So I went through Jack S.Hale’s post and I assumed probably H( d ) and H( c ) are not implemented yet.
It would be great if someone give me a hint on this case.
And if they are not implemented, Is there any other option to implement quad/hex meshes for H( c ) and H( d ).
The only immediate way I know of would be to use the isogeometric H^1, H(\operatorname{curl}), and H(\operatorname{div}) spline spaces (which are defined on structured quad/hex meshes). These are supported through a library I wrote, tIGAr, although the very lowest-order case corresponding to classical finite elements would not work, and usage of tIGAr is somewhat different from standard FEniCS.
I don’t use Anaconda myself and haven’t seen this error before. However, just Googling the first part of the error, it looks like maybe you’re running a script as an executable (i.e., ./scriptname.py in a Bash shell, instead of python3 scriptname.py) without including #!/usr/bin/env python3 at the top of the script. (See, e.g., this StackOverflow thread.)