initial creation

py3interm/EXAMPLES/getenv_ex.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+import sys
+import os.path
+
+if sys.platform == 'win32':
+    user_key = 'USERNAME'
+else:
+    user_key = 'USER'
+
+count_key = 'COUNT'
+
+os.environ[count_key] = "42"  # <1>
+print("count is", os.environ[count_key], "user is", os.environ[user_key])  # <2>
+print("count is", os.environ.get(count_key), "user is", os.environ.get(user_key))  # <3>
+user = os.getenv(user_key)  # <4>
+count = os.getenv(count_key)
+print("count is", count, "user is", user)
+cmd = "count is ${} user is ${}".format(count_key, user_key)
+print("cmd:", cmd)
+print(os.path.expandvars(cmd))  # <5>