Recent questions tagged PYTHON

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python - How do I modify the session in the Django test framework

My site allows individuals to contribute content in the absence of being logged in by creating a User based on the ... it doesn't seem 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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488 views

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python - Use datetime.strftime() on years before 1900? ("require year >= 1900")

I used : utctime = datetime.datetime(1601,1,1) + datetime.timedelta(microseconds = tup[5]) last_visit_time = "Last ... make it? Thanks a lot! See Question&Answers more detail:os...

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

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206 views

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python - Django MySQL error when creating tables

I am building a django app with a MySQL DB. When I run 'python manage.py migrate' for the first time, ... 'Cannot add foreign key constraint') See Question&Answers more detail:os...

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

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378 views

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python - Boto - Uploading file to a specific location on Amazon S3

This is the code I'm working from import sys import boto import boto.s3 # AWS ACCESS DETAILS AWS_ACCESS_KEY_ID ... rather than the bucket root? See Question&Answers more detail:os...

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

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871 views

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python - How can I solve system of linear equations in SymPy?

Sorry, I am pretty new to sympy and python in general. I want to solve the following underdetermined linear system of ... + y + 2z = 3 See Question&Answers more detail:os...

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

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180 views

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python - What's the difference between nan, NaN and NAN

In numpy there are nan, NaN and NAN. What's the sense of having all three, do they differ or any of these can be used interchangeably? 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 - Unpacking generalizations

PEP 448 -- Additional Unpacking Generalizations allowed: >>> LOL = [[1, 2], ['three']] >>> [*LOL[0], ... , what's the problem with that syntax? 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 - Difference between frompyfunc and vectorize in numpy

What is the difference between vectorize and frompyfunc in numpy? Both seem very similar. What is a typical use ... not covered by vectorize... See Question&Answers more detail:os...

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

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325 views

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python - How take a random row from a PySpark DataFrame?

How can I get a random row from a PySpark DataFrame? I only see the method sample() which takes a ... something like this on a DataFrame? 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 you get the current text contents of a QComboBox?

Using pyqt4 and python 2.6, I am using a qcombobox to provide a list of options. I am having problems ... mainLayout.addWidget(combobox1, 0, 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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613 views

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python - Sharing Memory in Gunicorn?

I have a large read-only data structure (a graph loaded in networkx, though this shouldn't be important) that ... have to waste so much memory? See Question&Answers more detail:os...

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

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531 views

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python - Django: Can I create a QueryDict from a dictionary?

Imagine that I have a dictionary in my Django application: dict = {'a': 'one', 'b': 'two', } Now I want ... I make the second to last line 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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python - ValueError: cannot switch from manual field specification to automatic field numbering

The class: class Book(object): def __init__(self, title, author): self.title = title self.author = author ... have to restart all over again. See Question&Answers more detail:os...

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

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282 views

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python - How to export figures to files from IPython Notebook

I use the IPython Notebook with the --pylab inline option, since I don't want plots to show up in a ... am also interested in PDF export. See Question&Answers more detail:os...

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

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306 views

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python - TypeError: Required argument 'outImg' (pos 6) not found

When I run my python code import numpy as np import cv2 import matplotlib.pyplot as plt img1 = cv2.imread('/ ... I am using python3 and opencv3 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 - Error 111 connecting to localhost:6379. Connection refused. Django Heroku

I am able to run redis locally and everything works. However when I deploy to heroku I get this error: Error ... not even defined in worker.py? See Question&Answers more detail:os...

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

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199 views

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python - import function from a file in the same folder

I'm building a Flask app with Python 3.5 following a tutorial, based on different import rules. By looking ... same folder. Thanks in advance See Question&Answers more detail:os...

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

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221 views

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python - Is there a method that tells my program to quit?

For the "q" (quit) option in my program menu, I have the following code: elif choice == "q": print() ... , can you think of another 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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564 views

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python - How do I mock a django signal handler?

I have a signal_handler connected through a decorator, something like this very simple one: @receiver(post_save, ... works as expected. See Question&Answers more detail:os...

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

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206 views

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python - Installing h5py on an Ubuntu server

I was installing h5py on an Ubuntu server. However it seems to return an error that h5py.h is not found. It ... -gcc' failed with exit status 1 See Question&Answers more detail:os...

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

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272 views

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python 2.7 - Scrapy get request url in parse

How can I get the request url in Scrapy's parse() function? I have a lot of urls in start_urls and some of ... urls. I'm using the BaseSpider. 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 3.x - Create new folder with pathlib and write files into it

I'm doing something like this: import pathlib p = pathlib.Path("temp/").mkdir(parents=True, exist_ok=True) with ... is required (got type str) 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 - Limit number of characters with Django Template filter

I am trying to output the first 255 characters of a description on a list of items and am looking for a method ... the time to do that. 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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607 views

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python - When using pathlib, getting error: TypeError: invalid file: PosixPath('example.txt')

I'm using Python 3's pathlib module, like this: from pathlib import Path filename = Path(__file__).parent / " ... But on my machine it works. See Question&Answers more detail:os...

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

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258 views

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python - Add element to a JSON file?

I am trying to add an element to a json file in python but I am not able to do it. This is what I tried ... ] How should I add the new element? See Question&Answers more detail:os...

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

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244 views

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python - Why is Django throwing error "DisallowedHost at /"?

I am setting up my own Django server using this Digital Ocean tutorial. I created the Django framework following ... ) Why is this happening? See Question&Answers more detail:os...

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

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380 views

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python - ImportError: No module named google.protobuf

I am following this guide and using the exact sample of addressbook.proto. Post the content of compiler ... site-packages (from google) See Question&Answers more detail:os...

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

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305 views

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python - How to convert current date to epoch timestamp?

How to convert current date to epoch timestamp ? Format current date: 29.08.2011 11:05:02 See Question&Answers more detail:os...

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

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