Tagged Questions
2
votes
1answer
35 views
Matrix of lists - Python
I want to create a matrix of list, but when I create the lists inside the matrix it created a linked list, and I don't need that.
A=[[{}]*3]*3
result: [[{}, {}, {}], [{}, {}, {}], [{}, {}, {}]]
...
0
votes
0answers
17 views
Python - Selenium - Webscrape Table
import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from datetime import datetime, timedelta
from tkinter import StringVar, messagebox, Entry, Tk
...
-2
votes
0answers
38 views
populate the dictionary values [on hold]
please help to fix the script.
import shelve
db = shelve.open('data')
keys = ['id', 'type', 'number'];
def outputDB(db):
for record in db:
print(record, ': ', db[record])
for ...
0
votes
1answer
30 views
How to pass variable to SQL in Python
I have a python script like the below. It will receive parameters and will query in DB. However I am not sure how to pass the variable abcd to the SQL statements mentioned below.
abcd = ...
0
votes
0answers
18 views
Python 3 “The _imagingft C module is not installed”
I want to use django-simple-captcha in my web site. I went through installation guide in official site but captcha image doesn't load in borrowser and this error appears in console: 500 (INTERNAL ...
2
votes
1answer
29 views
python “__package__” attribute explained
I'm sorry if I raised a dumb question.
All I want to know is what exactly does __package__ mean? Didn't find any explanation in the official doc, even on SO.
If you could provide some examples I ...
2
votes
1answer
34 views
Use a metaclass only for subclasses
Is there a way in Python 3.2 or later to define a class whose subclasses should be created using a specific metaclass without the class itself being created using that metaclass?
An example to ...
3
votes
2answers
46 views
Printing until a specific character position in python
First I apologize if this is a question that has been answered many times, I searched around a while for an answer, but much of what I found went over my head since I am just beginning to learn ...
1
vote
2answers
46 views
How do Arguments and Parameters Work in Python? [on hold]
I have looked all over Stackoverflow and I can't find an answer, and all the web tutorials just go right over my head. I have a functioning code that I don't understand
import random
import time
def ...
-4
votes
1answer
50 views
How to restart code if input entered = 'y'
I'm making a Python software to encrypt/decrypt/brute force messages, but I need to know how to restart the code at the end, so like at the end it will ask you "Would you like to continue? y/n" If the ...
0
votes
2answers
55 views
invalid syntax on =? [on hold]
i am a beginner at python trying to make a very simple program using yes/no. it says that there is a syntax error on the first = in the line:
if monkeya="yes" and monkeyb="yes":
here's my entire ...
3
votes
4answers
54 views
Writing bits to a binary file
I have 23 bits represented as a string, and I need to write this string to a binary file as 4 bytes. The last byte is always 0. The following code works (Python 3.3), but it doesn't feel very elegant ...
0
votes
1answer
39 views
implement the dictionary entry
please help to fix the script. it should provide an opportunity to introduce a new element of the dictionary.
keys = ['id', 'type', 'number'];
rec1 = {'id': 1, 'type': 'c', 'number': 111}
rec2 = ...
2
votes
2answers
58 views
Python2 “raise e[0], e[1], e[2]” and python3 version in one file
I've found that python 3 equivalent of:
raise e[0], e[1], e[2]
will look something like this:
raise e[0](e[1]).with_traceback(e[2])
But I get either syntax error for the 1st (in python 3) or ...
0
votes
1answer
29 views
Can't get new line to work in python?
This is the code that i'm currently using to try to get a new line. Sadly it just rewrites the first line in the program. What is going on? If you can help I will be very thankful.
import itertools
...
1
vote
1answer
46 views
exe file doesn't work properly (nothing happens)
When I compile my file (snake.py) to exe, the output file (exe file) doesn't work.
I thought this may be as a result of the error that occurs during compiling:
missing modules:
? _frozen_importlib ...
1
vote
3answers
37 views
Do python modules get imported twice?
If I have one file that runs import math, and a second file that also has import math AND which imports the first file, does that load the math module twice in memory?
0
votes
1answer
26 views
Virtualenv doesn't install pip
I have installed python3 via homebrew, updated pip & setuptools, installed virtualenv via pip. Now I'm trying to create a virtual env. Unfortunately, I can't get it to add pip to the virtualenv. ...
