Recent questions tagged Python

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python - Getting black plots with plt.imshow after multiplying RGB image array by a scalar

So I am a bit confused as to why this is happening. I have a binary image: Now I want to convert this ... when multiplied by 255 Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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299 views

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python - Regex not start with dot or end with dot

I need a regular expression that does not start with a dot or end with [-_.]. This regex works but fails for ... be a valid string but it fails. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Creating JSON type Column in SQLite with sqlalchemy

Is it possible to create JSON type Column in SQLite with sqlalchemy? I've tried import sqlalchemy.types as types .. ... ] SQLite version 3.16.0 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Find all Key-Elements by the same Value in Dicts

I have question about Dictionaries in Python. here it is: I have a dict like dict = { 'abc':'a', 'cdf':'b', 'gh':' ... ,'gh'), 'g':('fh','hfz')} See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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766 views

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python - Copy image to clipboard?

First of all, the question on SO copy image to clipboard in python leads to answer Write image to ... (win32clipboard.CF_DIB, data) Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Returning probabilities in a classification prediction in Keras?

I am trying to make a simple proof-of-concept where I can see the probabilities of different classes for a ... is this feature not available? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Change specific RGB color pixels to another color, in image file

I would like to change a single color with Python. If a fast solution with PIL exists, I would prefer this ... '#939393' MyImage.png MyImage.png See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - conditional row read of csv in pandas

I have large CSVs where I'm only interested in a subset of the rows. In particular, I'd like to read ... reading the csv (no skipfooter please) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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447 views

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python - How to get BeautifulSoup 4 to respect a self-closing tag?

This question is specific to BeautifulSoup4, which makes it different from the previous questions: Why is BeautifulSoup ... /body> </html> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Fit a curve for data made up of two distinct regimes

I'm looking for a way to plot a curve through some experimental data. The data shows a small linear ... they would be greatly appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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448 views

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python - Why doesn't pytz localize() produce a datetime object with tzinfo matching the tz object that localized it?

Is there anyone who can help me understand what's going on here? import pytz from datetime import datetime ... timezones. Can anyone explain? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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444 views

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python - saving an 'lxml.etree._ElementTree' object

I've spent the last couple of days getting to grips with the basics of lxml; in particular using lxml.html to parse ... 2.3.2, snow-leopard)) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python regex error: unbalanced parenthesis

I pretty new to python, so i have a dictionary with some keys in it, and a string. I have to replace ... the problem. Any help is appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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299 views

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python - How can I pass arguments to Tkinter button's callback command?

I got 2 buttons, respectively named 'ButtonA', 'ButtonB'. I want the program to print 'hello, ButtonA' and ' ... pass ButtonA's text to lambda? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - from_logits=True and from_logits=False get different training result for tf.losses.CategoricalCrossentropy for UNet

I am doing the image semantic segmentation job with unet, if I set the Softmax Activation for last layer like this: ... and see what i said. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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179 views

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python - Connect to S3 data from PySpark

I am trying to read a JSON file, from Amazon s3, to create a spark context and use it to process the ... and awsAccessId. Whats going wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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398 views

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python - tabular legend layout for matplotlib

I have a plot with 9 lines, representing datasets with two varying parameters, say f_11, f_12, f_13, . ... (crosspossted from matplotlib-users) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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144 views

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python - Training broke with ResourceExausted error

I am new to tensorflow and Machine Learning. Recently I am working on a model. My model is like below, ... Why not at the initial epoch. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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208 views

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python - Auto-Loading a module on IPython startup

I'm trying to to auto load the division module from __future__ on startup, i've currently got a simple ... help would be appreciated, thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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475 views

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python - Convert Pandas Dataframe to Float with commas and negative numbers

I've read several posts about how to convert Pandas columns to float using pd.to_numeric as well as applymap(locale ... has no attribute 'str' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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144 views

1 answer

python - OpenCV load video from url

I have a video file (i.e. https://www.example.com/myvideo.mp4) and need to load it with OpenCV. Doing ... OpenCV...if such a solution exists. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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232 views

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python .count for multidimensional arrays (list of lists)

How would I count the number of occurrences of some value in a multidimensional array made with nested lists? as ... runtime)) .count maybe? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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195 views

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python - Keras LSTM predicted timeseries squashed and shifted

I'm trying to get some hands on experience with Keras during the holidays, and I thought I'd start out with the ... and I can't figure out why. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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279 views

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python - Interpolating data from a look up table

read the look up table LUT = np.genfromtxt('test.out', delimiter=',', dtype=float) LUT: 12, 25, 136, ... the results between 1st and 2nd row? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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169 views

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python - Convert binary (0|1) numpy to integer or binary-string?

Is there a shortcut to Convert binary (0|1) numpy array to integer or binary-string ? F.e. b = np.array([0,0,0 ... to01(), 2 ) which is ugly !!! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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632 views

1 answer

python - Appending pandas Data Frame to Google spreadsheet

Case: My script returns a data frame that needs has to be appended to an existing google spreadsheet as ... rather than multiple single rows? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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159 views

1 answer

python - How can I transform blocks into a blockdiagonal matrix (NumPy)

I have three same-size square matrices in NumPy. I would like to combine these to a block-diagonal matrix. Example: ... the best way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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240 views

1 answer

python - Count occurrences of items in Series in each row of a DataFrame

I have a pandas.DataFrame that looks like this. COL1 COL2 COL3 C1 None None C1 C2 None C1 C1 None C1 C2 ... achieve this in a compact fashion? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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