Insert variable name into a string dynamically

Question

Let's say I have a string like this:

s = "blah blah start=0 length=10"

and i have two variables named start = 0 and length = 100. Now, I want to form a new string (or replace the existing string) with:

s = "blah blah start="+str(start)+" length="+str(length)

but I want to do it dynamically, e.g. using the replace() method on string s or something similar and not by typing the above code by hand. That is, I want to form a new string with strings and variable names using python code. The string s changes quite often, as it is a url.

Is this possible?

Eugenio · Accepted Answer · 2021-11-14 10:01:11Z

0

I'd do it using a simple function

def change_blah_str(nstart, nlength):
    return f'blah blah start= {nstart} length= {nlength}'

I hope you like it

answered Nov 14, 2021 at 10:01

Eugenio

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2 Comments

Nick Over a year ago

The string s changes every so often. That' s why I need something like replacing the fixed values with the variable names using a method. I don't want to type again the new string in the method you propose. Thank you anyway.

Eugenio Over a year ago

You don't have to type it again, you just have to do: change_blah_str(10, 20) change_blah_str(15, 25) change_blah_str(40, 2) change_blah_str(53, 4)

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