Recent questions tagged Python

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python - Remove or adapt border of frame of legend using matplotlib

When plotting a plot using matplotlib: How to remove the box of the legend? How to change the color of the border ... of the box of the legend? 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 - OpenCV – Depth map from Uncalibrated Stereo System

I'm trying to get a depth map with an uncalibrated method. I can obtain the fundamental matrix by finding ... ],XY_disp.shape[1],4) 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 - Moon / Lunar Phase Algorithm

Does anyone know an algorithm to either calculate the moon phase or age on a given date or find the dates ... dates in the Gregorian calendar. 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 choose bins in matplotlib histogram

Can someone explain to me what "bins" in histogram are (the matplotlib hist function)? And assuming I need to plot ... I did not get the idea) 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 compile a PyQt script (.py) to a single standalone executable file for windows (.exe) and/or linux?

I started to fiddle with PyQt, and made a "beautiful" script from the pyqt whitepaper example app (pastebin) It ... are not programmers 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 - What does the c underscore expression `c_` do exactly?

It seems to be some kind of horizontal concatenation, but I could not find any documentation online. Here a minimal working ... ., 0., 0.]]) 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 - Pythonic way to check if something exists?

This is pretty basic but I was coding and started wondering if there was a pythonic way to check if something ... not exist without the else? 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 - What is the difference between pickle and shelve?

I am learning about object serialization for the first time. I tried reading and 'googling' for differences in the ... ? Isn't pickle faster? 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 - VSCode: There is no Pip installer available in the selected environment

I'm trying to run the autopep8 linter on a Python file in VSCode. I've followed the instructions here: ... 't available in the 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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python - pyvenv-3.4 returned non-zero exit status 1

I'm in Kubuntu 14.04 , I want to create a virtualenv with python3.4. I did with python2.7 before in other ... ]' returned non-zero exit status 1 See Question&Answers more detail:os...

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

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465 views

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python - How do I disable "missing docstring" warnings at a file-level in Pylint?

Pylint throws errors that some of the files are missing docstrings. I try and add docstrings to each class, ... a trivial question separately.) 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 do a less than or equal to filter in Django queryset?

I am attempting to filter users by a custom field in each users profile called profile. This field is called ... barking up the wrong tree. 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 count the number of true elements in a NumPy bool array

I have a NumPy array 'boolarr' of boolean type. I want to count the number of elements whose values are True ... over the elements in my script? See Question&Answers more detail:os...

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

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356 views

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python - How to solve memory issues while multiprocessing using Pool.map()?

I have written the program (below) to: read a huge text file as pandas dataframe then groupby using ... optimization in multiprocessing steps. See Question&Answers more detail:os...

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

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185 views

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python - Help me understand Inorder Traversal without using recursion

I am able to understand preorder traversal without using recursion, but I'm having a hard time with inorder ... = self.lifo return ret See Question&Answers more detail:os...

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

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214 views

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python - Django forms, inheritance and order of form fields

I'm using Django forms in my website and would like to control the order of the fields. Here's how I define my ... ()) That shut me up :) See Question&Answers more detail:os...

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

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208 views

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python - Find integer index of rows with NaN in pandas dataframe

I have a pandas DataFrame like this: a b 2011-01-01 00:00:00 1.883381 -0.416629 2011-01-01 01:00:00 0. ... the desired output should be [3, 6]. 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 - Get Image size WITHOUT loading image into memory

I understand that you can get the image size using PIL in the following fashion from PIL import Image im = ... to make my processing faster. See Question&Answers more detail:os...

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

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471 views

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python - pandas how to check dtype for all columns in a dataframe?

It seems that dtype only work for pandas.DataFrame.Series, right? Is there a function to display data types of all columns at once? See Question&Answers more detail:os...

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

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225 views

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python - How to get the first column of a pandas DataFrame as a Series?

I tried: x=pandas.DataFrame(...) s = x.take([0], axis=1) And s gets a DataFrame, not a 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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291 views

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python - Upgrading setuptools on OSX El Capitan

I'm trying to upgrade setuptools. Well actually I'm trying to upgrade ansible but it's trying to upgrade setuptools ... wheel How can I fix 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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154 views

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python - Virtual environment in R?

I've found several posts about best practice, reproducibility and workflow in R, for example: How to increase ... ! Thanks for your thoughts. See Question&Answers more detail:os...

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

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247 views

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python - rotating coordinate system via a quaternion

We have a gazillion spatial coordinates (x, y and z) representing atoms in 3d space, and I'm constructing a ... a nudge in the right direction. See Question&Answers more detail:os...

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

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238 views

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python - How to set virtualenv for a crontab?

I want to set up a crontab to run a Python script. Say the script is something like: #!/usr/bin/python ... in crontab to activate a virtualenv? See Question&Answers more detail:os...

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

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183 views

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python - How do I use Django groups and permissions?

I understand the basic user stuff. I know authentication, login, creating accounts, etc. But now I want to work ... .com/en/dev/topics/auth/ See Question&Answers more detail:os...

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

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606 views

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python - Difference between `open` and `io.BytesIO` in binary streams

I'm learning about working with streams in Python and I noticed that the IO docs say the following: The ... different from what open does? See Question&Answers more detail:os...

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

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208 views

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python - How can I see function arguments in IPython Notebook Server 3?

I've recently switched to IPython Notebook 3 (3.1.0-cbccb68 to be exact), the Anaconda version. Previously ... can turn on this functionality. 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 - Django: display time it took to load a page on every page

In Django, how can I return the time it took to load a page (not the date) in every page of the site, without ... '</body>' print '</html>' See Question&Answers more detail:os...

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

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