Can I make a similar code without f' and {} ? Python 3

Question

hora = input()

idx = hora.index(':')
h = int(hora[:idx])
m = hora[idx+1:idx+3]

if hora.endswith('AM'):
if h < 10:
hora = f'0{h}:{m}'
else:
hora = f'{h}:{m}'
elif hora.endswith('PM'):
hora = f'{h+12}:{m}'

print(hora)

This one converts 12 hr format to 24 hr format, deleting PM or AM and giving us a 24 hr format.

But.

Can I replicate this code with iteratives, slicings and index?

Answer 1

Hi there Zárate, f-strings are the most efficient and readable method of string formatting in python in the present world!

- f-strings are introduced in python 3.6 and is best way for string formatting

- These are some of the best articles on using f-strings:
https://medium.com/swlh/string-formatting-in-python-6-things-to-know-about-f-strings-72fd38d96172

https://realpython.com/python-string-formatting/

- There are a few old methods too, concatenation is a (too much) beginner friendly method
eg: hora = "0"+h+":"+m

- You can use some other oldy methods too (not recommended):

.format()
it was the most widely used string formatting method just before f-strings were indroduced!
eg: hora = "0{0}:{1}".format(h, m)

I Would Recommend Learning and using f-strings because it's the most efficient and readable way to format strings in Python :)

Answer 2

You are actually already kind of using them. You find the index of the colon character iteratively, underneath. You assign the h and m variable by slicing the hora string using the index...

Why would you want to complicate it? :)