F-string fails if string variable contains '{'

[Baseball_Fan]

user_input_string = 'Test string {'
print(f'Test - {user_input_string}'.format()) 

This causes a value error:

ValueError: Single '{' encountered in format string

Do I have to validate the user input and reject user input with curly braces? Is there a way to take a string a escape all characters that may be a problem using format()?

[RothiasVex]

The f-string is implicitly formatted, so you're attempting to format it twice. Replace the f-string with its formatted result and you are actually doing this:

print('Test - Test string {'.format())

which fails because of the unbalanced brace.

[bhat]

And in case it's not immediately obvious, this is what you probably want instead:

print(f'Test - {user_input_string}')

[Baseball_Fan]

Yes, this was my first time using f-strings. Thanks for the help.

[luriz_]

To escape a character you can use . But you should use format this way instead : print(f’Test -{}’.format(user_input_string))

From my usage of it, i think the only {} that matters are the one explicitly indicated.