Module 'netCDF4' has no 'Dataset' member

Question

Recently I'm trying to study about netCDF4 in Python to deal with climate na data file, however, weather I tried import netCDF4 as nc or from netCDF4 import Dataframe, it just can't read the nc file I was trying to open, also the problem said module 'netCDF4' has no 'Dataset' member, and no name 'Dataset' in module 'netCDF4', I pip install netCDF4 before, so don't know how to solve this problem.

The code is below:

import netCDF4 as nc 
from netCDF4 import Dataset



file = 'D:/ncllll/wrfout_d04_2020-03-26_00_00_00.nc'
f = nc.Dataset(file)
print(f.variables)

all_vars = f.variables.keys()  
print(len(all_vars))  #

all_vars_info = f.variables.items()  
print(type(all_vars_info))   
print(len(all_vars_info))   #
all_vars_info = list(all_vars_info)  

And the problems are:

1. module 'netCDF4' has no 'Dataset' member
2. no name 'Dataset' in module 'netCDF4'

The print result is:

{}
0
<class 'dict_items'>
0