Recent questions tagged Python

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python - Deploying existing Django app on Heroku

Following the Heroku tutorial but I have already created a rather complex Django app that I want to upload. I ... 't Heroku recognize the app? 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 - Replacing the empty strings in a string

I accidentally found that in python, an operation of the form string1.join(string2) Can be equivalently expressed as ... -defined thing 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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python - How to compute "EMD" for 2 numpy arrays i.e "histogram" using opencv?

Since I'm new to opencv, I don't know how to use the cv.CalcEMD2 function with numpy arrays. I have ... ,This answer needs more testing. 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 - Apply styles while exporting to 'xlsx' in pandas with XlsxWriter

I use the .to_excel method of pandas to write a DataFrame as an Excel workbook. This works nice even for multi-index ... there any way to do so? 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 parse table with rowspan and colspan

First, I have read Parsing a table with rowspan and colspan. I even answered the question. Please read before you ... the table is also fine. 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 - Iterate through class members in order of their declaration

I got this problem writing a little GUI lib that maps classes to simple table views. Every class member ... OrderedDict() of columns? 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 conditions result in an opened, nonblocking named pipe (fifo) being "unavailable" for reads?

Situation: new_pipe = os.open(pipe_path, os.O_RDONLY | os.O_NONBLOCK) # pipe_path points to a FIFO data = os.read( ... , that data will be read. 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 - 404 Response when running FlaskClient test method

I'm baffled by this. I'm using an application factory in a Flask application and under the test configuration my ... an example of how it fails 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 - Numpy Routine for Computing Matrix Minors?

I'm interested in using numpy to compute all of the minors of a given square matrix. Is there a slick ... changed coefficient and its minor.) 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 - Calculate correlation between all columns of a DataFrame and all columns of another DataFrame?

I have a DataFrame object stocks filled with stock returns. I have another DataFrame object industries filled with industry ... 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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344 views

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python - numpy rollaxis - how exactly does it work?

So I was experimenting with numpy and I ran across a strange (?) behavior in the rollaxis method. In [81]: a = ... a pythonic 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 - Pip creates build/ directories

I use virtualenv to create isolated environments for my Python projects. Then i install dependencies with pip - Python ... is build/ really for? 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 - Correct usage of a getter/setter for dictionary values

I'm pretty new to Python, so if there's anything here that's flat-out bad, please point it out. I have an ... a ValueError since 14 is over 10. 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 - Combine columns in a Pandas DataFrame to a column of lists in a DataFrame

Consider the following DataFrame. n v1 v2 v3 v4 v5 0 1 2 3 4 5 1 1 2 3 4 5 2 1 2 3 4 5 For each ... 15, 20] How can I achieve this in Pandas? 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 - find largest power of two less than X number?

I m doing this def power_two(n, base = -1): result = 2 ** base if result < n: base += 1 ... example: power_two(100) return only the power 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 save figures to pdf as raster images in matplotlib

I have some complex graphs made using matplotlib. Saving them to a pdf using the savefig command uses a vector ... to get around this 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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python - matplotlib plot set x_ticks

How would I set the x_axis labels at the indices 1,2,3....n to be something different. lam_beta = [ ... would be appreciated. Thanks in advance! See Question&Answers more detail:os...

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

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305 views

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python - How to make my SWIG extension module work with Pickle?

I have an extension module for Python that uses SWIG as a wrapper and I try to serialize ... specification and implementation. 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 - ImportError: DLL load failed : - when trying to import psycopg2 library

>>> import psycopg2 Traceback (most recent call last): File "", line 1, in File "C:Python26libsite- ... still get the same error. 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 - Get nested dict items using Jinja2 in Flask

for this dictionary with this Flask controller projects = { 'life-calc':{'url':'life-calc', 'title': 'Life ... way to create a simple menu. See Question&Answers more detail:os...

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

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226 views

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python - What does the"wait_window" method do?

It seems that the object that calls this method waits for the window passed as parameter to be destroyed before ... should I use this method? 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 pass arbitrary arguments to a flask blueprint?

I have a flask api which I have wrapped up in an object. Doing this has made unit testing a breeze, ... pass arbitrary arguments to a blueprint. See Question&Answers more detail:os...

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

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544 views

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python - scipy equivalent for MATLAB spy

I have been porting code for an isomap algorithm from MATLAB to Python. I am trying to visualize the sparsity ... a sparse function for scipy? See Question&Answers more detail:os...

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

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219 views

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python - Iterating through constructor's arguments

I often find myself writing class constructors like this: class foo: def __init__(self, arg1, arg2, arg3): self ... for help with that version. See Question&Answers more detail:os...

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

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236 views

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python - How to change django datetime format output?

I have a datetime object. This is my template file: <ul> <li>{{ sale.validity }}</li> </ul> and the ... me out to the right direction on 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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446 views

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python - coloring cells in excel with pandas

I need some help here. So i have something like this import pandas as pd path = '/Users/arronteb/Desktop/ ... a different color, like yellow. See Question&Answers more detail:os...

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

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366 views

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python - Minimax explained for an idiot

I've wasted my entire day trying to use the minimax algorithm to make an unbeatable tictactoe AI. I missed something ... return 'O' return 'X' See Question&Answers more detail:os...

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

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389 views

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python - How to type hint a dictionary with values of different types

When declaring a dictionary as a literal, is there a way to type-hint what value I am expecting for a specific ... is helpful in debug mode). See Question&Answers more detail:os...

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

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