Update app.py

app.py

@@ -11,8 +11,8 @@ def string_to_int(size_str: str):
         size = float(size)
     except ValueError:
         raise ValidationException("The numbers cannot be converted into a float")
-    if suffix not in list[mappings.keys()] and (int(suffix)<48 or int(suffix)>57) :
-        raise ValidationException(f"The suffix is not valid. It can only be one of {list[mappings.keys()]}")
+    if suffix not in list(mappings.keys()) and (int(suffix)<48 or int(suffix)>57) :
+        raise ValidationException(f"The suffix is not valid. It can only be one of {list(mappings.keys())}")
     return size * mappings[suffix]
 
 def int_to_string(size: int, precision=2):