Recent questions tagged Python

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python - Get current number of partitions of a DataFrame

Is there any way to get the current number of partitions of a DataFrame? I checked the DataFrame javadoc ( ... a getNumPartitions() method.) 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 select columns from dataframe by regex

I have a dataframe in python pandas. The structure of the dataframe is as the following: a b c d1 d2 d3 10 ... way to achieve this 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 - How to show the error messages caught by assertRaises() in unittest in Python2.7?

In order to make sure that the error messages from my module are informative, I would like to see all the error ... integer. Given: None',) ok 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 write a function that returns another function?

In Python, I'd like to write a function make_cylinder_volume(r) which returns another function. That returned ... I return another 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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python - tensorflow.train.import_meta_graph does not work?

I try to simply save and restore a graph, but the simplest example does not work as expected (this is done ... will produce the same result? 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 - Scatterplot Contours In Matplotlib

I have a massive scatterplot (~100,000 points) that I'm generating in matplotlib. Each point has a location in ... work in this way. 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 - Deprecated rolling window option in OLS from Pandas to Statsmodels

as the title suggests, where has the rolling function option in the ols command in Pandas migrated to in statsmodels ... be supposed to work 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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python - How to write a Pandas Dataframe to Django model

I have been using pandas in python and I usually write a dataframe to my db table as below. I am now ... engine,if_exists='append',index=True) 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 - Curve curvature in numpy

I am measuring x,y coordinates (in cm) of an object with a special camera in fixed time intervals of 1s. ... be solved. Can somebody 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 - How to recreate a deleted table with Django Migrations?

There are two models Groups and Students and only one table for Groups of them, the Students table was ... "students_students" does not exist See Question&Answers more detail:os...

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

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455 views

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python - tf-idf feature weights using sklearn.feature_extraction.text.TfidfVectorizer

this page: http://scikit-learn.org/stable/modules/feature_extraction.html mentions: As tf-idf is a very often ... attribute is missing. 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 - Suds over https with cert

I have soap service under Apache with ssl, suds works greate without ssl. I have client certificate (my. ... :sslv3 alert handshake failure> 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 - Easiest way to serialize a simple class object with simplejson?

I'm trying to serialize a list of python objects with JSON (using simplejson) and am getting the error that the ... /floats etc.) thank you. See Question&Answers more detail:os...

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

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183 views

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python - Unbalanced classification using RandomForestClassifier in sklearn

I have a dataset where the classes are unbalanced. The classes are either '1' or '0' where ... edu/~breiman/RandomForests/cc_home.htm#balance 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 cache Django Rest Framework API calls?

I'm using Memcached as backend to my django app. This code works fine in normal django query: def get_myobj() ... cache these calls? Thank you. See Question&Answers more detail:os...

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

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118 views

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python - Use of PunktSentenceTokenizer in NLTK

I am learning Natural Language Processing using NLTK. I came across the code using PunktSentenceTokenizer ... use of PunktSentenceTokenizer 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 - save numpy array in append mode

Is it possible to save a numpy array appending it to an already existing npy-file --- something like np. ... accessing the slices when needed. See Question&Answers more detail:os...

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

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419 views

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python - What is the difference between random.randint and randrange?

The only differences between randrange and randint that I know of are that with randrange([start], stop[, step]) ... (0, 1) which does? See Question&Answers more detail:os...

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

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516 views

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python - Django testing model with ImageField

I need to test the Photo model of my Django application. How can I mock the ImageField with a test image file? ... (Photo.objects.count(), 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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310 views

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python - tell pip to install the dependencies of packages listed in a requirement file

Developing a Django web app, I have a list of packages I need to install in a virtualenv. Say: Django= ... pip not installing all dependencies. See Question&Answers more detail:os...

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

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737 views

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python - How to make pylab.savefig() save image for 'maximized' window instead of default size

I am using pylab in matplotlib to create a plot and save the plot to an image file. However, when I ... being superimposed on one another. 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 - Convert Select Columns in Pandas Dataframe to Numpy Array

I would like to convert everything but the first column of a pandas dataframe into a numpy array. For some ... yields an array of all NaNs See Question&Answers more detail:os...

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

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120 views

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python - Indexing Pandas data frames: integer rows, named columns

Say df is a pandas dataframe. df.loc[] only accepts names df.iloc[] only accepts integers (actual placements) df. ... df.iloc[rows].loc[cols]? 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 - False or None vs. None or False

In [20]: print None or False -------> print(None or False) False In [21]: print False or None ---- ... I expected them to both behave 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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472 views

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python - fit_transform() takes 2 positional arguments but 3 were given with LabelBinarizer

I am totally new to Machine Learning and I have been working with unsupervised learning technique. Image shows my ... arguments but 3 were given See Question&Answers more detail:os...

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

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110 views

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python - How can I get the output of a matplotlib plot as an SVG?

I need to take the output of a matplotlib plot and turn it into an SVG path that I can use on a laser ... 't accept svg graphics for display) See Question&Answers more detail:os...

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

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124 views

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python - How to read pickle file?

I created some data and stored it several times like this: with open('filename', 'a') as f: pickle.dump(data ... How can I correctly read file? See Question&Answers more detail:os...

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

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132 views

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python - Matplotlib: "Unknown projection '3d'" error

I just installed matplotlib and am trying to run one of there example scripts. However I run into the ... ValueError: Unknown projection '3d' See Question&Answers more detail:os...

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

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