Recent questions tagged PYTHON

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python - How to replace __str__ for a function

I want to change the string representation of a python function to be just the function name. Eg for some ... change __str__ for a function? See Question&Answers more detail:os...

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

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487 views

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python - Bulk update in Pymongo using multiple ObjectId

I want to update thousands of documents in mongo collection. I want to find them using ObjectId and then whichever ... pymongo = 3.2.1. See Question&Answers more detail:os...

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

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270 views

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python - What is the fastest way to map group names of numpy array to indices?

I'm working with 3D pointcloud of Lidar. The points are given by numpy array that looks like this: points = ... '] to check performance time. See Question&Answers more detail:os...

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

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457 views

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python - XPath: select tag with empty value

How I can find in XPath 1.0 all rows with empty col name="POW"? <row> <col name="WOJ">02</col> <col name="POW"/> <col ... ---------------------" See Question&Answers more detail:os...

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

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601 views

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python - Django post save signal getting called twice despite uid

I have registered my signal with the callback using the @receiver decorator @receiver(post_save, sender=User, ... twice. Any suggestions? See Question&Answers more detail:os...

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

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510 views

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python - How can I generate a colormap array from a simple array in matplotlib

In some functions of matplotlib, we have to pass an color argument instead of a cmap argument, like bar3d. ... as np from matplotlib import cm See Question&Answers more detail:os...

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

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594 views

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python - transform the upper/lower triangular part of a symmetric matrix (2D array) into a 1D array and return it to the 2D format

In this question it is explained how to access the lower and upper triagular parts of a given matrix, say: m = ... loop to rebuild the 2D array? See Question&Answers more detail:os...

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

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603 views

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python - How to add Headers to Scrapy CrawlSpider Requests?

I'm working with the CrawlSpider class to crawl a website and I would like to modify the headers that ... to modify request headers dynamically? See Question&Answers more detail:os...

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

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448 views

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python - How does pytorch broadcasting work?

torch.add(torch.ones(4,1), torch.randn(4)) produces a Tensor with size: torch.Size([4,4]). Can someone provide a logic behind 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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333 views

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python - Calling chains methods with intermediate results

I have a class and some methods of it. Could I keep a result of the methods between calling. Example ... anything to decide above example? See Question&Answers more detail:os...

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

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803 views

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python - tick label positions for matplotlib 3D plot

I am trying to work out how to set/correct the position of tick labels for a 3D matplotlib plot. Tick ... to align with the tick positions? See Question&Answers more detail:os...

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

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467 views

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python - Pandas Dataframe: how to add column with number of occurrences in other column

I have to following df: Col1 Col2 test Something test2 Something test3 Something test Something test2 Something test5 ... column full of 'NaN' See Question&Answers more detail:os...

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

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373 views

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python - ValueError: need more than 1 value to unpack

Disclaimer: I have read the thread located at Python Error: "ValueError: need more than 1 value to unpack", and ... Thanks for bearing with me. See Question&Answers more detail:os...

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

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317 views

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python - Pandas: Why is default column type for numeric float?

I am using Pandas 0.18.1 with python 2.7.x. I have an empty dataframe that I read first. I ... ur_y float64 polygon_count float64 dtype: object See Question&Answers more detail:os...

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

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240 views

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python - Should I subclass list or create class with list as attribute?

I need a container that can collect a number of objects and provides some reporting functionality on the container's elements ... a no-no. Why? See Question&Answers more detail:os...

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

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343 views

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python - Renaming models(tables) in Django

so I've already created models in Django for my db, but now want to rename the model. I've change the ... (self): return self.name Cheers See Question&Answers more detail:os...

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

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836 views

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python - How to draw a GdkPixbuf using GTK3 and PyGObject

I have a small application that uses a DrawingArea to draw a simple map using PyGObject and GTK3. I load a Pixbuf ... . What am I doing wrong? See Question&Answers more detail:os...

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

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1.0k views

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python - How to mount google drive to R notebook in colab?

I have an R notebook in colab where I want to read a file which is saved in my google drive. I only ... would very much appreciate the 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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659 views

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python - Location of stored offline data for cartopy

Where is offline data stored in cartopy? Is it stored in the data folder under site-packages? Is there any way ... the data from there. 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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520 views

1 answer

python - Different Results in Go and Pycrypto when using AES-CFB

I am adding a go application to an already existing python codebase. I've been having trouble dealing with ... AES settings & key size. 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

1 answer

python - Selenium Scroll inside of popup div

I am using selenium and trying to scroll inside the popup div on instagram. I get to a page like 'https:/ ... (0, document.body.scrollHeight);") See Question&Answers more detail:os...

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

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661 views

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python - parsing a dictionary in a pandas dataframe cell into new row cells (new columns)

I have a Pandas Dataframe that contains one column containing cells containing a dictionary of key:value ... Suggestions much appreciated. 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 - How do I mock the hierarchy of non-existing modules?

Let's assume that we have a system of modules that exists only on production stage. At the moment of testing these ... . I just cannot find 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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283 views

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python - Select rows of pandas dataframe from list, in order of list

The question was originally asked here as a comment but could not get a proper answer as the question was ... abovementioned goal be achieved? See Question&Answers more detail:os...

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

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327 views

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python - Fixed-point arithmetic

Does anyone know of a library to do fixed point arithmetic in Python? Or, does anyone has sample code? See Question&Answers more detail:os...

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

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271 views

1 answer

python - Lambdas inside list comprehensions

I wanted to have a list of lambdas that act as sort of a cache to some heavy computation and noticed this: >>> [j() for j ... 9, 9, 9, 9, 9, 9] See Question&Answers more detail:os...

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

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491 views

1 answer

python - werkzeug.security generate_password_hash alternative without SHA-1

I use generate_password_hash from werkzeug.security to hash and salt my passwords. I recently saw ... generate_password_hash(secret) See Question&Answers more detail:os...

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

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497 views

1 answer

python - Can I create a local numpy random seed?

There is a function, foo, that uses the np.random functionality. I want to control the seed that foo uses, but ... or am I missing 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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