0
votes
1answer
17 views
reading data from stackoverflow rest api
Playing around with the raspberry pi and python. so bear with me :)
When trying to decode the response data from the stackoverflow api I keep on receiving the error utf-8 codec can't decode byte 0x8b ...
0
votes
1answer
13 views
Converting SQL data into a QTextDocument and then outputting a pdf
I am trying to add a way to export data from an sqlite3 database into a pdf document. In the book rapid gui programming with python and Qt it says that I can export QTextDocuments as pdf files. ...
0
votes
0answers
20 views
Python 3, converting string to bytestring
I'm trying to create a function that will XOR two bytes in python 3. This works, and I get a string that looks like a bytes out of it, but it says it isn't bytes (if I print it it doesn't have the b ...
1
vote
1answer
32 views
What is the convention in referring to a non-overridden superclass method from within the subclass?
Which of these is preferred? I believe they are identical in outcome.
self.inheritedMethodName(arguments)
Or:
ParentClass.inheritedMethodName(self, arguments)
I am aware there is also:
...
0
votes
2answers
30 views
Different output format than expected
I have written code to read following text file
Generated by trjconv : a bunch of waters t= 0.00000
3000
1SOL OW 1 -1.5040 2.7580 0.6820
1SOL HW1 2 1.4788 2.7853 ...
-1
votes
0answers
20 views
A multicolumns listbox with tkinter and Python 3.3 [on hold]
I'm trying, as the title explains, to make a multicolumns listbox with tkinter and Python 3.3.
I'd like something that looks like the following:
How can I do it ?
Thank you in advance
0
votes
1answer
27 views
Raspberry Pi Digital interface python error [on hold]
I created a python script for my Raspberry pi. It interfaces with a digital interface that plugs into the pi's GPIO pins. Though when i run the pi I get this error below. Though when i add """ to ...
0
votes
2answers
23 views
Having trouble running a python program on CMD on windows
Here is the program. It works great on the IDLE but, it crashes after asking if you know the password length. I can't seem to figure out want i'm missing. I would love any help.
import itertools
...
3
votes
3answers
67 views
Is a bad practice to use accent in python class name?
I'm developing an app in Python3 and need to create a class that represent a diary, weel, I want to name it in my language, and it have an accent, is it a bat practice? May I have problems because ...
2
votes
1answer
27 views
Force all iterations on an iterable
I've written a for-loop using map, with a function that has a side-effect. Here's a minimal working example of what I mean:
def someFunc(t):
n, d = t
d[n] = str(n)
def main():
d = {}
...
0
votes
3answers
34 views
concurrent.futures.ThreadPoolExecutor.map is slower than a for loop
I am playing with concurrent.futures.ThreadPoolExecutor to see if I can squeeze more work out of my quad-core processor (with 8 logical cores). So I wrote the following code:
from concurrent import ...
0
votes
1answer
33 views
out of box example does not work on python 3.3 expected bytes str found
from rsa import *
def main():
(bob_pub,bob_pri)=newkeys(512)
message ='Number of bits needed to represent a integer'
crypto = encrypt(message,bob_pub)
message1 = ...
0
votes
2answers
36 views
remove items from 2 dictionaries python 3
I have the following dictionaries:
a = {'f': 2, 'u': 210, 'the': 100, 'too': 300, 'my': 199, 'is': 2466, 'and': 3787}
b = {'f': 9, 'u': 17, 'o': 14, 'the': 23, 'yy': 7, 'and': 12}
I want to remove ...
0
votes
0answers
33 views
Weird error that comes up during python program run
Whenever I run my program I get this error. Do you know what this means?
This happens when the
turtle.clear()
function is called
File "C:\Python32\lib\turtle.py", line 2642, in clear
...
0
votes
1answer
16 views
Insert and update with core SQLAlchemy
I have a database that I don't have metadata or orm classes for (the database already exists).
I managed to get the select stuff working by:
from sqlalchemy.sql.expression import ColumnClause
from ...
0
votes
1answer
28 views
When to use x.__lshift__ and x.__pow__ [on hold]
I am currently studying the methods for each built-in function, many apply to other functions. I came across 2 methods withing the bool() function: x.__lshift__ and x.__pow__. Now, x.__lshift__(y) ...
