473,405 Members | 2,279 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,405 software developers and data experts.

slicing a bsddb table, eg. for rec in bsddb["AArdvark":"zebra"]:print rec

#!/bin/env python
import bsddb

test=bsddb.btopen("test.tbl")
for m in "JFMATQPHSOND":
test[m]="Profit for month "+m+" $1B"

def subyear_report(record_selection):
for data in record_selection.iteritems(): print data

# I was expecting a slice of an index file to yield a
# generator so not all the records need to be read from disk....
subyear_report(test["Apr":"Sep"])

"""
I have tried a few ideas.... but is there a simple way to convert this
["Apr":"Sep"] slice of a file into a generator of the requested records?

(I tried UserDict and got a bit further...)

Any hints?

ThanX
NevilleDNZ
"""

Jul 19 '05 #1
0 967

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

Similar topics

0
by: John D. | last post by:
We are using OpenBSD latest release of Python (2.3), and want to use the "bsddb" module. Our python release has a directory called "bsddb", but when we try and import it, it says >>> import...
0
by: Jane Austine | last post by:
There is a test code named test_env_close in bsddb/test, but it doesn't test the case thoroughly. There seems to be a bug in closing the db environment first -- the lock is not released, and...
3
by: Harry Pehkonen | last post by:
Stats: Python2.3 windows2000 professional If I have ``Full Control'' of a bsddb file, no problem: >>> import bsddb >>> a = bsddb.btopen("c:/sharedrw/db/npanxx2pseudo.db", "r") >>> a.close()...
4
by: Michele Simionato | last post by:
I was browsing through the source tree of Python 2.4b2 and in Lib/bsddb/test I found a lot of interesting stuff. It seems that the support for the bsd database is much better than documented in the...
0
by: Barry | last post by:
I have python2.4.1 installed on two machines: -- one is Fedora core 1, where the bsddb module works fine -- one is Redhat ES 3.0, and I installed mysql 4.1 (and mysql-python2.1) after putting the...
10
by: Omar | last post by:
I'm looking for a programming language or module that sorta looks and feels like MS Excel (I love and think in tables), yet has the power and open-endedness of python or javascript. I'm still...
2
by: lazy | last post by:
Hi, I have a dictionary something like this, key1=>{key11=> , key12=> , .... } For lack of wording, I will call outer dictionary as dict1 and its value(inner dictionary) dict2 which is a...
1
by: BjornT | last post by:
Have a rather big problem with bsddb I can't figure out. I upgraded an Ubuntu machine from 7.05 to 7.10 which upgraded python to 2.5.1 I run a local website that uses bsddb, and suddenly I get a...
2
by: cocobear | last post by:
How to deal with multiple databases in an file. I want to get the content of several databases. it's the code I wrote: $ python Python 2.5.1 (r251:54863, Oct 30 2007, 13:54:11) on linux2...
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
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,...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
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,...
0
jinu1996
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...
0
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...
0
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...

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.