adds envvar

Author: David Erb

src/dls_utilpack/envvar.py

@@ -0,0 +1,27 @@
+import os
+
+
+class Envvar:
+    """Class which covers environment variables, with default values."""
+
+    def __init__(self, name, **kwargs):
+
+        environ = kwargs.get("environ")
+
+        if environ is None:
+            environ = os.environ
+
+        self.name = name
+        self.is_set = False
+        self.value = None
+
+        if name in environ:
+            self.is_set = True
+            self.value = environ[name]
+        else:
+            if "default" in kwargs:
+                self.is_set = True
+                self.value = kwargs["default"]
+            else:
+                self.is_set = False
+                self.value = None