Recent questions tagged Python

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python - Should a return statement have parentheses?

Suppose we have in Python 3.x (and I guess in Python 2.6 and in Python 2.7 too) the following functions ... my questions still remain 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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635 views

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python - Django Rest Framework: turn on pagination on a ViewSet (like ModelViewSet pagination)

I have a ViewSet like this one to list users' data: class Foo(viewsets.ViewSet): def list(self, request): ... all. How can I paginate 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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144 views

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python - Matplotlib plot is a no-show

When I run this code import pandas as pd import numpy as np def add_prop(group): births = group.births.astype ... me in the right direction? See Question&Answers more detail:os...

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

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441 views

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python - Ignore divide by 0 warning in NumPy

I have a function for statistic issues: import numpy as np from scipy.special import gamma as Gamma def Foo( ... python warnings, just this one. 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 - Add an empty column to Spark DataFrame

As mentioned in many other locations on the web, adding a new column to an existing DataFrame is not ... to_none(df_old['any_col_from_old'])) 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 - How to simply add a column level to a pandas dataframe

let say I have a dataframe that looks like this: df = pd.DataFrame(index=list('abcde'), data={'A': ... to an already existing 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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510 views

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python - how to use initializer to set up my multiprocess pool?

I'm trying to use the multiprocess Pool object. I'd like each process to open a database connection when it ... () into the process_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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python - Why doesn't Pylint like built-in functions?

I have a line like this: filter(lambda x: x == 1, [1, 1, 2]) Pylint is showing a warning: W: 3: ... was wondering if there's a PEP for 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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290 views

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python - How can I programmatically obtain the max_length of a Django model field?

Say I have a Django class something like this: class Person(models.Model): name = models.CharField(max_length=50) ... value for the name field? 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 - How to pickle yourself?

I want my class to implement Save and Load functions which simply do a pickle of the class. But apparently you ... ) cPickle.dump(self,f,2) See Question&Answers more detail:os...

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

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111 views

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python - how to add value to a tuple?

I'm working on a script where I have a list of tuples like ('1','2','3','4'). e.g.: list = [('1','2 ... ,'7','4567')] Is it possible in 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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372 views

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python - Conda - Silently installing a package

I am trying to automate the process of setting up a development environment with pandas package using conda. I ... command. 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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268 views

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python - How to migrate back from initial migration in Django 1.7?

I created a new app with some models and now I noticed that some of the models are poorly thought out. As ... this with Django 1.7 migrations? See Question&Answers more detail:os...

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

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346 views

1 answer

python - Proportional venn diagram for more than 3 sets

I have a collection of documents in MongoDB where each has one or more categories in a list. Using map reduce ... (+Numpy/MatPlotLib) or MatLab. See Question&Answers more detail:os...

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

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379 views

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python - How to find the local minima of a smooth multidimensional array in NumPy efficiently?

Say I have an array in NumPy containing evaluations of a continuous differentiable function, and I want to find ... numpy.gradient() 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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120 views

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python - Fill and submit html form

I am trying / wanting to write a Python script (2.7) that goes to a form on a website (with the name "form1 ... or pointers on how 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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812 views

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python - Saving a Pandas DataFrame to a Django Model

I have stock price data that is stored in a pandas DataFrame as shown below (actually it was in a panel, but I ... it just reads from the DB. See Question&Answers more detail:os...

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

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436 views

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python - How can I implement a weighted cross entropy loss in tensorflow using sparse_softmax_cross_entropy_with_logits

I am starting to use tensorflow (coming from Caffe), and I am using the loss ... same with sparse_softmax_cross_entropy_with_logits? See Question&Answers more detail:os...

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

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200 views

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python - Submit data via web form and extract the results

My python level is Novice. I have never written a web scraper or crawler. I have written a python code to connect to an ... is:</b> male! </p> See Question&Answers more detail:os...

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

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154 views

1 answer

python - Dealing with the class imbalance in binary classification

Here's a brief description of my problem: I am working on a supervised learning task to train a binary ... with the scikit-learn 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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490 views

1 answer

python - How can I abort a task in a multiprocessing.Pool after a timeout?

I am trying to use the multiprocessing package of python in this way: featureClass = [[1000, k, 1] for k ... its result. Is that possible? See Question&Answers more detail:os...

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

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518 views

1 answer

python - Paramiko Fails to download large files >1GB

def download(): if os.path.exists( dst_dir_path ) == False: logger.error( "Cannot access destination folder %s. ... the behavior of sftp.get(). See Question&Answers more detail:os...

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

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137 views

1 answer

python - Using lookahead with generators

I have implemented a generator-based scanner in Python that tokenizes a string into tuples of the form (token ... generator in the first place? 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 - How can I simplify repetitive if-elif statements in my grading system function?

The goal is to build a program to convert scores from a '0 to 1' system to an 'F to A' system: If ... fewer arguments, it would be even better. 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

1 answer

python - How to load a pickle file from S3 to use in AWS Lambda?

I am currently trying to load a pickled file from S3 into AWS lambda and store it to a list (the pickle ... : 'oldscreenurls.pkl' Any ideas? See Question&Answers more detail:os...

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

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127 views

1 answer

python - Get only unique elements from two lists

If I have two lists (may be with different len): x = [1,2,3,4] f = [1,11,22,33,44,3,4] result = [11,22 ... I'm getting result = [11,22,33,44,4] See Question&Answers more detail:os...

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

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431 views

1 answer

python - numpy vs. multiprocessing and mmap

I am using Python's multiprocessing module to process large numpy arrays in parallel. The arrays are memory- ... on modifying existing 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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134 views

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python - GAE SDK 1.7.4 and InvalidCertificateException

Recently, I upgraded my GAE SDK to ver. 1.7.4 and it started to throw 'InvalidCertificateException' ... com/appengine/kb/general.html#rpcssl See Question&Answers more detail:os...

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

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