Recent questions tagged PYTHON

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python - How to read a CSV file from a stream and process each line as it is written?

I would like to read a CSV file from the standard input and process each row as it comes. My CSV outputting code ... there to be a 500ms gap. See Question&Answers more detail:os...

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

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238 views

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python - How to build a sparkSession in Spark 2.0 using pyspark?

I just got access to spark 2.0; I have been using spark 1.6.1 up until this point. Can someone please ... . I apologize if it is convoluted. See Question&Answers more detail:os...

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

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410 views

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python - Get the same hash value for a Pandas DataFrame each time

My goal is to get unique hash value for a DataFrame. I obtain it out of .csv file. Whole point is to ... to retrieve some value from cache. See Question&Answers more detail:os...

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

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287 views

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python - how to subquery in queryset in django?

how can i have a subquery in django's queryset? for example if i have: select name, age from person, ... because it returns two output... See Question&Answers more detail:os...

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

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890 views

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python - Clipping input data to the valid range for imshow with RGB data ([0..1] for floats or [0..255] for integers)

I tried to run the graph cut algorithm for a slice of an MRI after converting it into PNG format. I keep ... (out, vmin=0, vmax=255) 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 - Data-frame Object has no Attribute

I know that this kind of question was asked before and I've checked all the answers and I have tried several ... has no attribute '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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1.2k views

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python - Sql Alchemy QueuePool limit overflow

I have a Sql Alchemy application that is returning TimeOut: TimeoutError: QueuePool limit of size 5 overflow 10 ... manage the pool size? See Question&Answers more detail:os...

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

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405 views

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python - SQLAlchemy query where a column contains a substring

I'm constructing a query using SQLAlchemy and SQLite3 in which I'd like to select rows in which a String ... best way to accomplish 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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507 views

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python - Optional dependencies in a pip requirements file

How can I specify optional dependencies in a pip requirements file? According to the pip documentation this is ... examples on the web. See Question&Answers more detail:os...

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

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419 views

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python - ImportError: No module named enum

I changed from Win XP 32bit to Win7 64bit and reinstalled Python 2.7 and the Anaconda package. However, it seems ... idea how to go from 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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298 views

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python - Using Merge on a column and Index in Pandas

I have two separate dataframes that share a project number. In type_df, the project number is the index. In ... not defined. Desired Output: 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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444 views

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python - Second y-axis time series seaborn

Using the data frame df = pd.DataFrame({ "date" : ["2018-01-01", "2018-01-02", "2018-01-03", "2018- ... time series with two y-axis in seaborn ? See Question&Answers more detail:os...

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

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333 views

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python - How to clear Tkinter Canvas?

When I draw a shape using: canvas.create_rectangle(10, 10, 50, 50, color="green") Does Tkinter keep track of ... , like in the HTML5 canvas? 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

1 answer

python - df.drop if it exists

Below is a function that takes a file and drops column names 'row_num", 'start_date', 'end_date.' The problem is not ... (df.iloc[-1]) return df See Question&Answers more detail:os...

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

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530 views

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python - How to set default text for a Tkinter Entry widget

How do I set the default text for a Tkinter Entry widget in the constructor? I checked the documentation, but I ... for a simple Entry widget. See Question&Answers more detail:os...

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

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254 views

1 answer

python - How can I run the current file in PyCharm

How can I run the current file in PyCharm? I would like a single hotkey that will execute the current file ( ... . Is such a thing 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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350 views

1 answer

python - Django DetailView - how to use 'request' in get_context_data

I am trying to modify context data, so I overrided get_context_data. I need the request variable to modify ... variable in get_context-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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423 views

1 answer

python - In pandas, how can I reset index without adding a new column?

In [37]: df = pd.DataFrame([[1, 2, 3, 4], [2, 3, 4, 5], [3, 4, 5, 6]]) In [38] ... that how can I reset_index without adding a new column index? See Question&Answers more detail:os...

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

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408 views

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python - From stat().st_mtime to datetime?

What is the most idiomatic/efficient way to convert from a modification time retrieved from stat() call to a ... there a more direct 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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484 views

1 answer

python - ImportError: No module named Cython.Distutils

I'm having a strange problem while trying to install the Python library zenlib, using its setup.py file. When I run ... to try next!? 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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415 views

1 answer

python - Passing file as argument to Docker container

A very simple python program, suppose current directory is /PYTHON, I want to pass file.txt as argument to python ... (I am new to Docker) See Question&Answers more detail:os...

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

0 votes

335 views

1 answer

python - Py.test No module named *

I have a folder structure like this App --App --app.py --Docs --Tests --test_app.py In my test_app.py ... app. How should I configure 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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230 views

1 answer

python - How to use Django to get the name for the host server?

How to use Django to get the name for the host server? I need the name of the hosting server instead of the client name? See Question&Answers more detail:os...

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

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485 views

1 answer

python - mypy, type hint: Union[float, int] -> is there a Number type?

mypy is really handy and catches a lot of bugs, but when I write "scientific" applications, I often end up doing ... an official way to do 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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207 views

1 answer

python - how to run this code in django template

this is my code : {% for i,j in enumerate(a) %} {{i}} ,{{j}} {% endfor%} but , it show a ... to run the enumerate in django template , thanks See Question&Answers more detail:os...

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

0 votes

499 views

1 answer

python - mean, nanmean and warning: Mean of empty slice

Say I construct two numpy arrays: a = np.array([np.NaN, np.NaN]) b = np.array([np.NaN, np. ... the behaviour of nanmean without that warning? See Question&Answers more detail:os...

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

0 votes

205 views

1 answer

python - Writing to a new file if it doesn't exist, and appending to a file if it does

I have a program which writes a user's highscore to a text file. The file is named by the user when they choose ... file, and I get no errors. See Question&Answers more detail:os...

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

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726 views

1 answer

python - Writing then reading in-memory bytes (BytesIO) gives a blank result

I wanted to try out the python BytesIO class. As an experiment I tried writing to a zip file in memory, and then ... 3.4. What am I missing? See Question&Answers more detail:os...

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

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