python - Conditionally parsing a string -


i'm working on small script compile csv file.

i've come code combine string.

site = "{}.{}".format(subdomain, fulldomain)

however there situation subdomain may not exist. if case, output ".domain.tld" not correct.

i wondering if there condition can add in format instruction above, or simpler check output , remove dot @ beginning if any.

thanks

how pretty straightforward one-liner?

"{}{}{}".format(subdomain, '.' if subdomain else '', fulldomain)

and can name each format item like:

"{subdomain}{dot}{fulldomain}".format(subdomain=subdomain,                                        dot='.' if subdomain else '',                                        fulldomain=fulldomain)

or, can go way:

"{}{}".format(subdomain + '.' if subdomain else '', fulldomain)

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