473,657 Members | 2,538 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

function for counting items in a sequence

Alex Martelli wrote:
If we had a "turn sequence into bag" function somewhere
(and it might be worth having it for other reasons):

def bagit(seq):
import collections
d = collections.def aultdict(int)
for x in seq: d[x] += 1
return d
I use this function all the time -- I call it dicttools.count (). I'd
love to see this appear in the collections module or somewhere else in
the stdlib.

STeVe
Apr 5 '07 #1
1 1150
Steven Bethard <st************ @gmail.comwrote :
Alex Martelli wrote:
If we had a "turn sequence into bag" function somewhere
(and it might be worth having it for other reasons):
>
def bagit(seq):
import collections
d = collections.def aultdict(int)
for x in seq: d[x] += 1
return d

I use this function all the time -- I call it dicttools.count (). I'd
love to see this appear in the collections module or somewhere else in
the stdlib.
Maybe you should propose it in python-dev -- it does seem a reasonable
utility addition to the collections module, after all.
Alex
Apr 5 '07 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

6
1514
by: M. Clift | last post by:
Hi All, I have tried to come up with a way to do this myself and all I end up with is very long code. What I have is a say item1, item4, item2, item1 etc... What I want to do is append to each item an extra value depending on the previous item.
10
5664
by: Steve Goldman | last post by:
Hi, I am trying to come up with a way to develop all n-length permutations of a given list of values. The short function below seems to work, but I can't help thinking there's a better way. Not being a computer scientist, I find recursive functions to be frightening and unnatural. I'd appreciate if anyone can tell me the pythonic idiom to accomplish this. Thanks for your help,
16
1892
by: It's me | last post by:
Okay, I give up. What's the best way to count number of items in a list? For instance, a=,4,5,] I want to know how many items are there in a (answer should be 7 - I don't want it to be 4)
18
2931
by: ChadDiesel | last post by:
I appreciate the help on this group. I know I've posted a lot here the last couple of weeks, but I was thrown into a database project at my work with very little Access experience. No other employee knows anything about Access. I've searched Google Groups, and that has been a lot of help, but there are some questions that I just can't find the answer to. I'll try to take it easy on the group after this question. I have one more...
13
2845
by: subnet | last post by:
What does the standard say about this: #include <stdio.h> void somefunc(int a, int b, int c) { printf("%d %d %d\n", a, b, c); } int main(void) { int i = 5;
35
2446
by: michael.casey | last post by:
The purpose of this post is to obtain the communities opinion of the usefulness, efficiency, and most importantly the correctness of this small piece of code. I thank everyone in advance for your time in considering this post, and for your comments. I wrote this function to simplify the task of combining strings using mixed sources. I often see the use of sprintf() which results in several lines of code, and more processing than really...
16
2441
by: mdh | last post by:
May I ask the group the following: (Again, alas , from K&R) This is part of a function: while ( ( array1 = array2 ) != '\0' ); /* etc etc */ Is this the order that this is evaluated? -> array2 is assigned to array1 ....???? the reason being it is
3
2071
by: newstips6706 | last post by:
The Art of Counting TIME -------------------------------------------------------------------------------- As the research done on the paper titled: "The Number '1'", which yielded the following results: WHAT passes through this PERFECT MIRROR, PI , that reflects off , PI to give "a mirror image of " PI known as: "The Number '1'?
10
2344
by: Dmitriy V'jukov | last post by:
On 16 ÍÁÊ, 21:41, "Dmitriy V'jukov" <dvyu...@gmail.comwrote: According to definition, release operation on 'std::atomic_global_fence_compatibility' can only 'synchronize with' acquire operation on 'std::atomic_global_fence_compatibility'. Imho, it's a bit senseless. I think that I miss something. Can somebody clarify about std::atomic_global_fence_compatibility?
0
8413
marktang
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...
0
8842
Oralloy
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...
1
8513
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,...
0
8617
tracyyun
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...
1
6176
isladogs
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...
0
5642
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
4173
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
4330
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
2
1733
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.