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by: Skip Montanaro |
last post by:
I got to wondering if there is a difference between __contains__() and
has_key() for dictionaries (I don't think there is), so I peeked at
UserDict.UserDict and saw they were implemented as distinct methods:
def has_key(self, key):
return self.data.has_key(key)
def __contains__(self, key):
return key in self.data
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by: Anand S Bisen |
last post by:
Hello
I have been developing a code that works pretty well on my python 2.3
and now when i am running it on my server where it is programmed to run
it's giving me errors. I have been using __contains__ method and it
fails on python 2.2
For example
(Python 2.3)
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by: Kamen Yotov |
last post by:
hi all,
i first posted this on
http://msdn.microsoft.com/vcsharp/team/language/ask/default.aspx
(ask a c# language designer) a couple of days ago, but no response so far...
therefore, i am pasting it here as well... enjoy!
(you can skip to the source at the end of the message if you like...)
Consider:
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by: Raymond Hettinger |
last post by:
Proposal
--------
I am gathering data to evaluate a request for an alternate version of
itertools.izip() with a None fill-in feature like that for the built-in
map() function:
>>> map(None, 'abc', '12345') # demonstrate map's None fill-in feature
The motivation is to provide a means for looping over all data elements
|
by: Raymond Hettinger |
last post by:
I am evaluating a request for an alternate version of itertools.izip()
that has a None fill-in feature like the built-in map function:
>>> map(None, 'abc', '12345') # demonstrate map's None fill-in feature
The movitation is to provide a means for looping over all data elements
when the input lengths are unequal. The question of the day is whether
that is both a common need and a good approach to real-world problems.
The answer to...
|
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by: David Isaac |
last post by:
I have a subclass of dict where __getitem__ returns None rather than
raising KeyError for missing keys. (The why of that is not important for
this question.)
I was delighted to find that __contains__ still works as before
after overriding __getitem__. So even though instance
does not raise KeyError, I still get (as desired) 'key' in instance ==
False.
Looking forward:
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by: rconradharris |
last post by:
A co-worker of mine came across some interesting behavior in the
Python interpreter today and I'm hoping someone more knowledgeable in
Python internals can explain this to me.
First, we create an instance of an Old-Style class without defining a
__contains__ but instead define a __getitem__ method in which we raise
KeyError. Next we repeatedly use the 'in' operator to test to see
whether something, a string, an int, etc is an attribute...
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by: sebastien.lannez |
last post by:
Thanks for your quick response.
Using Python as an algebraic parser for
symbolic mathematical equation and I need
that the 'in' operator returns an object based
on its two arguments.
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by: eboy98 |
last post by:
if i have a dictionary name number ....and i want to ask the list
whether a particular key already
exists.
{'octal': '1234567', 'binary': '10100101', 'decimal': '1234567890',
'hexadecimal': '1-9,a-f'}
i got error..after execute
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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