building strings from variables

[Matthew Warren]

> -----Original Message-----
> From: 
> python-list-bounces+matthew.warren=digica.com at python.org 
> [mailto:python-list-bounces+matthew.warren=digica.com at python.o
> rg] On Behalf Of Gal Diskin
> Sent: 05 October 2006 16:01
> To: python-list at python.org
> Subject: building strings from variables
> 
> Following a discussion with an associate at work about various ways to
> build strings from variables in python, I'd like to hear your opinions
> and preferred methods. The methods we discussed are:
> 1.  some_string = "cd %s ; %s  %d %s %s" % ( working_dir, ssh_cmd,
> some_count, some_param1, some_param2)
> 
> 2. import string
>     template = string.Template("cd $dir ; $cmd $count $param1
> $param2")
>     some_string = template.substitute(dict(dir=working_dir,
> 
> cmd=ssh_cmd,
> 
> count=some_count,
> 
> pararm1=some_param1,
> 
> param2=some_param2))
> here you can use a couple of nice tricks by using class.__dict__ and
> globals() \ locals() dictionaries.
> 
> 3. some_string = "cd "+working_dir+" ; "+ssh_cmd+ "
> "+str(some_count)+" "+some_param1+" "+some_param2
> (all these are supposed to produce the same strings)
> 
> Which methods do you know of \ prefer \ think is better because...?
> I will appreciate any opinions about the matter.

:D

I think, it would depend really on what your aims are (readable code,
fast string generation...), and how the vars you want to build the
string from are respresented in your code (is it natural to use a dict
etc..)

I kicked off a conversation similar to this earlier today, and that was
my conclusion after helpful debate & advice.

Matt.


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