Recent questions tagged Python

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python - Why is a `for` loop so much faster to count True values?

I recently answered a question on a sister site which asked for a function that counts all even digits of a number. ... the time str(n) takes: 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 - Checking if particular value (in cell) is NaN in pandas DataFrame not working using ix or iloc

Lets say I have following pandas DataFrame: import pandas as pd df = pd.DataFrame({"A":[1,pd.np.nan,2], "B ... for NaN values using ix or iloc? See Question&Answers more detail:os...

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

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161 views

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python - jinja2 - how to put a block in an if statement?

I am trying to use an if to determine which block should fill my {% block content %}. I have a base.html ... put a block inside an if statement? 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 - How to clear/delete the contents of a Tkinter Text widget?

I am writing a Python program in TKinter on Ubuntu to import and print the name of files from particular folder ... 'italic')) root.mainloop() See Question&Answers more detail:os...

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

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596 views

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python - numpy subtract every row of matrix by vector

So I have a n x d matrix and an n x 1 vector. I'm trying to write a code to subtract every row in the ... so that I don't need a for loop? 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 list all fields of a class (and no methods)?

Suppose o is a Python object, and I want all of the fields of o, without any methods or __stuff__. How can this ... even if I get this to work. See Question&Answers more detail:os...

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

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193 views

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python - Installing OpenCV fails because it cannot find "skbuild"

I have a docker image that I need to install openCV in it and from yesterday it started to fail because it ... build. CMake executable is cmake See Question&Answers more detail:os...

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

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210 views

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python - The role defined for the function cannot be assumed by Lambda

I'm getting the error "The role defined for the function cannot be assumed by Lambda" when I'm trying to ... -timeout 15 --memory-size 512 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 - Paramiko : Error reading SSH protocol banner

Recently, I made a code that connect to work station with different usernames (thanks to a private key) based on ... any way to 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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python - Importing correctly with pytest

I just got set up to use pytest with Python 2.6. It has worked well so far with the exception of handling ... open for answers of these kinds. See Question&Answers more detail:os...

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

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202 views

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python - A safe max() function for empty lists

Evaluating, max_val = max(a) will cause the error, ValueError: max() arg is an empty sequence Is there ... except ValueError: max_val = default See Question&Answers more detail:os...

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

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251 views

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python - U-net low contrast test images, predict output is grey box

I am running the unet from https://github.com/zhixuhao/unet but when I run the unet the predicted images are ... . Many thanks in advance Helena See Question&Answers more detail:os...

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

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211 views

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python 2.7 - Merge pandas DataFrames based on irregular time intervals

I'm wondering how I can speed up a merge of two dataframes. One of the dataframes has time stamped data ... above does not make that clear. See Question&Answers more detail:os...

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

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231 views

1 answer

python - Can I read multiple files into a Spark Dataframe from S3, passing over nonexistent ones?

I would like to read multiple parquet files into a dataframe from S3. Currently, I'm using the following ... complaining. Is this 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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347 views

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python - OpenCV dot target detection not finding all targets, and found circles are offset

I'm trying to detect the center of black/white dot targets, like in this picture. I've tried to use the cv2 ... " And this is my current output: See Question&Answers more detail:os...

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

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171 views

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python - TFRecordReader seems extremely slow , and multi-threads reading not working

My training process use tfrecord format for train&eval dataset. I test the benchmark of reader , only 8000records/second. ... are 24 core cpus. See Question&Answers more detail:os...

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

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125 views

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python - dataframe representation of a rolling window

I want a dataframe representation of of a rolling window. Instead of performing some operation on a rolling window, I want ... =[0, 1]).dropna() 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 - OpenCV: setting all pixels of specific BGR value to another BGR value

I am using OpenCV with Python. I have an image, and what I want to do is set all pixels of BGR value ... there an efficient way to handle 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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739 views

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python - How can I fetch emails via POP or IMAP through a proxy?

Neither poplib or imaplib seem to offer proxy support and I couldn't find much info about it despite my google-fu ... rather avoid it if I can. 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 - How to generate random numbers with predefined probability distribution?

I would like to implement a function in python (using numpy) that takes a mathematical function (for ex. p(x) ... how this is doable in python? See Question&Answers more detail:os...

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

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393 views

1 answer

python - Resize image maintaining aspect ratio AND making portrait and landscape images exact same size?

Currently I am using: os.chdir(album.path) images = glob.glob('*.*') # thumbs size size = 80,80 for image ... to 80px (will be more than 80px) See Question&Answers more detail:os...

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

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425 views

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python - Windows 10 and Unable to find vcvarsall.bat

When I try to build one package: C:LinterintlibPYTHON>python setup.py build I get this error message: running build ... , I need help. Thanks! See Question&Answers more detail:os...

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

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256 views

1 answer

python - How to map multiple lists to one dictionary?

I used this code: dictionary = dict(zip(list1, list2)) in order to map two lists in a dictionary. Where: ... . Is something like this 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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348 views

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python - Using one Scrapy spider for several websites

I need to create a user configurable web spider/crawler, and I'm thinking about using Scrapy. But, I can't ... and the spider reads it somehow. See Question&Answers more detail:os...

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

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464 views

1 answer

python - How to intercept instance method calls?

I am looking for a way to intercept instance method calls in class MyWrapper below: class SomeClass1: def a1(self): ... ) print result == 'a1a2' See Question&Answers more detail:os...

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

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138 views

1 answer

python - Return the column name(s) for a specific value in a pandas dataframe

where I have found this option in other languages such as R or SQL but I am not quite sure how to go about ... the best way of doing so? Thanks See Question&Answers more detail:os...

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

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284 views

1 answer

python - How to combine OpenCV with PyQt to create a simple GUI?

I need to perform lot of operations on an image. So I used OpenCV. OpenCV is very efficient in image processing, ... 2 codes to reach my goal? See Question&Answers more detail:os...

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

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420 views

1 answer

python - How to stop a QThread from the GUI

This is a follow up question to a previous one I posted earlier. The problem is how to stop (terminate|quit|exit) ... () sys.exit(app.exec_()) See Question&Answers more detail:os...

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

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