Filter pandas DataFrame by substring critera

Question

I have a pandas DataFrame with a column of string values. I need to select rows based on partial string matches.

Something like this idiom:

re.search(pattern, cell_in_question)  

returning a boolean. I am familiar with the syntax of df[df['A'] == "hello world"] but can't seem to find a way to do the same with a partial string match, say 'hello'.

Answer 1

Based on github issue #620, it looks like you'll soon be able to do the following:

df[df['A'].str.contains("hello")] 

Update: vectorized string methods (i.e., Series.str) are available in pandas 0.8.1 and up.