0
votes
1answer
21 views
Circle and line collision detection in python tkinter
I writing a python program in which a circle bounces off of user drawn lines. There are multiple circles that bounce off the wall. For each one, the shortest distance from the center of the circle and ...
0
votes
2answers
30 views
Consolidate values in CSV with Python 3
I have a csv with two lonely columns. I built them using a Python dict.
Column A is word, Column B is a number
FRUIT INVENTORY
Apple 2
Orange 5
Grape 1
Orange 2
Kiwi 3
Apple 4
As you ...
0
votes
0answers
29 views
PyGame: Sprites In Same List Collision / Smooth Movement
I am making a space survival game, and it has multiple enemies (only meteors currently though more coming soon) and I am trying to make them collide with each other so they don't cluster up together ...
0
votes
4answers
32 views
Python nested select on named property
I have a set of lists such that I have an array of something like this
class engine:
engines = []
def __init__(self):
this.modules = []
class module:
def __init__(self,flag):
...
4
votes
1answer
44 views
How do I allow more simultaneous socket connections?
I'm attempting to implement the Reactor pattern in Python. I think I have a pretty decent start using multiprocessing and select.select. However, I'm trying to stress-test my server, so I wrote a ...
5
votes
3answers
53 views
Workaround for equality of nested functions
I have a nested function that I'm using as a callback in pyglet:
def get_stop_function(stop_key):
def stop_on_key(symbol, _):
if symbol == getattr(pyglet.window.key, stop_key):
...
2
votes
1answer
35 views
Filtering of structured array via bit-wise operation (bitmask) on column data
I have a structured array. One column (event_type) is a bitfield. I would like to filter the data via the event_type.
Previously I used filter() but it produces a list that would need to be back ...
1
vote
1answer
52 views
Getting number of lines in a text file without readlines
Let's say I have a program that uses a .txt file to store data it needs to operate. Because it's a very large amount of data (just go with it) in the text file I was to use a generator rather than an ...
0
votes
1answer
23 views
Python - tkinter - How to move messagebox to foreground
from tkinter import messagebox
Tk().withdraw()
acceptInput=messagebox.askquestion("Input Assessment","do you accept this input?")
The askquestion window box is appearing in the background rather ...
0
votes
3answers
70 views
append/insert a value/string to a list element dynamically in Python?
my_list = ['cat','cow','dog','rabbit']
but what I want is to append/insert a character(or string) to one or more element(not all).
something like
my_list = ...
-1
votes
0answers
49 views
python----How to make a variable to change in global
Below is my code. It's simple. I want nothing1 to change. But at present it doesn't change.
You can also help write a new one liking using while/for.
import re
import urllib.request
reg = ...
0
votes
3answers
27 views
Changes in re module between Python 2 and Python 3
I am running my unit test suit with python3.x on a code that was developed under python2.x. All unit tests passed under python2.x but not for python3.x. It seems there is some change in the ...
-3
votes
0answers
63 views
remove space from list of lists in python [on hold]
a= ['Business', 'Food/Clothes', 'Fun', 'Politics',
'Starting_with_Apolog', ['NNP', 'MD', 'NN', 'NNP'], ['NNP', 'NN',
'NNP'], ['PDT', 'MD', 'NN', 'NNP'], ['PRP$', 'MD', 'NN', 'NNP'],
['UH', 'MD', ...
-3
votes
2answers
55 views
Removing single quotes when writing dict to CSV in Python
I've been searching for hours and can't find an answer to what should be a very simple question.
I have a dict...
{'apples' : 'red', 'pears' : 'green', 'bananas' : 'yellow'}
When I try to write ...
3
votes
1answer
46 views
Difference in type() and hasattr() between Python 3 and Python 2
When I am trying to check type of class declaration in Python 3 and Python 2, I get strange results, as followings show,
>>> #python 2.7.6
>>> class MyClass:
... pass
...
...
0
votes
3answers
29 views
Character encoding with Python 3
If I run
print(chr(244).encode())
I get the two-byte result b'\xc3\xb4'. Why is that? I imagine the number 244 can be encoded into one byte!
