Simplest way to locate a string in a column and get the value on the same row in another column

[David Shi via Python-list]

 What is the simplest way to locate a string in a column and get the value on 
the same row in another column ?
1  a2  b3  c
Locate b and obtain 2 in a table.
Looking forward to hearing from you.
Regards.
David

  
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