This post some useful tips of using strings, and some issues while dealing with strings

Hope, you have seen Python string format

How to add Curly-braces to string in string format

It works perfectly find with following cases

print('{hi}')

print('{hi} %s' %('hi'))

But, not with

website='GyanBlog.com'
print(f'hi { {website} .com}')

You have to use Double Curly-braces

website='GyanBlog.com'

print(f'hi {{ {website} .com}}')