Josh Benner wrote:
> I'm writing a function to create a string that gets longer iff an argument
> is defined. In there a more elegant way than nesting all those ifs?
>
> def format_rsync_src_string(args, server="RSYNC"):
> """ Format an rsync source directory string. """
> if args.server is None:
> raise CopyNightlyError("No rsync server provided.")
> src = "{0}::".format(args.server)
> if args.project not None:
> src += "{0}/".format(args.project)
> if args.version not None:
> src += "{0}/".format(args.version)
> if args.build not None:
> src += "Build {0}".format(args.build)
> return src
How about
def format_pairs(pairs):
for template, value in pairs:
if value is None:
break
yield template.format(value)
def format_rsync_src_string(args, server="RSYNC"):
""" Format an rsync source directory string. """
if args.server is None:
raise CopyNightlyError("No rsync server provided.")
return "".join(format_pairs([
("{0}::", args.server),
("{0}/", args.project),
("{0}/", args.version),
("Build {0}", args.build)]))
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