Recent questions tagged Python

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python - SQLAlchemy Many-to-Many Relationship on a Single Table

I have a SQLAlchemy model set up in my application that should mimic the functionality of "followers" on Twitter ... relationship to the ORM? 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 - Changing console_script entry point interpreter for packaging

I'm packaging some python packages using a well known third party packaging system, and I'm encountering an ... setuptools flags or configs? 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 - opencv - cropping handwritten lines (line segmentation)

I'm trying to build a handwriting recognition system using python and opencv. The recognition of the characters is ... words using above code? 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 - Write dictionary values in an excel file

I have a dictionary with multiple values for each key. I add the values using the following code: d. ... finish all the corresponding values. 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 - Sharing object (class instance) using multiprocessing Managers

I need to share an object and its methods between several processes in python. I am trying to use managers ... share objects and their methods? 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: how to find rows in one dataframe but not in another?

Let's say that I have two tables: people_all and people_usa, both with the same structure and therefore the same ... a bit convoluted. 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 - Killing the children with the parent

I have a program spawning and communicating with CPU heavy, unstable processes, not created by me. If my app ... manage to kill their children? See Question&Answers more detail:os...

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

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367 views

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python - numpy : calculate the derivative of the softmax function

I am trying to understand backpropagation in a simple 3 layered neural network with MNIST. There is the input ... better way to write 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 - Merge 2 sequential models in Keras

I a trying to merge 2 sequential models in keras. Here is the code: model1 = Sequential(layers=[ # input layers and ... max', 'sum' etc to them? 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 - Getting around tf.argmax which is not differentiable

I've written a custom loss function for my neural network but it can't compute any gradients. I thinks it is ... is possible. Can anyone 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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182 views

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python - wxPython WebView example

I am writing a small reporting app using wxPython (wxAUI). I want to render my data as HTML, to be displayed in a ... > </body> </html> """ See Question&Answers more detail:os...

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

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510 views

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python - Combining random forest models in scikit learn

I have two RandomForestClassifier models, and I would like to combine them into one meta model. They were both ... into one 500 tree model See Question&Answers more detail:os...

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

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804 views

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python - How to crop or remove white background from an image

I am trying to compare images using OpenCV and Python. Consider these images: Both feature an identical pair ... manually crop the backgrounds. See Question&Answers more detail:os...

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

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243 views

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python - Installing Pillow/PIL on Mavericks

I'm getting a strange error when trying to install Pillow using pip/easy_install: cc -fno-strict-aliasing -fno- ... I always get that error. See Question&Answers more detail:os...

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

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322 views

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python - Convert an excel or spreadsheet column letter to its number in Pythonic fashion

Is there a more pythonic way of converting excel-style columns to numbers (starting with 1)? Working code ... : question answered in C# See Question&Answers more detail:os...

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

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489 views

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python - What to do if I want 3D spline/smooth interpolation of random unstructured data?

I was inspired by this answer by @James to see how griddata and map_coordinates might be used. In the examples ... error griddata") 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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148 views

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python - Why don't scripting languages output Unicode to the Windows console?

The Windows console has been Unicode aware for at least a decade and perhaps as far back as Windows NT. However ... fully fix the bug in 2016. See Question&Answers more detail:os...

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

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241 views

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python - Sorting in pandas for large datasets

I would like to sort my data by a given column, specifically p-values. However, the issue is that I ... loading entire datasets in memory? See Question&Answers more detail:os...

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

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105 views

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python - Django + Postgres + Large Time Series

I am scoping out a project with large, mostly-uncompressible time series data, and wondering if Django + Postgres ... Is there a better 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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288 views

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python - Why NUMPY correlate and corrcoef return different values and how to "normalize" a correlate in "full" mode?

I'm trying to use some Time Series Analysis in Python, using Numpy. I have two somewhat medium-sized series ... very large, strange values? See Question&Answers more detail:os...

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

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188 views

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python - Images from ImageField in Django don't load in template

I'm building a gallery using Django(1.5.1) on my local machine. In my Album model I have a ImageField. There ... do now? Where is 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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364 views

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python - Using the Image.point() method in PIL to manipulate pixel data

I am using the Python Imaging Library to colorize a black and white image with a lookup table that defines the ... with a straight black image. See Question&Answers more detail:os...

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

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741 views

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python - Flask-Admin default filters

I would like to display only paid orders in my Flask-Admin model list view. Here is models.py: class Order( ... possible to do with Flask-Admin? 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 - Save session in IPython like in MATLAB?

It would be useful to save the session variables which could be loaded easily into memory at a later stage. See Question&Answers more detail:os...

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

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260 views

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python - How to add folder to search path for a given Anaconda environment?

I am developing a project in Python and I want to include some own modules which are not on the regular Python ... to have that folder). 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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744 views

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python - AttributeError: 'str' object has no attribute 'append'

>>> myList[1] 'from form' >>> myList[1].append(s) Traceback (most recent call last): File "<pyshell#144>", line 1, in < ... '], [1, 2, 't']] >>> See Question&Answers more detail:os...

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

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136 views

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python - In Pandas, how to filter a Series based on the type of the values?

Given a Series like import pandas as pd s = pd.Series(['foo', 'bar', 42]) I would like to obtain a 'sub ... type of) the values 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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298 views

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python - Plotting multiple lines with Bokeh and pandas

I would like to give a pandas dataframe to Bokeh to plot a line chart with multiple lines. The x-axis ... different color? Thanks in advance. See Question&Answers more detail:os...

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

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