Data commit

Task/Undefined-values/Python/undefined-values.py

@@ -0,0 +1,28 @@
+# Check to see whether a name is defined
+try: name
+except NameError: print "name is undefined at first check"
+
+# Create a name, giving it a string value
+name = "Chocolate"
+
+# Check to see whether the name is defined now.
+try: name
+except NameError: print "name is undefined at second check"
+
+# Remove the definition of the name.
+del name
+
+# Check to see whether it is defined after the explicit removal.
+try: name
+except NameError: print "name is undefined at third check"
+
+# Recreate the name, giving it a value of 42
+name = 42
+
+# Check to see whether the name is defined now.
+try: name
+except NameError: print "name is undefined at fourth check"
+
+# Because most of the output is conditional, this serves as
+# a clear indicator that the program has run to completion.
+print "Done"