this please? See Question&Answers more detail:os...

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

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