Recent questions tagged Python

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python - sklearn LogisticRegression and changing the default threshold for classification

I am using LogisticRegression from the sklearn package, and have a quick question about classification. I built a ROC ... seem to get anywhere. 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 - Calculate sklearn.roc_auc_score for multi-class

I would like to calculate AUC, precision, accuracy for my classifier. I am doing supervised learning: Here ... format is not supported 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 - sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table

I am fresh to flask and was trying to build a blog on my own, and I ran into an issue with SQLite operation ... == '__main__': manager.run() 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 - Conjugate transpose operator ".H" in numpy

It is very convenient in numpy to use the .T attribute to get a transposed version of an ndarray. However, ... about the .I inverse operator.) 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 - Metaclass Mixin or Chaining?

Is it possible to chain metaclasses? I have class Model which uses __metaclass__=ModelBase to process its namespace dict. I ... .washere == 'A!' 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 REST Framework - Serializing optional fields

I have an object that has optional fields. I have defined my serializer this way: class ProductSerializer(serializers ... fields, that is. 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 - PyCharm does not recognize modules installed in development mode

I have two pure python projects in PyCharm 3.4.1 Professional Edition. The first one, let's call it ... regarding the used python environment? 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 - PyQt5: How to install/run Qt Designer

Feeling really stupid, right now, but the title says it all: How do you start the QtDesigner? I've installed ... like what I'm looking for. 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 - Pandas DataFrame: apply function to all columns

I can use .map(func) on any column in a df, like: df=DataFrame({'a':[1,2,3,4,5,6],'b':[2,3 ... all columns or the entire frame (without a 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 - TypeError: bad operand type for unary ~: float

df = df[~df["column"].str.contains("Total")] TypeError: bad operand type for unary ~: 'float' Why does . ... float? What should I be doing here? 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 'is not' operator

I notice there is a comparison operator is not. Should I literally translate it into != instead of == 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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python - Multiplying a tuple by a scalar

I have the following code: print(img.size) print(10 * img.size) This will print: (70, 70) (70, 70, ... if that matters anything in this 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 - How do I handle login in flask with multiple blueprints?

I have multiple blueprints that needs to be integrated into a single app. I'm using flask-login to handle ... you for reading and answering 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 - nltk language model (ngram) calculate the prob of a word from context

I am using Python and NLTK to build a language model as follows: from nltk.corpus import brown from nltk. ... anyone help me out? 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 - matplotlib imshow plots different if using colormap or RGB array

I am having the following problem: I am saving 16-bit tiff images with a microscope and I need to analyze ... very much for your collaboration. 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 set a window icon with PyQt5?

from PyQt5 import QtWidgets, QtGui from PyQt5.QtWidgets import * from PyQt5.QtCore import * class Application(QMainWindow) ... 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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python - Iterating over related objects in Django: loop over query set or use one-liner select_related (or prefetch_related)

I have a newsletter application where a newsletter has multiple articles within each issue. I want to display a summary ... a faster way. TIA. See Question&Answers more detail:os...

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

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423 views

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python - How do I set up Scrapy to deal with a captcha

I'm trying to scrape a site that requires the user to enter the search value and a captcha. I've got an ... the ideal Scrapy way of doing 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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python - Converting a django ValuesQuerySet to a json object

I'm trying to use the ValuesQuerySet feature in Django to limit the number of fields returned from query to only ... serialize, line 41 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 - How to get the WordNet synset given an offset ID?

I have a WordNet synset offset (for example id="n#05576222"). Given this offset, how can I get the synset using 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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370 views

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python - Plotting a Pandas DataSeries.GroupBy

I am new to python and pandas, and have the following DataFrame. How can I plot the DataFrame where each ... ('ModelID').plot() DataFrame See Question&Answers more detail:os...

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

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288 views

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python - Do multiprocessing pools give every process the same number of tasks, or are they assigned as available?

When you map an iterable to a multiprocessing.Pool are the iterations divided into a queue for each process in the pool at ... 30, 26, 24, 20. 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 - PySpark and broadcast join example

I am using Spark 1.3 # Read from text file, parse it and then do some basic filtering to get data1 data1. ... can do the same using Python API. 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 create a link to another html page?

I have a form on one page that I want to submit to another page. I can't figure out how to create the link to ... }}"></a> What am I missing? 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 run my currently edited file in a PyCharm console in a way that I can type into the command line afterwards?

I want this so I can retain the command line history after repeated runs, and to paste lines from the console into ... since I just signed up.] See Question&Answers more detail:os...

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

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351 views

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python - Scrapy throws ImportError: cannot import name xmlrpc_client

After install Scrapy via pip, and having Python 2.7.10: scrapy Traceback (most recent call last): File "/usr/local/ ... >>> What's going 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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268 views

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python - pandas Series to Dataframe using Series indexes as columns

I have a Series, like this: series = pd.Series({'a': 1, 'b': 2, 'c': 3}) I want to convert it ... from Series, with index of Series as columns? See Question&Answers more detail:os...

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

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539 views

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python - import matplotlib.pyplot gives ImportError: dlopen(…) Library not loaded libpng15.15.dylib

I am aware that this exact same question has been asked before. I did follow the instructions given in the answer ... vexed me. Bless you all. See Question&Answers more detail:os...

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

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