pandas import error

Description
What steps will reproduce the problem?
import pandas
Traceback (most recent call last):

File "", line 1, in
import pandas

File "C:\Users\tjash\Anaconda3\lib\site-packages\pandas_init_.py", line 54, in
from pandas.core.api import (

File "C:\Users\tjash\Anaconda3\lib\site-packages\pandas\core\api.py", line 29, in
from pandas.core.groupby import Grouper, NamedAgg

File "C:\Users\tjash\Anaconda3\lib\site-packages\pandas\core\groupby_init_.py", line 1, in
from pandas.core.groupby.generic import DataFrameGroupBy, NamedAgg, SeriesGroupBy

File "C:\Users\tjash\Anaconda3\lib\site-packages\pandas\core\groupby\generic.py", line 63, in
from pandas.core.groupby.groupby import (

File "C:\Users\tjash\Anaconda3\lib\site-packages\pandas\core\groupby\groupby.py", line 61, in
from pandas.core.groupby import base, ops

File "C:\Users\tjash\Anaconda3\lib\site-packages\pandas\core\groupby\ops.py", line 16, in
import pandas._libs.reduction as libreduction

File "pandas_libs\reduction.pyx", line 30, in init pandas._libs.reduction

AttributeError: type object 'pandas._libs.reduction.Reducer' has no attribute 'reduce_cython'

Versions
Spyder version: 4.0.1
Python version: 3.7.3
Qt version: 5.9.6
PyQt5 version: 5.9.2
Operating System: Windows 10
Dependencies
atomicwrites >=1.2.0         :  1.3.0 (OK)
chardet >=2.0.0              :  3.0.4 (OK)
cloudpickle >=0.5.0          :  1.3.0 (OK)
diff_match_patch >=20181111  :  20181111 (OK)
intervaltree                 :  None (OK)
IPython >=4.0                :  7.12.0 (OK)
jedi =0.14.1                 :  0.14.1 (OK)
nbconvert >=4.0              :  5.6.1 (OK)
numpydoc >=0.6.0             :  0.9.2 (OK)
pexpect >=4.4.0              :  4.8.0 (OK)
pickleshare >=0.4            :  0.7.5 (OK)
psutil >=0.3                 :  5.6.7 (OK)
pygments >=2.0               :  2.5.2 (OK)
pylint >=0.25                :  2.4.4 (OK)
pyls >=0.31.2;<0.32.0        :  0.31.7 (OK)
zmq >=17                     :  18.1.1 (OK)
qdarkstyle >=2.7             :  2.8 (OK)
qtawesome >=0.5.7            :  0.6.1 (OK)
qtconsole >=4.6.0            :  4.6.0 (OK)
qtpy >=1.5.0                 :  1.9.0 (OK)
rtree >=0.8.3                :  0.9.3 (OK)
sphinx >=0.6.6               :  2.4.0 (OK)
spyder_kernels >=1.8.1;<2.0.0:  1.8.1 (OK)
watchdog                     :  None (OK)
cython >=0.21                :  0.29.15 (OK)
matplotlib >=2.0.0           :  3.1.3 (OK)
numpy >=1.7                  :  1.18.1 (OK)
pandas >=0.13.1              :  1.0.1 (OK)
scipy >=0.17.0               :  1.4.1 (OK)
sympy >=0.7.3                :  1.5.1 (OK)