[Solved] ‘NoneType’ object has no attribute ‘fileno’

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from datetime import datetime

plt.style.use('ggplot')
columns = ['user_id','order_dt','order_products','order_amount']
df = pd.read_csv('CDNOW_master.txt',names = columns,sep = 's+')
df['order_date'] = pd.to_datetime(df.order_dt,format='%Y%m%d')
df['month'] = df.order_date.values.astype('datetime64[M]')
f = df.groupby('user_id')['month'].min().value_counts()
print(f)

Above is my code,my purpose is to get the value_counts of the users purchased in their first month, but only got the result of ‘NoneType’ object has no attribute ‘fileno’.

any ideas? much appreciate

here are the traceback

Traceback (most recent call last):
  File "C:UsersAdministratorDesktoppracticeCDNOW.py", line 19, in <module>
    print(f)
  File "C:UsersAdministratorAppDataLocalProgramsPythonPython35libsite-packagespandascorebase.py", line 51, in __str__
    return self.__unicode__()
  File "C:UsersAdministratorAppDataLocalProgramsPythonPython35libsite-packagespandascoreseries.py", line 982, in __unicode__
    width, height = get_terminal_size()
  File "C:UsersAdministratorAppDataLocalProgramsPythonPython35libsite-packagespandasioformatsterminal.py", line 33, in get_terminal_size
    return shutil.get_terminal_size()
  File "C:UsersAdministratorAppDataLocalProgramsPythonPython35libshutil.py", line 1071, in get_terminal_size
    size = os.get_terminal_size(sys.__stdout__.fileno())
AttributeError: 'NoneType' object has no attribute 'fileno'