Recent questions tagged PYTHON

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python 3.x - How to output x265 compressed video with cv2.VideoWriter

I'm doing some rendering on a 45-min 1.2GB video 80,0000 frames of size 1344x756 each and the video is ... quality and the lowest size possible. 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 - AttributeError: 'module' object has no attribute 'startfile'

Trying to run this program, I got this error: Traceback (most recent call last): File "piltk.py", line 84, in ... 'startfile' How to fix 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 - Calculate rotation matrix to align two vectors in 3D space?

I have two separate vectors of 3D data points that represent curves and I'm plotting these as scatter data in a ... green vector to the blue. 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 - The ability to apply multiple formats to cell with xlwt / openpyxl

I plan to use one of 2 libraries below to output excel file in python: xlwt ( http://www.python-excel. ... and Fernando in regular text style. See Question&Answers more detail:os...

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

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625 views

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python - Scrapy 404 error: HTTP status code is not handled or not allowed

I'm trying to scrape the site coursetalk using scrapy, I'm trying with the spider template first and getting ... INFO: Closing spider (finished) See Question&Answers more detail:os...

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

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320 views

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python - How to classify continuous audio

I have a audio data set and each of them has different length. There are some events in these audios, that ... so appreciated if anyone helps. 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 - Dropdown menu for Plotly Choropleth Map Plots

I am trying to create choropleth maps. Below is an example that works: df = px.data.gapminder().query(" ... via fig.update_layout or something? 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 - Convert and pad a list to numpy array

I have an arbitrarily deeply nested list, with varying length of elements my_list = [[[1,2],[4]],[[4,4,3]],[[1,2 ... , nan]]]) How do I 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 - Why doesn't this loop display an updated object count every five seconds?

I use this python code to output the number of Things every 5 seconds: def my_count(): while True: print ... .count() without being restarted? 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 can I set a minimum distance constraint for generating points with numpy.random.rand?

I am trying to generate an efficient code for generating a number of random position vectors which I then use to ... use a lot of points. See Question&Answers more detail:os...

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

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286 views

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python - Numpy equivalent of if/else list comprehension

Is there a numpy way of doing n = [x-t if x > 0 else x for x in nps] similar to this n = np.array(a) n[np ... like this perhaps? n[n > 0] = n-t 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 - Why doesn't my simple pytorch network work on GPU device?

I built a simple network from a tutorial and I got this error: RuntimeError: Expected object of type torch.cuda. ... device) out = net(inputs) 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 - Setting python3.2 as default instead of python2.7 on Mac OSX Lion 10.7.5

Currently running Mac OS X Lion 10.7.5 , and it has python2.7 as default. In the terminal, i type 'python' ... python3.2. How do i change that? See Question&Answers more detail:os...

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

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290 views

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python - Is there a faster way to convert an arbitrary large integer to a big endian sequence of bytes?

I have this Python code to do this: from struct import pack as _pack def packl(lnum, pad = 1): if lnum ... quickly that the method given above. See Question&Answers more detail:os...

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

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527 views

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python - Difference between two unix timestamps

I have two timestamps in miliseconds and i want to compute the difference between the two in minutes: d1 = ... two in minutes . Please 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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1.2k views

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python - Matplotlib: xticks every 15 minutes, starting on the hour

I am trying to plot values of temperature against time with the time formatted as HH:MM. I am able ... [0].xaxis.set_major_formatter(xformatter) See Question&Answers more detail:os...

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

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350 views

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python - Why does multiplication repeats the number several times?

I don't know how to multiply in Python. If I do this: price = 1 * 9 It will appear like this: ... How can I make it multiply 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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1.6k views

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python - pandas - 'dataframe' object has no attribute 'str'

I am trying to filter out the dataframe that contains a list of product. However, I am getting the pandas - 'dataframe' ... .0 0.0 0.0 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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139 views

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python - ImportError: No module named package

I found importing modules in Python complicated, so I'm doing experiments to clear it up. Here is my file ... package Package in __init__.py 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 3.x - Neural Network to predict nth square

I am trying to use multi-layer neural network to predict nth square. I have the following training data containing ... right 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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292 views

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python - CPython string addition optimisation failure case

The Question Why, in CPython, does def add_string(n): s = '' for _ in range(n): s += ' ' take linear time, but def ... ()] l[0] += None #>>> 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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356 views

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python - Pandas groupby to find percent True and False

I have a column of sites: ['Canada', 'USA', 'China' ....] Each site occurs many times in the SITE column ... each site which won't help me here. 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 use Paramiko getfo to download file from SFTP server to memory to process it

I am trying to download a CSV file (in-memory) from SFTP using Paramiko and import it into a pandas dataframe ... it if someone could 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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300 views

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python - How to save a 3 channel numpy array as image

I have a numpy array with shape (3, 256, 256) which is a 3 channel (RGB) image of resoulution 256x256. ... an image of dimensions 256x3 to disk See Question&Answers more detail:os...

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

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478 views

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python - Best way to isolate one coefficient of a multivariate polynomial in sympy

I have a multivariate polynomial (which in the general case many many variables) whose coefficients list some data that I ... a 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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500 views

1 answer

python - Kivy: Changing screens in screen manager with an on_press event

I would like to know how to change screens using an on_press event binded to a button, without using a KV ... achieve the same using a button. See Question&Answers more detail:os...

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

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265 views

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python - How to "Merge" Sequential models in Keras 2.0?

I am trying to merge two Sequential models In Keras 2.0, using the following line: merged_model.add(Merge([ ... the layer should be tensors. See Question&Answers more detail:os...

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

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189 views

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python - String contains any character in group?

I have a set of characters: ,/,?,% etc. I also have a string, lets say "This is my string % my ... and inefficient. Is there a better 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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