[mythtv-users] Rename a file problems

[David Crawford]

On 10 February 2012 15:36, Raymond Wagner <raymond at wagnerrp.com> wrote:

> On 2/10/2012 09:12, David Crawford wrote:
> > path = '%cn %cc %cN.srt'
>
> Doing this in Python means you've stored that string to the variable
> 'path'.  Now in Python, everything is object, and objects have methods.
> In this particular case, you want to use the 'replace' method, which
> replaces one string with another, and outputs the result.  That is this...
>
> >     path = path.replace('%'+tag, tmp)
>
> In Python, strings are 'mutable', meaning they cannot be changed.  The
> only way to modify the string stored to a variable is to store a new
> string to that variable, as described above.  Except you don't want that
> path string up there.  You want to use this one defined lower...
>
> > '%m-%d_%H-%i-%s_%cN_%T'
>
> So define that to a variable, and replace whatever the bindings can't
> handle.  That's what this does down here.
>
> > for (tag, data) in (('cn', 'channum'),('cc','callsign'),('cN','name')):
> >     tmp = unicode(chan[data]).replace('/','-')
> >     path = path.replace('%'+tag, tmp)
>
> It loops through those three sets of values, setting 'tag' to 'cn', and
> 'data' to 'channum' on the first pass.  The Channel class is configured
> to imitate a dictionary, or map, or associative array, depending on your
> programming language of preference.  When it pulls 'chan[data]', it is
> pulling the value mapped to the string currently stored in the 'data'
> variable, which is 'channum', out of that associative array.
>
> Now you're only trying to use %cN, so there is no need for this
> construct.  You can just do the following directly...
>
> > path = '%m-%d_%H-%i-%s_%cN_%T'
> > chan = Channel(chanid)
> > path = path.replace('%cN', chan.name)
>
> The Channel class makes all of those associative array values also
> available as class attributes.  Attributes are just variables stored
> against an object, and accessed in the same manner as methods (with a
> '.').  Remember, you still need to feed this new, modified path into the
> 'formatPath' method, to get out your desired result.
>
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