Recent questions tagged Python

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python - Fill in missing pandas data with previous non-missing value, grouped by key

I am dealing with pandas DataFrames like this: id x 0 1 10 1 1 20 2 2 100 3 2 200 4 1 NaN 5 ... to do this without manually looping over rows? 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 - Use of threading.Thread.join()

I am new to multithreading in python and trying to learn multithreading using threading module. I have made a very ... the output is the same. 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 plot and work with NaN values in matplotlib

I have hourly data consisting of a number of columns. First column is a date (date_log), and the rest of columns ... -1 output: Method-2 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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python - how to implement nested item in scrapy?

I am scraping some data with complex hierarchical info and need to export the result to json. I defined the items ... is driving my nuts... 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 can I install pyCurl?

I used libcurl with no problems and used pyCurl once in the past. Now i want to set it up on my machine and ... script, but I had no luck. See Question&Answers more detail:os...

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

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130 views

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python - Does a derived class automatically have all the attributes of the base class?

There seems to be no good online documentation on this: If I make a derived class, will it automatically ... to BaseClass.__init__() instead? 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 build many-to-many relations using SQLAlchemy: a good example

I have read the SQLAlchemy documentation and tutorial about building many-to-many relation but I could not figure ... list of Detail objects? 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 - Running Heroku background tasks with only 1 web dyno and 0 worker dynos

I have a Python Flask app on Heroku that serves web pages but also allows certain tasks to be launched ... q.enqueue(myfunction, myargument) 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 - Generating random text strings of a given pattern

I need to generate random text strings of a particular format. Would like some ideas so that I can code it ... number><15 character string>. 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 multiple choice

I am a newbie in Django and I would really appreciate it if you could offer me some guidance. I am trying to ... have in mind)? Thanks a lot See Question&Answers more detail:os...

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

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289 views

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python - Py2exe lxml woes

I have a wxpython application that depends on lxml and works well when running it through the python interpreter. ... to proceed after that. 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 - Factory method for objects - best practice?

This is a question regarding the best practice for creating an instance of a class or type from different forms ... in the standard library. 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

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python - What command to use instead of urllib.request.urlretrieve?

I'm currently writing a script that downloads a file from a URL import urllib.request urllib.request.urlretrieve( ... what is the replacement? See Question&Answers more detail:os...

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

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128 views

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python - set_data and autoscale_view matplotlib

I have multiple lines to be drawn on the same axes, and each of them are dynamically updated (I use set_data ... . Using matplotlib 0.99.3 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 - Adding y=x to a matplotlib scatter plot if I haven't kept track of all the data points that went in

Here's some code that does scatter plot of a number of different series using matplotlib and then adds the line y= ... out how to get that list. See Question&Answers more detail:os...

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

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307 views

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python - Django + apache & mod_wsgi: having to restart apache after changes

I configured my development server this way: Ubuntu, Apache, mod_wsgi, Python 2.6 I work on the server from ... as the production one. 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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287 views

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python - How to pass a Numpy array into a cffi function and how to get one back out?

I am developing an audio algorithm using Python and Numpy. Now I want to speed up that algorithm by implementing ... not work however. Why not? See Question&Answers more detail:os...

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

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115 views

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python - How do I add a link from the Django admin page of one object to the admin page of a related object?

To deal with the lack of nested inlines in django-admin, I've put special cases into two of the templates to ... repeating myself; what is 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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312 views

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python - How to dynamically set the queryset of a models.ModelChoiceField on a forms.Form subclass

The constructor for forms.ModelChoiceField requires a queryset. I do not know the queryset until the request happens. ... do this in django? See Question&Answers more detail:os...

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

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114 views

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python - How to "scale" a numpy array?

I would like to scale an array of shape (h, w) by a factor of n, resulting in an array of shape (h*n, ... 's the most efficient way to do 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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406 views

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python - Replace special characters with ASCII equivalent

Is there any lib that can replace special characters to ASCII equivalents, like: "Cze??" to: "Czesc" I ... function that already does that. See Question&Answers more detail:os...

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

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223 views

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python - Upgrading python3.4 to python3.6 on ubuntu breaks pip

I'm attempting to install python3.6 on my machine after I currently have python3.4. However, after installation trying ... how I could fix 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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185 views

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python - Parse http GET and POST parameters from BaseHTTPHandler?

BaseHTTPHandler from the BaseHTTPServer module doesn't seem to provide any convenient way to access http request ... full web framework. See Question&Answers more detail:os...

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

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233 views

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python - How to make Django's devserver public ? Is it generally possible?

I'm currently trying out the Django framework and I would share/present/show some stuff I've made to my ... make runserver usable outside too See Question&Answers more detail:os...

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

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637 views

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python - How can I make a Django form field contain only alphanumeric characters

I have this model name = models.CharField(max_length=50, blank=True, null=True) email = models.EmailField(max_length= ... . Is there any 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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203 views

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python - How to print a Numpy array without brackets?

I want to convert a = [1,2,3,4,5] into a_string = "1 2 3 4 5". The real numpy array is quite big ( ... so I assume using for loops is too slow. See Question&Answers more detail:os...

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

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212 views

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python - Saving best model in keras

I use the following code when training a model in keras from keras.callbacks import EarlyStopping model = Sequential() ... to help with that? See Question&Answers more detail:os...

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

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169 views

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python - Set vs. frozenset performance

I was tinkering around with Python's set and frozenset collection types. Initially, I assumed that frozenset ... look into the implementations. See Question&Answers more detail:os...

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

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