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How to check if all elements of a list matches a condition?
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The best answer here is to use all(), which is the builtin for this situation. We combine this with a generator expression to produce the result you want cleanly and efficiently. For example:
>>> items = [[1, 2, 0], [1, 2, 0], [1, 2, 0]]
>>...
super() fails with error: TypeError “argument 1 must be type, not classobj” when parent does not inh
...ss. Change it like so:
class B(object):
and it will work.
super() and all subclass/superclass stuff only works with new-style classes. I recommend you get in the habit of always typing that (object) on any class definition to make sure it is a new-style class.
Old-style classes (also known as...
What is PECS (Producer Extends Consumer Super)?
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Hey everyone. I'm Andrey Tyukin, I just wanted to confirm that anoopelias & DaoWen contacted me and obtained my permission to use the sketch, it's licensed under (CC)-BY-SA. Thx @ Anoop for giving it a second life^^ @Brian Agnew: (on "few votes"): That's because it's a ...
how to get the current working directory's absolute path from irb
...ing Ruby on Windows though I don't know if that should make a difference. All I want to do is get the current working directory's absolute path. Is this possible from irb? Apparently from a script it's possible using File.expand_path(__FILE__)
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How does Django's Meta class work?
I am using Django which allows people to add extra parameters to a class by using class Meta .
6 Answers
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What MIME type should I use for CSV?
...st accept ".csv" file types. But the ".txt" files also get accepted.Please confirm.
– SukanyaPai
Mar 25 '19 at 6:08
1
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When I catch an exception, how do I get the type, file, and line number?
...Error:
print(traceback.format_exc())
Output
Traceback (most recent call last):
File "/path/to/file.py", line 51, in <module>
print(4/0)
ZeroDivisionError: division by zero
Process finished with exit code 0
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What is the largest Safe UDP Packet Size on the Internet
... are) dropped. You cannot "rely" on any specific packet arrival, order, or confirmation. Data is fragile, and it's like saying car steering that works 99% of the time, and 89% in the right direction, is reliable. Not that UDP isn't great for many things, just that it requires you to basically write ...
Method Resolution Order (MRO) in new-style classes?
...ject'>)
with A forced to come in resolution order only once and after all of its subclasses, so that overrides (i.e., C's override of member x) actually work sensibly.
It's one of the reasons that old-style classes should be avoided: multiple inheritance with "diamond-like" patterns just doesn...
Use RSA private key to generate public key?
...mponents. If you stare at both outputs long enough
# you should be able to confirm that all components are
# indeed lurking somewhere in the binary stream
openssl rsa -in private.pem -text -noout | less
This structure of the RSA private key is recommended by the PKCS#1 v1.5 as an alternative (seco...