why does the slices read only the first and last line , skipping the line between them

Question

I can't correctly capture (read) the text received from the user why is the data from the fill-in form not being read correctly? thank you in advance

I can 't understand the reason , where did I make a mistake ?

text = str(settings.tg_message)
          Name : { name }
          Phone : { phone }
          Vacancy : { vacancy }


    a = text.find("{")
    b = text.find("}")
    c = text.rfind("{")
    d = text.rfind("}")
    u = text.find("{")
    p = text.rfind("}")

    part_1 = text[0:a]
    part_2 = text[b + 1:c]
    part_3 = text[d + 1:u]
    part_4 = text[p:-2]

    text_message = part_1 + tg_name + part_2 + tg_phone + part_3 + tg_vacancy + part_4

desired result:

Name : john
Phone : +359557664848
Vacancy : courier

output:

Name : Jhon
Phone : { phone }
Vacancy : +359557664848courier

Answer 1

The main problem is that you work with indexes, and thus search the first and last indexes for { and }. This thus means that no item in the middle can be used.

That being said, using such string manipulation will be very error prone: even if you manage to get this working, it is very sensitive to template changes: if for example you swap the order of the variables in the template, or omit one, it will start failing.

Moreover, you don't need this. Django already has a template render engine that you can use.

I would rewrite the tg_message setting to:

Name : {{ name }}
Phone : {{ phone }}
Vacancy : {{ vacancy }}

and then we can let Django do all the work:

from django.template import Context, Template

template = Template(settings.tg_message)

text_message = template.render(
    Context({'name': 'John', 'phone': '+359557664848', 'vacancy': 'courier'})
)