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Proper way to declare custom exceptions in modern Python?
...tionError(Exception):
def __init__(self, message, errors):
# Call the base class constructor with the parameters it needs
super(ValidationError, self).__init__(message)
# Now for your custom code...
self.errors = errors
That way you could pass dict of error me...
Python's equivalent of && (logical-and) in an if-statement
... different name in Python.
The logical operators && and || are actually called and and or.
Likewise the logical negation operator ! is called not.
So you could just write:
if len(a) % 2 == 0 and len(b) % 2 == 0:
or even:
if not (len(a) % 2 or len(b) % 2):
Some additional information (...
Create singleton using GCD's dispatch_once in Objective-C
...the type.
– Fattie
Nov 18 '13 at 17:32
1
It's not clear to me what the two snippets mean here, ar...
demystify Flask app.secret_key
If app.secret_key isn't set, Flask will not allow you to set or access the session dictionary.
2 Answers
...
How can I list all commits that changed a specific file?
Is there a way to list all commits that changed a specific file?
16 Answers
16
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Remove columns from dataframe where ALL values are NA
I'm having trouble with a data frame and couldn't really resolve that issue myself:
The dataframe has arbitrary properties as columns and each row represents one data set .
...
Checkboxes in web pages – how to make them bigger?
The standard checkboxes rendered in most browsers are quite small and don’t increase in size even when a larger font is used. What is the best, browser-independent way to display larger checkboxes?
...
PHP & mySQL: Year 2038 Bug: What is it? How to solve it?
.... Instead of asking my question in bulk, I preferred to break it up into small parts so that it is easy for novice users to understand as well. So my question(s):
...
node.js fs.readdir recursive directory search
... search using fs.readdir? I realise that we could introduce recursion and call the read directory function with the next directory to read, but am a little worried about it not being async...
...
Django - Difference between import django.conf.settings and import settings
...
Also note that all settings names should be upper-case. That is, if your have a var my_var in your settings then this will fail: from django.conf import settings... settings.my_var. But if you name it MY_VAR it will succeed!
...