removes checking truth value of an array with more than one element

SnShine · SnShine · commit 6404d1d9c987 · 2016-07-15T18:49:22.000+05:30
diff --git a/learning.py b/learning.py
@@ -84,8 +84,8 @@ def __init__(self, examples=None, attrs=None, attrnames=None, target=-1,
         else:
             self.examples = examples
         # Attrs are the indices of examples, unless otherwise stated.
-        if not attrs and self.examples:
-            attrs = list(range(len(self.examples[0])))
+        if attrs is None and self.examples is not None:
+                attrs = list(range(len(self.examples[0])))
         self.attrs = attrs
         # Initialize .attrnames from string, list, or by default
         if isinstance(attrnames, str):
