code: def check_known_inconsistencies(bill_data, bond_data):
      """
      There are a couple quirks in the data provided by Bank of Canada.
      Check that no new quirks have been introduced in the latest download.
      """
      inconsistent_dates = bill_data.index.sym_diff(bond_data.index)
      known_inconsistencies = [
          # bill_data has an entry for 2010-02-15, which bond_data doesn't.
          # bond_data has an entry for 2006-09-04, which bill_data doesn't.
          # Both of these dates are bank holidays (Flag Day and Labor Day,
          # respectively).
          pd.Timestamp("2006-09-04", tz="UTC"),
          pd.Timestamp("2010-02-15", tz="UTC"),
          # 2013-07-25 comes back as "Not available" from the bills endpoint.
          # This date doesn't seem to be a bank holiday, but the previous
          # calendar implementation dropped this entry, so we drop it as well.
          # If someone cares deeply about the integrity of the Canadian trading
          # calendar, they may want to consider forward-filling here rather than
          # dropping the row.
          pd.Timestamp("2013-07-25", tz="UTC"),
      ]
      unexpected_inconsistences = inconsistent_dates.drop(
          known_inconsistencies
      )
      if len(unexpected_inconsistences):
          in_bills = bill_data.index.difference(
              bond_data.index
          ).difference(known_inconsistencies)
          in_bonds = bond_data.index.difference(
              bill_data.index
          ).difference(known_inconsistencies)
          raise ValueError(
              "Inconsistent dates for Canadian treasury bills vs bonds. \n"
              "Dates with bills but not bonds: {in_bills}.\n"
              "Dates with bonds but not bills: {in_bonds}.".format(
                  in_bills=in_bills,
                  in_bonds=in_bonds,
              )
          )
  
file_path: catalyst/catalyst/data/treasuries_can.py
imports: import pandas
  import six
  from toolz import curry
  from toolz.curried.operator import add
label_desc: Use image node_id 3 for calling a global function with example usage: check_known_inconsistencies(bill_data, bond_data) without return types