[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': 'Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:subdf = wholedf\nlocchurchdf = subdf[(subdf[\'Location\'] == "church st")]\nlocmaindf = subdf[(subdf[\'Location\'] == "main st")]\nloccolchdf = subdf[(subdf[\'Location\'] == "colchester av")]\nlocpearldf = subdf[(subdf[\'Location\'] == "pearl st")]\nlocnorthavdf = subdf[(subdf[\'Location\'] == "north av")]\nloccollegedf = subdf[(subdf[\'Location\'] == "college st")]\nlocnwindf = subdf[(subdf[\'Location\'] == "n winooski av")]\nlocswindf = subdf[(subdf[\'Location\'] == "s winooski av")]\nlocshelbdf = subdf[(subdf[\'Location\'] == "shelburne rd")]\nlocnorthstdf = subdf[(subdf[\'Location\'] == "north st")]\nlocpinestdf = subdf[(subdf[\'Location\'] == "pine st")]\nlocstpauldf = subdf[(subdf[\'Location\'] == "st paul st")]\nlocriversidedf = subdf[(subdf[\'Location\'] == "riverside av")]\nlocsprospectdf = subdf[(subdf[\'Location\'] == "s prospect st")]'}, {'role': 'assistant', 'content': 'data_preprocessing'}]