回答編集履歴

  ※ Pandas も使う場合。

  ```python

  import numpy as np

  import pandas as pd

  [141, 5.669293427934539213e+05]])

 

  df = pd.DataFrame(Dmrc)

  df[0] = df[0].astype(int)

  df[1] = df[1].map('{:.3e}'.format).replace(r'e([+-])0*', r'\1', regex=True)

  df[4] = 1

 

  np.savetxt("file.txt", df.values, fmt='%-8s%8d%8s%8d%8d%8d%8d')

  ```