Refactor for more descriptive variable naming

Co-authored-by: NBartosz Zaczyński <bartosz.zaczynski@gmail.com>

python-web-applications/main.py

@@ -4,30 +4,30 @@ from flask import request
 app = Flask(__name__)
 
 
-def convert_temp(cel_temp):
-    """Converts Celsius temperature to Fahrenheit temperature."""
+def fahrenheit_from(celsius):
+    """Convert Celsius to Fahrenheit degrees."""
     try:
-        far_temp = float(cel_temp) * 9 / 5 + 32
-        far_temp = round(far_temp, 3)  # Round to three decimal places
-        return str(far_temp)
-    except ValueError:  # User entered non-numeric temperature
+        fahrenheit = float(celsius) * 9 / 5 + 32
+        fahrenheit = round(fahrenheit, 3)  # Round to three decimal places
+        return str(fahrenheit)
+    except ValueError:
         return "invalid input"
 
 
 @app.route("/")
 def index():
-    cel_temp = request.args.get("cel_temp")
-    if cel_temp:
-        far_temp = convert_temp(cel_temp)
+    celsius = request.args.get("celsius", "")
+    if celsius:
+        fahrenheit = fahrenheit_from(celsius)
     else:
-        far_temp = ""
+        fahrenheit = ""
     return (
-        """<form action="">
-                Celsius: <input type="text" name="cel_temp">
-                <input type="submit" value="Convert">
+        """<form action="" method="get">
+                Celsius temperature: <input type="text" name="celsius">
+                <input type="submit" value="Convert to Fahrenheit">
             </form>"""
         + "Fahrenheit: "
-        + far_temp
+        + fahrenheit
     )