code: def create_txn(asset, price, amount, datetime, order_id):
      return Transaction(
          asset=asset,
          price=price,
          amount=amount,
          dt=datetime,
          order_id=order_id,
      )
  
imports: import pandas
  import numpy
  from datetime import timedelta, datetime
  from catalyst.assets import Asset
  from catalyst.finance.transaction import Transaction
  from catalyst.protocol import Event, DATASOURCE_TYPE
  from catalyst.sources import SpecificEquityTrades
  from catalyst.finance.trading import SimulationParameters
  from catalyst.sources.test_source import create_trade
  from catalyst.data.loader import load_from_yahoo, load_bars_from_yahoo
  from catalyst.utils.calendars import get_calendar
  from catalyst.utils.input_validation import expect_types
label_desc: Use image node_id 7 for calling a global function with example usage: create_txn(asset, price, amount, datetime, order_id) and returns: Transaction