input: Write a python function to load a numpy array from a file and create a pandas DataFrame from it.
  assert type(load_and_create_df('data.npy')) == pd.DataFrame
  assert not load_and_create_df('data.npy').empty
output: def load_and_create_df(file_path):
      import numpy as np
      import pandas as pd
      
      data = np.load(file_path)
      df = pd.DataFrame(data)
      return df