python - Why does index cause typeerror in pandas dataframe groupby agg method? -


i'm building aggregate following code:

import numpy import pandas  orders = pandas.read_csv(     "orders.csv",     dtype={         "order_id": numpy.int32,         "user_id": numpy.int32,         "eval_set": "category",         "order_number": numpy.int8,         "order_dow": numpy.int8,         "order_hour_of_day": numpy.int8,         "days_since_prior_order": numpy.float64     } )  orders.set_index('order_id', inplace=true, drop=false)  prior_order_products = pandas.read_csv(     "order_products__prior.csv",     dtype={         "order_id": numpy.int32,         "product_id": numpy.int32,         "add_to_cart_order": numpy.int16,         "reordered": numpy.int8     } )  prior_order_products.set_index(['order_id', 'product_id'], inplace=true, drop=false)  prior_order_products = prior_order_products.join(orders, how="inner", on='order_id', rsuffix='_') prior_order_products.drop('order_id_', inplace=true, axis=1)  del orders  prior_order_products['user_product_id'] =\     100000 * prior_order_products["user_id"].astype(numpy.int64) + prior_order_products["product_id"]  user_products = prior_order_products.\     groupby('user_product_id', sort=false).\     agg({'order_id': ['size', 'last'], 'add_to_cart_order': 'sum'})

it gives following error:

traceback (most recent call last):   file "c:/users/strategy/pycharmprojects/test/main.py", line 52, in <module>     agg({'order_id': ['size', 'last'], 'add_to_cart_order': 'sum'})   ... typeerror: '<' not supported between instances of 'numpy.ndarray' , 'str'

i can error away if comment line

prior_order_products.set_index(['order_id', 'product_id'], inplace=true, drop=false)

also, can error away if limit number of rows read prior_order_products. file not malformed, no data missing or wrong format.

what error mean? how related index on prior_order_products? how related number of rows in prior_order_products?


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