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# List unique values in a DataFrame column
df['Column Name'].unique()
# To extract a specific column (subset the dataframe), you can use [ ] (brackets) or attribute notation.
df.height
df['height']
# are same thing!!! (from http://www.stephaniehicks.com/learnPython/pages/pandas.html
# -or-
# http://www.datacarpentry.org/python-ecology-lesson/02-index-slice-subset/)

Useful Pandas Snippets

A personal diary of DataFrame munging over the years.

Data Types and Conversion

Convert Series datatype to numeric (will error if column has non-numeric values)
(h/t @makmanalp)