Recent questions tagged PYTHON

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python - Is it possible to implement a "change password at next logon" type feature in the django admin?

I want to be able to set an option in the user's settings that forces them to change their password upon the ... it. Thanks for 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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983 views

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python - How to set/get Pandas dataframes into Redis using pyarrow

Using dd = {'ID': ['H576','H577','H578','H600', 'H700'], 'CD': ['AAAAAAA', 'BBBBB', 'CCCCCC', ... How to set/get pandas.DataFrame to/from Redis? See Question&Answers more detail:os...

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

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440 views

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python - Subclassing collections namedtuple

Python's namedtuple can be really useful as a lightweight, immutable data class. I like using them for bookkeeping ... m using Python 2.7. See Question&Answers more detail:os...

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

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204 views

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python - Running matplotlib in tkinter

I have this beautiful sphere I made in matplotlib. How would I go about putting it in a tkinter frame widget? It ... #cmap=cm.jet plt.show() 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 - How to get an average picture from 100 pictures using PIL?

For example, I have 100 pictures whose resolution is the same, and I want to merge them into one picture. For ... in PIL(Python Image 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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268 views

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python - Installing SciPy on Ubuntu

I have Python 2.7 running and trying to install scipy by using easy_install which returns following errors: ... don't disappear. 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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300 views

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python - ipython complaining about readline

When I install ipython on my osx and run it, I get the following warning: /Library/Frameworks/Python. ... is installed and imports correctly. See Question&Answers more detail:os...

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

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191 views

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python - Replacing a Django image doesn't delete original

In Django, if you have a ImageFile in a model, deleting will remove the associated file from disk as ... users replace their images frequently. See Question&Answers more detail:os...

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

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229 views

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python - Ubuntu, how to install OpenCV for python3?

I want to install OpenCV for python3 in ubuntu 16.04. Fist I tried running sudo apt-get install python3-opencv ... it could not find it either. See Question&Answers more detail:os...

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

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537 views

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python - How to save Scikit-Learn-Keras Model into a Persistence File (pickle/hd5/json/yaml)

I have the following code, using Keras Scikit-Learn Wrapper: from keras.models import Sequential from sklearn import ... I get around 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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575 views

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python - How can I normalize the data in a range of columns in my pandas dataframe

Suppose I have a pandas data frame surveyData: I want to normalize the data in each column by performing: ... name state and gender 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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217 views

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python - How can I get a specific field of a csv file?

I need a way to get a specific item(field) of a CSV. Say I have a CSV with 100 rows and 2 columns (comma ... module, but I don't get 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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417 views

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python - How do I override delete() on a model and have it still work with related deletes

I'm having a problem because I'm deleting a Widget by using some_widget_instance.delete(). I also have a ... Any help is much appreciated. See Question&Answers more detail:os...

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

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536 views

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python - flask-cache memoize URL query string parameters as well

The flask-cache extension has a @cache.memoize decorator to cache a view including the view's *args and **kwargs ... URL query strings as well? See Question&Answers more detail:os...

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

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362 views

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python - expanding (adding a row or column) a scipy.sparse matrix

Suppose I have a NxN matrix M (lil_matrix or csr_matrix) from scipy.sparse, and I want to make it (N+1)xN ... do this without copying the data? See Question&Answers more detail:os...

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

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532 views

1 answer

python - when to use pre_save, save, post_save in django?

I see I can override or define pre_save, save, post_save to do what I want when a model instance gets saved ... in which situation and why? See Question&Answers more detail:os...

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

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691 views

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python - Setting a relative frequency in a matplotlib histogram

I have data as a list of floats and I want to plot it as a histogram. Hist() function does the ... me perfectly correct fractions. 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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531 views

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python - Sort list of strings ignoring upper/lower case

I have a list which contains strings representing animal names. I need to sort the list. If I use sorted(list), it ... 'Cat', 'Goat', 'Lion'] See Question&Answers more detail:os...

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

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194 views

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python - How do I see the Django debug toolbar?

I have a Django webapp. I have installed the debug_toolbar middleware and module. However, my webapps don't ... Fixing that fixed the problem! See Question&Answers more detail:os...

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

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458 views

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python - Pandas KeyError: value not in index

I have the following code, df = pd.read_csv(CsvFileName) p = df.pivot_table(index=['Hour'], columns='DOW', values ... to know how to fix 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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953 views

1 answer

python - Feature selection using scikit-learn

I'm new in machine learning. I'm preparing my data for classification using Scikit Learn SVM. In order to select ... can I transform my data ? See Question&Answers more detail:os...

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

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457 views

1 answer

python - Django Delete all but last five of queryset

I have a super simple django model here: class Notification(models.Model): message = models.TextField() user ... one that works consistently. See Question&Answers more detail:os...

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

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461 views

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python - Pandas - how to convert r dataframe back to pandas?

I converted a pandas df to r using the the below: import pandas as pd import pandas.rpy.common as com import rpy2. ... df? df = f(rdf) ? See Question&Answers more detail:os...

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

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409 views

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python - Pandas - GroupBy and then Merge on original table

I'm trying to write a function to aggregate and perform various stats calcuations on a dataframe in Pandas ... pol_acc_df.PVALUE_Acc,4) 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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291 views

1 answer

python - Jupyter notebook command does not work on Mac

I installed jupyter using pip on my macbook air. Upon trying to execute the command jupyter notebook, I get an ... : /usr/local/bin/jupyter See Question&Answers more detail:os...

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

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471 views

1 answer

python - Equation numbering in Jupyter notebooks

The fact is, that in official documentation Jupyter - motivating examples stands Equation numbering and referencing will ... good/bad decision. See Question&Answers more detail:os...

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

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256 views

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python - How to access pandas DataFrame datetime index using strings

This is a very simple and practical question. I have the feeling that it must be a silly detail and that ... maybe I'm missing something 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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339 views

1 answer

python - Setting initial Django form field value in the __init__ method

Django 1.6 I have a working block of code in a Django form class as shown below. The data set from ... : self.initial[field_name] = field_value See Question&Answers more detail:os...

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

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