Unable to visualise NetCDF DEM using basemap in jupyter - jupyter

Question

I am trying to visualise the DEM tiles which are in a netCDF format using python, but the following code is resulting in just the country boundaries and grids and not any data plotted.
from netCDF4 import Dataset
import netCDF4
import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap
nc = 'C:/Users/S05E135.SRTMGL1_NC.nc'
fh = Dataset(nc, mode='r')
fh.variables.keys()
lons = fh.variables['lon'][:]
lats = fh.variables['lat'][:]
height= fh.variables['SRTMGL1_DEM'][:]
height_units = fh.variables['SRTMGL1_DEM'].units
fh.close()
# Plotting the data
# Get some parameters for the Stereographic Projection
lon_0 = lons.mean()
lat_0 = lats.mean()
m = Basemap(width=4000000,height=3500000,
resolution='l',projection='stere',\
lat_ts=40,lat_0=lat_0,lon_0=lon_0)
# use meshgrid to create 2D arrays
lon, lat = np.meshgrid(lons, lats)
xi, yi = m(lon, lat)
# Plot Data
cs = m.pcolor(xi,yi,np.squeeze(height))
# Add Grid Lines
m.drawparallels(np.arange(-80., 81., 10.), labels=[1,0,0,0], fontsize=10)
m.drawmeridians(np.arange(-180., 181., 10.), labels=[0,0,0,1], fontsize=10)
# Add Coastlines, States, and Country Boundaries
m.drawcoastlines()
m.drawstates()
m.drawcountries()
# Add Colorbar
cbar = m.colorbar(cs, location='bottom', pad="10%")
cbar.set_label(height_units)
# Add Title
plt.title('dem')
plt.show()
Image of the output coming from the code