Refactor currency_converter.py (TheAlgorithms#5917)

* Update currency_converter.py

* refactor: add types and remove reserved  keyword "from" usage

* feat: update text

* Update web_programming/currency_converter.py

Co-authored-by: xcodz-dot <[email protected]>

* Update web_programming/currency_converter.py

Co-authored-by: xcodz-dot <[email protected]>

* fix: update currency_converter.py

* updating DIRECTORY.md

* Update currency_converter.py

Co-authored-by: xcodz-dot <[email protected]>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>

Author: 4 people

Diff for: web_programming/currency_converter.py

@@ -10,9 +10,11 @@
 URL_BASE = "https://www.amdoren.com/api/currency.php"
 TESTING = os.getenv("CI", False)
 API_KEY = os.getenv("AMDOREN_API_KEY", "")
-if not API_KEY and not TESTING:
-    raise KeyError("Please put your API key in an environment variable.")
 
+if not API_KEY and not TESTING:
+    raise KeyError(
+        "API key must be provided in the 'AMDOREN_API_KEY' environment variable."
+    )
 
 # Currency and their description
 list_of_currencies = """