Clean up calculator example

Author: gjbex

source-code/command-line-arguments/Fire/calculations.py

@@ -0,0 +1,14 @@
+def add(x, y):
+    return x + y
+
+def sub(x, y):
+    return x - y
+
+def mult(x, y):
+    return x*y
+
+def div(x, y):
+    return x/y
+
+def mod(x, y):
+    return x % y

source-code/command-line-arguments/Fire/calculator.py

@@ -1,13 +1,7 @@
 #!/usr/bin/env python
 import fire
-
-
-def add(x, y):
-    return x + y
-
-def mult(x, y):
-    return x*y
+import calculations
 
 
 if __name__ == '__main__':
-    fire.Fire()
+    fire.Fire(calculations)