ModuleNotFoundError: No module named 'pyproj'

[manees12]

When solving [Ex5-Mapping-Curie-depth-EMAG2.ipynb] through Binder, at the interpolation onto grid projection step, I got this error:

ModuleNotFoundError Traceback (most recent call last)
in
7
8 # extent on the sphere (WGS84)
----> 9 extent_sphere = mapping.convert_extent(extent_grid, epsg_in=2157, epsg_out=4326)
10
11 # map extent - should be narrower than extent_sphere

/usr/lib/python3.6/site-packages/pycurious/mapping.py in convert_extent(extent_in, epsg_in, epsg_out)
103 xi = [xmin, xmin, xmax, xmax]
104 yi = [ymin, ymax, ymin, ymax]
--> 105 xo, yo = transform_coordinates(xi, yi, epsg_in, epsg_out)
106 extent_out = [min(xo), max(xo), min(yo), max(yo)]
107 return extent_out

/usr/lib/python3.6/site-packages/pycurious/mapping.py in transform_coordinates(x, y, epsg_in, epsg_out)
77 y coordinates projected in epsg_out
78 """
---> 79 import pyproj
80
81 proj_in = pyproj.Proj("+init=EPSG:" + str(epsg_in))

ModuleNotFoundError: No module named 'pyproj'

Could you please debug this?