MAINT: Updated f-string method (#6230)

* MAINT: Used f-string method

Updated the code with f-string methods wherever required for a better and cleaner understanding of the code.

* Updated files with f-string method

* Update rsa_key_generator.py

* Update rsa_key_generator.py

* Update elgamal_key_generator.py

* Update lru_cache.py

I don't think this change is efficient but it might tackle the error as the error was due to using long character lines.

* Update lru_cache.py

* Update lru_cache.py

Co-authored-by: cyai <seriesscar@gmail.com>
Co-authored-by: Christian Clauss <cclauss@me.com>

hashes/chaos_machine.py

@@ -96,7 +96,7 @@ if __name__ == "__main__":
 
     # Pulling Data (Output)
     while inp in ("e", "E"):
-        print("%s" % format(pull(), "#04x"))
+        print(f"{format(pull(), '#04x')}")
         print(buffer_space)
         print(params_space)
         inp = input("(e)exit? ").strip()