Recent questions tagged Python

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python sqlalchemy get column names dynamically?

#!/usr/bin/env python # -*- coding: utf-8 -*- from sqlalchemy import create_engine connection = create_engine(' ... in this case id and 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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python - Read ZIP files from S3 without downloading the entire file

We have ZIP files that are 5-10GB in size. The typical ZIP file has 5-10 internal files, each 1- ... this possible without rewriting the module? 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 convert numpy array to keras tensor

When using the keras model to do predict, I got the error below AttributeError: 'Tensor' object has no ... numpy array to keras tensor? 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 get class variables and type hints?

Assume I define a class with class level variables with type hints (e.g. something like the new python 3.7 ... (variable name, variable type)? 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 - Pip Install hangs

I currently have Python 3.5 on my Windows machine. I'm trying to install a Python package using the command "pip ... I get pip install to work? See Question&Answers more detail:os...

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

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250 views

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python - Pandas replace values

I have the following dataframe: col 0 pre 1 post 2 a 3 b 4 post 5 pre 6 pre I want to replace all ... all possible col values in a dictionary? 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 - Parse XML with (X)HTML entities

Trying to parse XML, with ElementTree, that contains undefined entity (i.e.  ) raises: ParseError: undefined entity ... as in Python 2.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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python - 405 "Method POST is not allowed" in Django REST framework

I am new in Django REST framework. Can someone explain why I get such error, if I make a POST request to ... this parameter in the URL pattern? See Question&Answers more detail:os...

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

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506 views

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python - How to run two functions simultaneously

I am running test but I want to run 2 functions at the same time. I have a camera and I am telling it ... speed while it is still moving. 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 - Auto activate virtual environment in Visual Studio Code

I want VS Code to turn venv on run, but I can't find how to do that. I already tried to add to ... when you install Git to your machine. See Question&Answers more detail:os...

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

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499 views

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python - How to calculate percentage with Pandas' DataFrame

How to add another column to Pandas' DataFrame with percentage? The dict can change on size. >>> import pandas as pd ... 9 [4 rows x 2 columns] See Question&Answers more detail:os...

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

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252 views

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python - Function closure vs. callable class

In many cases, there are two implementation choices: a closure and a callable class. For example, class F: def ... ? What else could be added? See Question&Answers more detail:os...

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

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315 views

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python - PyMySQL returning old/snapshot values/not rerunning query?

I'm using pymysql.cursors and a simplified code example that loads a row from a table and prints it every second ... bit and it just looks odd. See Question&Answers more detail:os...

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

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432 views

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python - unable to install pyspark

I am trying to install pyspark as this: python setup.py install I get this error: Could not import pypandoc - ... how can I install pyspark? See Question&Answers more detail:os...

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

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712 views

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python 3.x - Eclipse pydev warning - "Debugger speedups using cython not found."

I get this warning while running a python program (some basic web automation using selenium): warning: Debugger ... I address this issue? See Question&Answers more detail:os...

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

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249 views

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python - Django custom for complex Func (sql function)

In the process of finding a solution for Django ORM order by exact, I created a custom django Func: from django ... you can test any solution. See Question&Answers more detail:os...

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

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351 views

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python - No module named backends.default.urls

So I've installed django-registration through easy_install. I'm following a quick start guide and I'm trying to ... .backends.default.urls')), See Question&Answers more detail:os...

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

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422 views

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python - Poetry and PyTorch

I've recently found poetry to help out with all of the different dependencies for our group. In one project we ... would appreciate any 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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426 views

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python - Pandas: plot multiple time series DataFrame into a single plot

I have the following pandas DataFrame: time Group blocks 0 1 A 4 1 2 A 7 2 3 A 12 3 4 A 17 4 5 A 21 ... all in one series. How do I solve 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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274 views

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python - Installing guppy with pip3 issues

I am trying to install guppy. My program uses python3 so I must use pip3 exclusively. When I run: pip3 install ... a way to resolve this issue? See Question&Answers more detail:os...

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

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299 views

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python imaging library - Error in images2gif.py with GlobalPalette

Getting an error when trying to convert sequence of jpgs to gifs. Can't seem to figure out how to add a palette, ... if that's the issue. 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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318 views

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python - Best way to install pygame on OS X Lion?

I tried to install pygame via pip but this fails. Based on my google searches, it sounds like easy_install ... Suggestions? Appreciate the 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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320 views

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python - Django ListView customising queryset

Hopefully this should be a simple one to help me with. I have a page with a dropdown menu containing three ... displayed on the other two sets. See Question&Answers more detail:os...

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

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289 views

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python - Length of each string in a NumPy array

Is there any builtin operation in NumPy that returns the length of each string in an array? I don't think any of the ... sizes) [5, 3, 3, 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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373 views

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python - What is the correct ways to write Boto3 filters to use customise tag name?

I am trying to list the instances on tag values of different tag keys For eg> one tag key - Environment, other tag ... 'list'>, <type 'tuple'> 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

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python - Why is the 'running' of .pyc files not faster compared to .py files?

I know the difference between a .py and a .pyc file. My question is not about how, but about why According ... execution compared to .py files? 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 - What is the difference between <class 'str'> and <type 'str'>

I am new to python. I'm confused by the <class 'str'>. I got a str by using: response = urllib.request.urlopen ... that I can use in 'for 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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514 views

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python - Cartesian product of large iterators (itertools)

From a previous question I learned something interesting. If Python's itertools.product is fed a series of ... backend of itertools!). See Question&Answers more detail:os...

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

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