Does column header exist?

[dglmoore]

Description

When iteratively generating data, it would be useful to be able to determine if a column header exists in the library.

At present, the only solution is something like

if 'header_name' in dex.headers():
    pass
else:
    pass

Proposed Resolution

Create a method that queries the database for column header names, e.g.

def header_exists(header_name):
    pass