Allow users to define a variable, and replacing with the values

Question

I have a string that a user entered s = "my name is {name} and my age is {age}" and I am trying to have {name} and {age} replaced by other strings.

In the case of a single variable name="bob", using .replace('{name}', 'bob') would be simple if it was only {name}, but I am aiming to have around 10-15 different variables, which would complicate things.

The variable could be at any position in the string, I am also getting the string from a database d = {'name': 'bob', 'age': 18}, so f-strings can't be used.

This is why they created [f-strings](https://docs.python.org/3/tutorial/inputoutput.html#formatted-string-literals). — MattDMo, May 08 '21 at 15:51
Your string will have to have ‘keys’ that they should replace, like {name} - so your database will have to store the keys because how else could you work out which variable to replace with what value? — DisappointedByUnaccountableMod, May 08 '21 at 15:55
Please give some totally specific minimal but representative example of the string you want things replaced in, *and* the information that will be stored in the database that gives you enough information to do the replacement — DisappointedByUnaccountableMod, May 08 '21 at 15:57
The information that would be stored is just the string, for example "My name is {name} and I am {age}" — editid, May 08 '21 at 15:59

score 5 · Accepted Answer · edited May 21 '21 at 10:39

5

You can expand a dict into str.format().

s = "my name is {name} and my age is {age}"
d = {'name': 'bob', 'age': 18}
print(s.format(**d))  # -> my name is bob and my age is 18

Related: How do I create variable variables?

edited May 21 '21 at 10:39

divenex

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answered May 08 '21 at 16:00

wjandrea

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Allow users to define a variable, and replacing with the values

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