In role_teacher model, individual students can see their own comments but also teacher's ones, whereas individual students' comments cannot be seen by students.
def remove_extension(file_name):
"""
Remove 3 letters and 4 letters extension from filename
>>> remove_extension('my file.tex')
'my file'
>>> remove_extension('my file.html')
'my file'
>>> remove_extension('my file')
'my file'
"""
for point_loc in [3,4]:
if len(file_name)>point_loc and file_name[-point_loc-1] == '.':
return file_name[:-point_loc-1]
return file_name
if __name__ == "__main__":
import doctest
doctest.testmod()