Override {} placeholders in python string format method

Question

I am trying to use python format method to do format my placeholder in a string.

The issue is the string contains {} internally and the string method is unable to resolve it.

my_value='v'
'{"k":"{value}"}'.format(value=my_value)    # This results in error due to outside {}
# Desired Output '{"k":"v"}'

How would I resolve this ?

• I can convert this to json and then substitute but I prefer if the string format can do it

Answer 1

You don't need to override something, you can just escape the curly brackets by doubling them, as stated in the documentation for the format string syntax:

If you need to include a brace character in the literal text, it can be escaped by doubling: {{ and }}.

>>> '{{"k":"{value}"}}'.format(value=my_value)
'{"k":"v"}'

This equally applies for formatted string literals if you plan on using them at some point:

>>> f'{{"k": "{my_value}"}}'
'{"k": "v"}'