importing pandas resulting an error
import pandas as pd
import dask.distributed as dd

The above code was working fine till afternoon IST and now, it has started throwing errors.
Perhaps, the version?

AttributeError: module 'pandas._libs.missing' has no attribute 'NAType'

>>> df_train = dd.read_csv(filename_train, blocksize = "60MB")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'dd' is not defined
>>> df_test = dd.read_csv(filename_test, blocksize = "60MB")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'dd' is not defined

>>> df_train = df_train.drop(columns = ['INTERVAL_ID'], axis=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'df_train' is not defined

version
pandas=1.0.2=py37h0573a6f_0