Django query filter with variable column

Almost there..

members.filter(**{'string__contains': 'search_string'})

To understand what it's doing, google around : ) Understanding kwargs in Python

** expands dictionary key/value pairs to keyword argument - value pairs.

To adapt your example to the solution:

variable_column = 'name'
search_type = 'contains'
filter = variable_column + '__' + search_type
info=members.filter(**{ filter: search_string })