Merge branch 'joshmerge' into develop

1 files changed, 11 insertions, 2 deletions

diff --git a/tablib/core.py b/tablib/core.py
index 730467f..a7a2963 100644
--- a/tablib/core.py
+++ b/tablib/core.py
@@ -173,10 +173,19 @@ class Dataset(object):
 
 	def append(self, row=None, col=None):
 		"""Adds a row to the end of Dataset"""
-		if row:
+		if row is not None:
 			self._validate(row)
 			self._data.append(tuple(row))
-		elif col:
+		elif col is not None:
+			col = list(col)
+			if self.headers:
+				header = [col.pop(0)]
+			else:
+				header = []
+			if len(col) == 1 and callable(col[0]):
+				col = map(col[0], self._data)
+			col = tuple(header + col)
+				
 			self._validate(col=col)
 
 			if self.headers: