circle_area.py

In a computer program a value is assigned to a name.
The value can change,
but the name stays the same.
When I'm buying food at the grocery store, when I check out I'll see "total $".
That's how much money I owe the grocery store. It changes every time I buy food
there. (If it's the exact same amount as before, then it'll have a different timestamp).
 Every customer in the grocery store sees the same name: total $ when they check out, too.
 Each customer is responsible for their own purchases, and therefore, their own total $.
When using variables (names), the computer program can be run a million times
by a million different people, with the results (or transaction) corresponding
to the person conducting the transaction.

greetings.py

@@ -2,6 +2,6 @@
 # ------------
 # By MWC contributors
 
-my_name ="Chris"
+my_name = input("What is your name? ")
 greeting = "Hello, " + my_name
 print(greeting)