Consider this:

```py
from datetime import datetime

now = datetime.now() 
now.strftime("%p") # returns 'PM'
'{0.day}'.format(now) # returns 22

'{0.strftime("%p")}'.format(now)
# gives
# AttributeError: 'datetime.datetime' object has no attribute 'strftime("%p")'

```

This seems to imply that I can't call a class method inside the format (I guess that's what `strftime` is).

What's a workaround for this (assuming I need to call the method inside the string, and keep using a format) ?