How do I get the object if it exists, or None if it does not exist in Django?
When I ask the model manager to get an object, it raises DoesNotExist when there is no matching object.
Python
Safely evaluate simple string equation
I’m writing a program in which an equation is inputted as a string, then evaluated. So far, I’ve come up with this:
SyntaxError: Non-UTF-8 code starting with ‘x91’
I am trying to write a binary search program for a class, and I am pretty sure that my logic is right, but I keep getting a non-UTF-8 error. I have never seen this error and any help/clarification would be great! Thanks a bunch.
How to show all columns’ names on a large pandas dataframe?
I have a dataframe that consist of hundreds of columns, and I need to see all column names.
Could not find a version that satisfies the requirement
I’m installing several Python packages in Ubuntu 12.04 using the following requirements.txt file:
Subsetting a 2D numpy array
I have looked into documentations and also other questions here, but it seems I
have not got the hang of subsetting in numpy arrays yet.
Representing graphs (data structure) in Python
How can one neatly represent a graph in Python? (Starting from scratch i.e. no libraries!)
What data structure (e.g. dicts/tuples/dict(tuples)) will be fast but also memory efficient?
One must be able to do various graph operations on it.
trying creating dropdown menu pygame, but got stuck
So so far here’s my code:
How does python interpret numbers with leading zeroes
I’m new with python, I’m using python 2.7
when I typed this on python shell: