socketserver.py error when using with paste

[dvarrel]

hello, bravo for bottlepy, it's really understandable for my students.

i try to use it with paste, but socketserver.py handled type error when i use template values : TypeError: a bytes-like object is required, not 'str'

the entire error

Traceback (most recent call last):
----------------------------------------
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 1085, in process_request_in_thread
    self.finish_request(request, client_address)
Exception happened during processing of request from ('127.0.0.1', 49242)
  File "/usr/lib/python3.6/socketserver.py", line 364, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python3.6/socketserver.py", line 724, in __init__
    self.handle()
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 459, in handle
    BaseHTTPRequestHandler.handle(self)
Traceback (most recent call last):
  File "/usr/lib/python3.6/http/server.py", line 418, in handle
    self.handle_one_request()
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 1085, in process_request_in_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 454, in handle_one_request
    self.wsgi_execute()
  File "/usr/lib/python3.6/socketserver.py", line 364, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 309, in wsgi_execute
    self.wsgi_write_chunk('')
  File "/usr/lib/python3.6/socketserver.py", line 724, in __init__
    self.handle()
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 167, in wsgi_write_chunk
    self.wfile.write(chunk)
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 459, in handle
    BaseHTTPRequestHandler.handle(self)
  File "/usr/lib/python3.6/http/server.py", line 418, in handle
    self.handle_one_request()
  File "/usr/lib/python3.6/socketserver.py", line 803, in write
    self._sock.sendall(b)
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 454, in handle_one_request
    self.wsgi_execute()
TypeError: a bytes-like object is required, not 'str'
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 309, in wsgi_execute
    self.wsgi_write_chunk('')
----------------------------------------
  File "/usr/lib/python3/dist-packages/paste/httpserver.py", line 167, in wsgi_write_chunk
    self.wfile.write(chunk)
  File "/usr/lib/python3.6/socketserver.py", line 803, in write
    self._sock.sendall(b)
TypeError: a bytes-like object is required, not 'str' ```