Functional Programming in Python: When and How to Use It – Real Python

>>> print(f"--- {lambda s: s[::-1]} ---")
  File "<stdin>", line 1
    (lambda s)
             ^
SyntaxError: f-string: invalid syntax

>>> print(f"--- {(lambda s: s[::-1])} ---")
--- <function <lambda> at 0x7f97b775fa60> ---
>>> print(f"--- {(lambda s: s[::-1])('I am a string')} ---")
--- gnirts a ma I ---