Recent questions tagged Python

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python - How to get the original value of changed fields?

I'm using sqlalchemy as my orm, and use declarative as Base. Base = declarative_base() class User(Base): ... is it the best 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 - sqlite3.OperationalError: no such column - but I'm not asking for a column?

So, I'm trying to use sqlite3 and there seems to be a problem when I run a SELECT query, I'm not too familiar ... it to look in column 'Cost'? 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 - What is a cell in the context of an interpreter or compiler?

Python code objects have an attribute co_cellvars. The documentation to PyPy's bytecode interpreter often uses the ... problem do cells solve? 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 list.count to sort a list in-place using .sort() does not work. Why?

I am trying to sort a list by frequency of its elements. >>> a = [5, 5, 4, 4, 4, 1, 2, 2] >>> a ... ] Why does this method not work for .sort()? See Question&Answers more detail:os...

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

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285 views

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python - Programmatically tell if a Unicode character takes up more than one character space in a terminal

I discovered that in the Mac OS X Terminal, some Unicode characters take up more than one character space. For ... , why does it happen?) 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 - TkInter, slider: how to trigger the event only when the iteraction is complete?

I'm using the slider to update my visualization, but the command updateValue is sent everytime I move the slider ... the interaction is ended ? 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 - Read time from excel sheet using xlrd, in time format and not in float

I am trying to read some data from a excel file. One of the columns has time values in the ... , 0.91666666666666696, 0.95833333333333304] 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 - Selenium headless browser webdriver [Errno 104] Connection reset by peer

I am trying to scrape data from the URLs below. But selenium fails when driver.get(url) Some times the error ... Any help would be 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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python - Download a full page with scrapy

I want to download the content a whole page using scrapy. With selenium this is quite easy: import os,sys reload ... for such a simple task. 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 choose a random line from a text file

I am trying to make a lottery program for my school (we have an economic system). My program generates numbers ... my output as that number? See Question&Answers more detail:os...

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

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213 views

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python - Minimize a function of one variable in Tensorflow

I am new to Tensorflow and was wondering whether it would be possible to minimize a function of one variable using ... am I doing wrong 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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167 views

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python - Import CSV to database using sqlalchemy

I am using this example to upload a csv file into a sqlite database: this is my code: from numpy ... cdb1.__tablename__, if_exists='replace') 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 - Google App Engine: task_retry_limit doesn't work?

I have a Python GAE app. I want my tasks to stop running or just retry once if they fail. Right ... is task_retry_limit not actually being used? 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

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python when to use copy.copy

I think I'm starting to understand python, but I still have trouble with a basic question. When to use copy ... equals sign just copy the 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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482 views

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python - How to read from a text file compressed with 7z?

I would like to read (in Python 2.7), line by line, from a csv (text) file, which is 7z ... tmp)) ValueError: data error during decompression See Question&Answers more detail:os...

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

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224 views

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python - Sum rows where value equal in column

How can I sum across rows that have equal values in the first column of a numpy array? For example: In ... help would be greatly 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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268 views

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python - Connecting to IBM AS400 server for database operations hangs

I'm trying to talk to an AS400 in Python. The goal is to use SQLAlchemy, but when I couldn't get ... d greatly appreciate hearing them. 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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482 views

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python - mypy: Why is "int" a subtype of "float"?

Why does "mypy" consider "int" as a subtype of "float"? A subtype shall support all methods of its supertype, ... which "int" does not have. See Question&Answers more detail:os...

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

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146 views

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python - HTTP Error when trying to download MNIST data

I am using Google Colab for training a LeNet-300-100 fully-connected neural network on MNIST using Python3 and ... Unavailable What's wrong? See Question&Answers more detail:os...

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

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245 views

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python - How to store an array in hdf5 file which is too big to load in memory?

Is there any way to store an array in an hdf5 file, which is too big to load in memory? if I do something like ... 2**32) I get a memory 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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314 views

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python - django.core.exceptions.ImproperlyConfigured: The SECRET_KEY setting must not be empty

I created a new project in django and pasted some files from another project. Whenever I try to run the server, ... sys.argv) Any help? 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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646 views

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python - Save numpy array as image with high precision (16 bits) with scikit-image

I am working with 2D floating-point numpy arrays that I would like to save to greyscale .png files with high ... output a high bit-depth 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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292 views

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python - Pandas: How to fill null values with mean of a groupby?

I have a dataset will some missing data that looks like this: id category value 1 A NaN 2 B NaN 3 A 10.5 4 C NaN 5 A ... C 4.15 5 A 2.0 6 B 1.0 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 - What is the best way to obtain the optimal number of topics for a LDA-Model using Gensim?

I am trying to obtain the optimal number of topics for an LDA-model within Gensim. One method I found is ... number of topics with Gensim? 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

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python - Why does setting a descriptor on a class overwrite the descriptor?

Simple repro: class VocalDescriptor(object): def __get__(self, obj, objtype): print('__get__, obj={}, objtype= ... the methods are being called. See Question&Answers more detail:os...

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

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143 views

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python 3.x - How to use pip with Visual Studio Code

I have python 3.6 installed, I have a python extension installed on Visual Studio code but I still can't use ... installed. I'm on windows 10 See Question&Answers more detail:os...

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

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149 views

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python - Pausing a process?

Is there a way to pause a process (running from an executable) so that it stops the cpu load while it's ... in some way accessible by 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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724 views

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python - Pandas dropna() function not working

I am trying to drop NA values from a pandas dataframe. I have used dropna() (which should drop all NA rows from the ... '][4]) Out[3]: 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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