Recent questions tagged Python

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python - Process data, much larger than physical memory, in chunks

I need to process some data that is a few hundred times bigger than RAM. I would like to read in a large ... to make this efficient 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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python - Swapping Columns with NumPy arrays

When I have a=1 and b=2, I can write a,b=b,a so that a and b are interchanged with each other. I use this ... x[:,2]. Why is this the case? 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 - Pyinstaller numpy "Intel MKL FATAL ERROR: Cannot load mkl_intel_thread.dll"

I'm new with python apps. I'm trying to build my python GUI app with pyinstaller. My app depends on the ... the same error Thanks for your 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 - Converting Pandas DataFrame to Orange Table

I notice that this is an issue on GitHub already. Does anyone have any code that converts a Pandas DataFrame to an Orange ... 3 63 4.5 3 1 male 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 - Difference between decorator classes and decorator functions

I guess that's how they are called, but I will give examples just in case. Decorator class: class ... Is there any practical difference? 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 - pyPdf for IndirectObject extraction

Following this example, I can list all elements into a pdf file import pyPdf pdf = pyPdf.PdfFileReader(open(" ... under pyPdf of course)?? 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 make a tkinter canvas rectangle with rounded corners?

I would like to create a rectangle with rounded corners. I'm using canvas from tkinter. 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 - Tips for properly using large broadcast variables?

I'm using a broadcast variable about 100 MB pickled in size, which I'm approximating with: >>> data = list(range ... (id).distinct().count() 2 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 3.x - SSL: CERTIFICATE_VERIFY_FAILED with urllib

I'm running into trouble with the module urllib (Python 3.6). Every time I use the module, I get a page ... 's off with the module itself. 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 - Get max value index for a list of dicts

I'm trying to get the index of the dictionary with the max 'size' in a list of dictionaries like the ... index(max_val)) is this correct? 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 does one append large amounts of data to a Pandas HDFStore and get a natural unique index?

I'm importing large amounts of http logs (80GB+) into a Pandas HDFStore for statistical processing. Even ... hdf_output.append(KEY_NAME, df) 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 - Pickle a dynamically parameterized sub-class

I have a system which commonly stores pickled class types. I want to be able to save dynamically-parameterized ... in a relatively clean 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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180 views

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python - Convert a column of timestamps into periods in pandas

I have a column of timestamps that need to be converted into period ('Month'). e.g. 1985-12-31 00:00:00 to ... can it be done in numpy? 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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326 views

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python - Load nodes with attributes and edges from DataFrame to NetworkX

I am new using Python for working with graphs: NetworkX. Until now I have used Gephi. There the standard steps ... the DataFrame and the nodes? 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 form with multiple file fields

How do you handle multiple file fields in Django. For example if I had only one form field i would pass the ... go when there are more files? See Question&Answers more detail:os...

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

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554 views

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python - flask - blueprint - sqlalchemy - cannot import name 'db' into moles file

I'm new in bluprint, and have problem with importing db into mydatabase.py file which is models file. I've faced ... .link + "}" Any solution? 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 I select from multiple tables in one query with Django?

I have two tables, one "Company" and one "Employee": class Company(models.Model): name = models.CharField ... cached and considered "optimized"? 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 include dependencies from venv directory when running pyinstaller for project built in Pycharm?

I'm new to Python and PyCharm. I'm running on OSX High Sierra. I've created a project in PyCharm that uses ... analyze.py It didn't 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 - Convert numpy array to PySide QPixmap

I want to convert an image into a NumPy array to a PySide QPixmap, so I can display it (EDIT: in my ... do this or are there any alternatives? 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 I generate dynamic fields in WTForms

I am trying to generate a form in WTForms that has dynamic fields according to this documentation http:// ... accomplish this in WTForms? 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 3.x - Error on import matplotlib.pyplot (on Anaconda3 for Windows 10 Home 64-bit PC)

I recently installed "Anaconda3 for Windows v2.4.0" on my Windows 10 Home (64 bit) machine. (I downloaded ... fix or workaround.) Thanks, Anshul See Question&Answers more detail:os...

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

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257 views

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python - marshal dumps faster, cPickle loads faster

I'm implementing a program that needs to serialize and deserialize large objects, so I was making some tests ... with cPickle fast loading? 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 - Get the error code from tweepy exception instance

I'm new to python and I'm trying to use a library. It raises an exception, and I am trying to identify which ... I have no idea what to try. 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 - Have multiple commands when button is pressed

I want to run multiple functions when I click a button. For example I want my button to look like ... make command execute multiple functions. See Question&Answers more detail:os...

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

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287 views

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python - Scrapy and response status code: how to check against it?

I'm using scrapy to crawl my sitemap, to check for 404, 302 and 200 pages. But i can't seem to be ... the 302 requests and save those urls? See Question&Answers more detail:os...

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

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395 views

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python - Unittest causing sys.exit()

No matter what I do sys.exit() is called by unittest, even the most trivial examples. I can't tell if my install ... .exit(2) SystemExit: 2 >>> See Question&Answers more detail:os...

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

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332 views

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python - how to create a group ID based on 5 minutes interval in pandas timeseries?

I have a timeseries dataframe df looks like this (the time seris happen within same day, but across ... are highly appreciated. 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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python - Django Background Task

I need to populate a SQLite database every few minutes in Django, but I want to serve stale data ... without running into threading issues? See Question&Answers more detail:os...

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

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