Python: Capitalize a word using string.format()
You can pass extra values and just not use them, like this lightweight option
printme = random.choice(["On {date}, {user} did la-dee-dah. ",
"{User} did la-dee-dah on {date}. "
])
output = printme.format(user=x, date=y, User=x.capitalize())
The best choice probably depends whether you are doing this enough to need your own fullblown Formatter
.
As said @IgnacioVazquez-Abrams, create a subclass of string.Formatter
allow you to extend/change the format string processing.
In your case, you have to overload the method convert_field
from string import Formatter
class ExtendedFormatter(Formatter):
"""An extended format string formatter
Formatter with extended conversion symbol
"""
def convert_field(self, value, conversion):
""" Extend conversion symbol
Following additional symbol has been added
* l: convert to string and low case
* u: convert to string and up case
default are:
* s: convert with str()
* r: convert with repr()
* a: convert with ascii()
"""
if conversion == "u":
return str(value).upper()
elif conversion == "l":
return str(value).lower()
# Do the default conversion or raise error if no matching conversion found
return super(ExtendedFormatter, self).convert_field(value, conversion)
# Test this code
myformatter = ExtendedFormatter()
template_str = "normal:{test}, upcase:{test!u}, lowcase:{test!l}"
output = myformatter.format(template_str, test="DiDaDoDu")
print(output)