Recent questions tagged Python

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python - The Assignment Problem, a NumPy function?

Since an assignment problem can be posed in the form of a single matrix, I am wondering if NumPy has a ... could be much faster, right? See Question&Answers more detail:os...

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

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309 views

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python - Reading data from text file with missing values

I want to read data from a file that has many missing values, as in this example: 1,2,3,4,5 6,,,7 ... the bullet and parse each line manually? 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 Comparison and Floating Point Precision

I'm looking to compare two dataframes which should be identical. However due to floating point precision I am being told ... ) A 0 True 1 False 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 - web.py - specify address and port

How to specify listening address and port in web.py? Something like: web.application( urls, host="33.44. ... default web.py command line parsing See Question&Answers more detail:os...

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

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466 views

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python - DLL load failed: The specified module could not be found when doing "from mpi4py import MPI"

I am trying to use Mpi4py 1.3 with python 2.7 on Windows 7 64bits. I downloaded the installable version from here ... and how to fix the 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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python - Using super() in a property's setter method when using the @property decorator raises an AttributeError

I am a little confused by the behavior when attempting to overwrite a property in a subclass. The first example ... correctly a a b bChild See Question&Answers more detail:os...

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

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361 views

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python - Jinja2 Exception Handling

Is there a way to handle exceptions within a template in jinja2? {% for item in items %} {{ item| ... template rendering to fail? 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 save dictionaries and arrays in the same archive (with numpy.savez)

first question here. I'll try to be concise. I am generating multiple arrays containing feature information ... are greatly appreciated. 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 - Add new rows to pyspark Dataframe

Am very new pyspark but familiar with pandas. I have a pyspark Dataframe # instantiate Spark spark = SparkSession.builder. ... +----+----+ See Question&Answers more detail:os...

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

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488 views

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python - How to route a chain of tasks to a specific queue in celery?

When I route a task to a particular queue it works: task.apply_async(queue='beetroot') But if I create a ... sequentially in the same queue. See Question&Answers more detail:os...

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

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403 views

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python - Hide stderr output in unit tests

I'm writing a few unit tests of some code which uses sys.stderr.write to report errors in input. This is as it ... commands, à la 2> /dev/null? See Question&Answers more detail:os...

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

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664 views

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python - Pandas: remove group from the data when a value in the group meets a required condition

I have groupings of values in the data and within each group, I would like to check if a value within the group is ... Count 2 12 2 15 2 21 See Question&Answers more detail:os...

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

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656 views

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python - Paramiko: "not a valid RSA private key file"

I am trying connect to server using following spinet ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko ... private key 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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331 views

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python - How to apply data augmentation in TensorFlow 2.0 after tfds.load()

I'm following this guide. It shows how to download datasets from the new TensorFlow Datasets using tfds.load() ... data for next training 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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383 views

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python - Document topical distribution in Gensim LDA

I've derived a LDA topic model using a toy corpus as follows: documents = ['Human machine interface for lab ... Thank you for your kind answer! See Question&Answers more detail:os...

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

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303 views

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python - Inputs to eager execution function cannot be Keras symbolic tensors

I am trying to implement sample- and pixel-dependent dependent loss weighting in tf.Keras (TensorFlow 2.0.0rc0) for ... Done.') Any other 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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python - Iterate over subclasses of a given class in a given module

In Python, given a module X and a class Y, how can I iterate or generate a list of all subclasses of Y that exist in module X? See Question&Answers more detail:os...

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

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227 views

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python - Most efficient way to search in list of dicts

I have the following list of dicts. people = [ {'name': "Tom", 'age': 10}, {'name': "Mark", 'age ... ] Any other method is also welcome. 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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835 views

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python - ImportError: No module named 'cv2' Python3

I have such a problem (face_det) user@pc:~$ python3 Python 3.5.3 (default, Apr 22 2017, 00:00:00) [GCC ... opencv 3.2.0 np112py27_0 conda-forge See Question&Answers more detail:os...

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

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336 views

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python - Filtering Django Admin by Null/Is Not Null

I have a simple Django model like: class Person(models.Model): referrer = models.ForeignKey('self', null=True ... disappear by the next release. See Question&Answers more detail:os...

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

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968 views

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python - "Divide by zero encountered in log" when not dividing by zero

When I do: summing += yval * np.log(sigmoid(np.dot(w.transpose(), xi.transpose()))) + (1-yval)* np.log ... ? As a result, summing becomes [nan]. See Question&Answers more detail:os...

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

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626 views

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python - How to align the bar and line in matplotlib two y-axes chart?

I have a pandas df as below: >>> df sales net_pft sales_gr net_pft_gr STK_ID RPT_Date 600809 20120331 22.1401 4. ... aligned at the same line? See Question&Answers more detail:os...

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

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267 views

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python - How should I name my classes and function and even strings?

I am new to Python as you might tell. I have read various documents but I still can not figure out if ... (learning, better to say!) See Question&Answers more detail:os...

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

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344 views

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python - numpy on multicore hardware

What's the state of the art with regards to getting numpy to use mutliple cores (on Intel hardware) ... NOT AVAILABLE mkl_info: NOT AVAILABLE See Question&Answers more detail:os...

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

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974 views

1 answer

python - How to detect merged cells in an Excel sheet?

I'm trying to read data from an Excel sheet that contains merged cells. When reading merged cells with openpyxl the ... so I can't use that. See Question&Answers more detail:os...

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

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404 views

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python - Python3 rounding to nearest even

Python3.4 rounds to the nearest even (in the tie-breaker case). >>> round(1.5) 2 >>> round(2. ... there a discrepancy between the two behaviors? See Question&Answers more detail:os...

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

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505 views

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python - Overriding dict.update() method in subclass to prevent overwriting dict keys

Earlier today, I read the question "Raise error if python dict comprehension overwrites a key" and decided to try ... : self.__setitem__(k, v) See Question&Answers more detail:os...

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

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558 views

1 answer

python - TensorFlow: cast a float64 tensor to float32

I am trying to use: train = optimizer.minimize(loss) but the standard optimizers do not work with tf.float64. ... 0, expected: [tf.float32]. See Question&Answers more detail:os...

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

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