python

Question: Question: Why does if 1 & 5 return True in Python, but if 2 & 5 does not return True? I couldn't find the answer even after thinking about it, so please let me know. Thank you. Answer: Answer: In Python, & is a bitwise AND, so let's consider …

python – Why is "if 1 & 5" True? Read More »

Question: Understanding the os module. The os.name attribute contains one of the following values: posix, nt, os2, ce, java, riscos. Posix, nt, os2, rscos – this is understandable. What do the rest, java and ce mean? Didn't find an explanation in the docs Answer: There are many different implementations of …

python – What do the values ​​of the os.name attribute mean? Read More »

Question: To use a field similar to HTML input in Pyqt4, I usually use QtGui.QLineEdit . But how can I make a field similar to the input password, which is a specific field for entering passwords? Is there a way to define the "asterisks" that hide the text typed in …

python – How to make an input password (password field) in PyQt4? Read More »

Question: Good afternoon. Now I started to read in depth about hashes and hash tables. And there was one question that puzzled me. As you know, in python, the hash of an integer is the number itself. However, if I understand correctly, such a hash function should be considered very …

Hashes of integers in Python Read More »

Question: Question: For the depiction in pylab, when I run it as follows, the module comes out that figure cannot be used. pylab uses the latest version with $pip install –upgrade pylab . Not only pylab.figure() , but also pylab.plot() , pylab.show() , etc. will throw similar errors. I would …

python – Pylab figure () is no longer available Read More »

Question: I'm doing an api test, which I pass a json it validates if everything is ok: my base class: # -*- coding: utf-8 -*- # base.py import os import unittest from app import initialize from mock import mock from flask import Flask from flask.ext.sqlalchemy import SQLAlchemy from app import …

python – Start and Drop Bank in flask test Read More »

Question: Using Python, how do I check if a file exists, without using the try statement. original question : Check whether a file exists using Python by spence91 Answer: You can use os.path.isfile : Returns True if the path is an existing regular file. Follow symbolic links, so islink() and …

How to check that a file exists in Python? Read More »

Question: Question: I'm trying to build using Windows powershell, When you create a virtual environment file with the same name in two types of files, Desktop \ file1 \ env and Desktop \ file2 \ env, file1 \ env \ Scripts \ python.exe ・ ・ ・ ① file2 \ env …

python – Will the virtual environment created in the directory with the same name by venv be the same environment? Read More »

Question: Wrote the code: array = pd.DataFrame(np.object, index=[], columns=[]) array = array.append({‘Project’: b.name, ‘Summary’: card.name, \ ‘Key’: card.id, ‘Assignee’: m, ‘Points’: s}, \ ignore_index=True) array1 = pd.read_excel(‘ProjectCostUCP.xlsx’, ‘Лист1’) result = array[[‘Project’, ‘Assignee’, ‘Points’]].groupby([‘Project’, ‘Assignee’]).sum(axis=1) print(result.columns.tolist()) result = result.merge(array1, on=[‘Project’]) result[‘Value’] = result.Points * result.Price writer = pd.ExcelWriter(‘third.xlsx’) array.to_excel(writer, “June”) result.to_excel(writer, …

python – Merge two DataFrame tables, aggregate data using pandas Read More »

Question: There is a leaf list_1 = [‘a’, ‘b’, ‘c’] Values ​​should be replaced like this list_1 = [‘element_1’, ‘element_2’, ‘element_3’] Starting from 1 and not 0 I tried to do it like this list_1 = [‘element_{}’.format(i) for i in range(i+1, len(list_1))] or so list_1 = [‘element_{}’.format(i) for i in …

python – Replacing elements in a sheet by their index starting from 1 and not 0 Read More »