473,836 Members | 1,586 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Yet another string interpolation function...

There are several string interpolation functions, as well as
string.Template . But here's yet another. This one emulates ruby's
inline interpolation syntax (using #{}), which interpolates strings as
well as expressions. NB. It uses eval(), so only use it in trusted

import sys, re
def interp(string):
locals = sys._getframe(1 ).f_locals
globals = sys._getframe(1 ).f_globals
for item in re.findall(r'#\ {([^{]*)\}', string):
string = string.replace( '#{%s}' % item,
str(eval(item, globals, locals)))
return string

test1 = 'example'
def tryit():
test2 = 1
# variable interpolation
print interp('This is an #{test1} (and another #{test1}) and an int
# expression interpolation
print interp('This is an #{test1 + " (and another " + test1 + ")"}
and an int (#{test2})')



Ok, now tell me all the things wrong with it! ;)


Mar 4 '07 #1
0 1292

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

Similar topics

by: Eli Daniel | last post by:
Hi, I'm new to Python. Can you please tell me if the following is possible. My users are using other scripting launguage to write scripts. They are used to write somthing like (keeping it simple) T = 100 do_action ('It cost $T dollars')
by: Michele Simionato | last post by:
This is somewhat in between a bug report and a feature request. I was using the new string.Template class and I have run into a few issues that I traced back to the usage of the idiom '%s' % val in the 'convert' helper function in Template.substitute. I do not understand why '%s' % val was used instead of just str(val).
by: Charles Banas | last post by:
I'm not sure if this is the right place to ask about this, but I've seen several posts in the past regarding Akima's Bivariate Interpolations routines, and i'm wondering if someone can give me some ideas or PD code I can put to use right away. At the moment, I'm maintaining a contour calculation and plotting program for radio wave propagation studies. This program uses a number of routines written by and for the FCC in Fortran in 1976...
by: Jonas Ernst | last post by:
Hi, Can somebody give me some hints how to do a line interpolation without using floating point arithemtics? The function shall do a linear interpolation between 2 points (line interp?) and it shall return the y value to any x value given. e.g. p1: (0,0) p2 (1000,50) y value to calculate at x=600
by: Kun | last post by:
I have an html form that takes dates and inserts them into a mysql file. Currently, users have to type in dates in the yyyy-mm-dd format. As of now, this process works with the sql. However, I would like to make this process easier by: 1) providing drop down menus for year, month, and date respectively. in a failed attempt, i tried made 3 drop down lists (dateyear, datemonth, dateday) respectively and then used string interpolation...
by: linnorm | last post by:
I've got a bit of code which has a dictionary nested within another dictionary. I'm trying to print out specific values from the inner dict in a formatted string and I'm running into a roadblock. I can't figure out how to get a value from the inner dict into the string. To make this even more complicated this is being compiled into a large string including other parts of the outer dict. mydict = {'inner_dict':{'Value1':1, 'Value2':2},...
by: xandra | last post by:
i understood the concept of interpolation search. but i couldn't understand what would be the steps for that search. for example, if i'm searching for J in this file A A B E F H J M N N N N O P P P P P R R R R T T T Z Z Z Z Z Z Z i know that i have to look in the begining of this file. but what is the steps to find j/ thank you for your help
by: different | last post by:
Hi, I have a program which reads a file containing integers in . The program reads the value of a variable every 2 seconds, then maps it to another interval, say , obtaining a new value. I already have a function which updates the variable, gradually changing from the old one to the new one during the 2 seconds, which uses a linear function. Know I need to make the value of the variable change between old and new in a "logarithmic way",...
by: John Passaniti | last post by:
Hopefully someone can point out what I'm doing wrong. I find myself having to dynamically create HTML code, and have found that the usual way you see to do this is an unreadable mess, like this: blah('<span id="' + id + '"><a href="' + link + '">' + linkText + '</a></span>'); So instead, I would like to do something more like the variable interpolation in Perl and other languages:
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: 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...
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();...
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...
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
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.