Recent questions tagged Python

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python - Devanagari text rendering improperly in PyGame

We have a small web app that we want to convert into something native. Right now, it's got a lot of moving ... batch mode to get my work done. 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 - Retrieve distinct values from the hash key - DynamoDB

I have a dynamodb table to store email attribute information. I have a hash key on the email, range key on ... to calculate the cost per query? 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 - Can Pickle handle multiple object references

If I have objects a and b and both reference object obj, what happens when I Pickle and then restore ... and initially equal — objects? 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 freeze does not show all installed packages

I am using a virtualenv. I have fabric installed, with pip. But a pip freeze does not give any hint about that. ... be? Any way to debug 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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python - Sphinx generates empty documentation

I'm trying to generate documentation for my project with Sphinx, but the output documentation doesn't contain ... _build/html/searchindex.js 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 does cls.__name__ not appear in dir()?

Let's say I have a simple class: class Foobar(object): pass If I use dir(Foobar), I'll get the following ... . Why does Python behave that 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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python - How to convert an integer to a list of bits?

I'm trying to represent an integer as a list of bits and left pad it to 8 bits only if the integer is < ... 8 bits and also for larger ones? 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 do I set attribute default values in sqlalchemy declarative?

In SQLAlchemy Declarative, how do I set up default values for columns, such that transient or pending object ... a custom declarative baseclass. 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 give Tkinter file dialog focus

I'm using OS X. I'm double clicking my script to run it from Finder. This script imports and runs the function ... ends up on top? Thanks, Wes 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 a custom JSON encoder for SQLAlchemy's PostgreSQL JSONB implementation

I am using SQLAlchemy's core library to access some PostgreSQL database. Consider I have the following table: ... data into PostgreSQL dialect? 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 - Get files from Directory Argument, Sorting by Size

I'm trying to write a program that takes a command line argument, scans through the directory tree provided by ... 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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python - Can I use rpy2 to save a pandas dataframe to an .Rdata file?

I never used rpy2 before, but I am just wondering if I could use it to save a python object (a pandas ... to use the information in R. 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 solve AttributeError when importing igraph?

When I import the igraph package in my project, I get an AttributeError. This only happens in the project directory ... can I solve this 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 - How to handle proxies in urllib3

I am having trouble finding solid examples of how to build a simple script in urllib3 which opens a url (via ... 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 - PIL image show() doesn't work on windows 7

I would like to show an image using python on windows and other platforms. When I do: from PIL import ... PIL that would work crossplatform? See Question&Answers more detail:os...

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

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508 views

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python - How do I plot just the positive error bar with pyplot.bar?

I'm trying to plot 4 average values with positive error bars and the max value within the plot. ... suggestions 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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299 views

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python - Type hints: Is it a bad practice to alias primitive data types?

In Python documentation for typing & type hints we have the below example: Vector = List[float] def scale ... new-features/#annotated-type-hints 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 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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395 views

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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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377 views

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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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269 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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279 views

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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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406 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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412 views

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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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850 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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