Python: not all arguments converted during string formatted

Question

import datetime

now = datetime.date.today()
now = str(now)
index = open('/var/www/index.html', 'a')
index.write('<br> $s,' %now)
index.close()

I keep getting the error.

Answer 1

You need to use the correct format:

index.write('<br> %s,' %now)

That's %s, not $s.

Answer 2

index.write('<br> {now},'.format(now=now))

.format is much better than string-formatting see this