gistfile1.txt

>>> type(reader)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'reader' is not defined
>>> with open('hr_data.csv.csv', 'rU') as infile:
...     reader = list(csv.DictReader(infile, delimiter=','))
... 
>>> type(reader)
<class 'list'>