Python文本分析

准备统计和机器学习的文本数据

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For column renaming and selection, we define a dictionary column_mapping where

each entry defines a mapping from the current column name to a new name. Col‐

umns mapped to

None and unmentioned columns are dropped. A dictionary is per‐

fect documentation for such a transformation and easy to reuse. This dictionary is

then used to select and rename the columns that we want to keep.

column_mapping = {

'id': 'id',

'subreddit': 'subreddit',

'title': 'title',

'selftext': 'text',

'category_1': 'category',

'category_2': 'subcategory',

'category_3': None, # no data

'in_data': None, # not needed

'reason_for_exclusion': None # not needed ...