code: def load_prices_from_csv(filepath, identifier_col, tz="UTC"):
      data = pd.read_csv(filepath, index_col=identifier_col)
      data.index = pd.DatetimeIndex(data.index, tz=tz)
      data.sort_index(inplace=True)
      return data
  
imports: import os
  import pandas
label_desc: Use image node_id 1 for calling a global function with example usage: load_prices_from_csv(filepath, identifier_col, tz) and returns: data