Recent questions tagged Python

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python - dict.get() method returns a pointer

Let's say I have this code: my_dict = {} default_value = {'surname': '', 'age': 0} # get info about john ... way to do it. Any ideas, comments? See Question&Answers more detail:os...

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

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428 views

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python - Pandas DataFrame with tuple of strings as index

I'm sensing some weird pandas behavior here. I have a dataframe that looks like df = pd.DataFrame(columns=[' ... this is not recommended usage. 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 recarray strings of variable length

Is it possible to initialise a numpy recarray that will hold strings, without knowing the length of the ... some ridiculous upper limit)? 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 - Django: list all reverse relations of a model

I would like my django application to serve a list of any model's fields (this will help the GUI build ... idea, tips are welcome! 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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python - Register Celery Class-based Task

Python 3.x, Celery 4.x... I have a class-based task. myproj/celery.py from celery import Celery # ... message has been ignored and discarded. See Question&Answers more detail:os...

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

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360 views

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python - How can I restrict the scope of a multiprocessing process?

Using python's multiprocessing module, the following contrived example runs with minimal memory requirements: import ... be copies... See Question&Answers more detail:os...

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

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405 views

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python - get text after specific tag with beautiful soup

I have a text like page.content = "<body><b>Title:</b> Test title</body>" I can get the Title tag ... that element, and not the body element. 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 do we call a normal function where a coroutine is expected?

Consider a coroutine which calls into another coroutine: async def foo(bar): result = await bar() return result ... that bar can be awaited. 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 - Multiple if statements in a lambda function

I am trying to use 3 if statements within a python lambda function. Here is my code: y=lambda symbol: 'X ... would really appreciate any 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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python - Django Admin Show / Hide Fields If Specific Value Is Selected In A Dropdown

In the Django admin, when the choice Custom is selected from a dropdown list, I want to display ... .register(DropdownModel, DropdownModelAdmin) See Question&Answers more detail:os...

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

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615 views

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python - How to find most frequent values in numpy ndarray?

I have a numpy ndarray with shape of (30,480,640), the 1th and 2th axis representing locations(latitude ... most frequent values? Thanks again. See Question&Answers more detail:os...

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

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441 views

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python - Wrap text in PIL

I'm using PIL to draw text on an image. How would I wrap a string of text. This is my code: text = "Lorem ... ") image.save("/tmp/image.jpg") 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 - Pandas Rolling Apply custom

I have been following a similar answer here, but I have some questions when using sklearn and rolling apply. ... but not explained variance. See Question&Answers more detail:os...

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

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585 views

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python - ValueError: unknown url type in urllib2, though the url is fine if opened in a browser

Basically, I am trying to download a URL using urllib2 in python. the code is the following: import ... with subsequent string concatenation? See Question&Answers more detail:os...

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

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328 views

1 answer

python - Syntax for an If statement using a boolean

I just recently joined the python3 HypeTrain. However I just wondered how you can use an if statement onto a ... states False from now on? See Question&Answers more detail:os...

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

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644 views

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python - Can't remove a folder with os.remove (WindowsError: [Error 5] Access is denied: 'c:/temp/New Folder')

I'm working on a test case for which I create some subdirs. However, I don't seem to have the permission ... anybody know what's going 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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477 views

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python - Pandas sum multiple dataframes

I have multiple dataframes each with a multi-level-index and a value column. I want to add up all the dataframes on the ... a 2 b 4 c NaN d 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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313 views

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python - How to import a csv-file into a data array?

I have a line of code in a script that imports data from a text file with lots of spaces between values into an ... , 0, row_data) row += 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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696 views

1 answer

python - pandas: convert index type in multiindex dataframe

Hi have a multiindex dataframe: tuples = [('YTA_Q3', 1), ('YTA_Q3', 2), ('YTA_Q3', 3), ('YTA_Q3', ... df1.index.astype(str) returns a TypeError See Question&Answers more detail:os...

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

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263 views

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python - How do I run an action for all requests in Flask?

I have some code I want to run for every request that comes into Flask-- specifically adding some analytics ... before or after each view? See Question&Answers more detail:os...

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

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384 views

1 answer

python - How to add something to PYTHONPATH?

I downloaded a package (called pysolr 2.0.15) to my computer to be used with Haystack. The instructions asks me ... else? Thanks for 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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414 views

1 answer

python - What is the difference between save a pandas dataframe to pickle and to csv?

I am learning python pandas. I see a tutorial which shows two ways to save a pandas dataframe. pd.to_csv('sub. ... csv or txt or other format? 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 - Why would I want to use itertools.islice instead of normal list slicing?

It seems to me that many functions in the itertools module have easier equivalents. For example, as far as ... to choose itertools besides 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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392 views

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python - Elegant ways to return multiple values from a function

It seems like in most mainstream programming languages, returning multiple values from a function is an extremely ... languages are welcome. See Question&Answers more detail:os...

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

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275 views

1 answer

python - How to get the current Linux process ID from the command line a in shell-agnostic, language-agnostic way

How does one get their current process ID (pid) from the Linux command line in a shell-agnostic, language- ... what $$ delivers in Bash. See Question&Answers more detail:os...

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

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352 views

1 answer

python - How to "embed" a small numpy array into a predefined block of a large numpy array?

I have a small NXN array "block" that I want to plug into a specified region (i.e., a diagonal region at "start ... start:start+N] = block[i][:] See Question&Answers more detail:os...

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

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319 views

1 answer

python - M2Crypto doesn't install in venv, or swig doesn't define __x86_64__ which breaks compiling against OpenSSL

I'm trying to install the Python M2Crypto package into a virtualenv on an x86_64 RHEL 6.1 machine. This process ... would be a good thing. See Question&Answers more detail:os...

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

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468 views

1 answer

python - Subtract values in one list from corresponding values in another list

I have two lists: A = [2, 4, 6, 8, 10] B = [1, 3, 5, 7, 9] How do I subtract each value in one list from ... that: C = [1, 1, 1, 1, 1] 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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