Label vs. number

Author: smurfix

asyncgpio/__init__.py

@@ -6,7 +6,7 @@
 from .libgpiod import *  # noqa
 
 
-def open_chip(num=0, consumer=sys.argv[0]):
+def open_chip(num=None, label=None, consumer=sys.argv[0]):
     """Returns an object representing a GPIO chip.
 
     Arguments:
@@ -18,4 +18,4 @@ def open_chip(num=0, consumer=sys.argv[0]):
     Returns:
         a :class:`asyncgpio.gpio.Chip` instance.
     """
-    return Chip(num, consumer=consumer)
+    return Chip(num=num, label=label, consumer=consumer)

asyncgpio/gpio.py

@@ -20,9 +20,11 @@ class Chip:
     """
     _chip = None
 
-    def __init__(self, num=0, label=None, consumer=sys.argv[0]):
+    def __init__(self, num=None, label=None, consumer=sys.argv[0]):
         self._num = num
         self._label = label
+        if (num is None) == (label is None):
+            raise ValueError("Specify either label or num")
         self._consumer = consumer
 
     def __repr__(self):