Traceback (most recent call last):


 "/usr/local/bin/mypy", line 6, in <module>

main(__file__)


 "/usr/local/lib/python3.6/site-packages/mypy/main.py", line 42, in main

res = type_check_only(sources, bin_dir, options)


 "/usr/local/lib/python3.6/site-packages/mypy/main.py", line 87, in type_check_only

options=options)


 "/usr/local/lib/python3.6/site-packages/mypy/build.py", line 183, in build

dispatch(sources, manager)


 "/usr/local/lib/python3.6/site-packages/mypy/build.py", line 1526, in dispatch

process_graph(graph, manager)


 "/usr/local/lib/python3.6/site-packages/mypy/build.py", line 1762, in process_graph

process_stale_scc(graph, scc)


 "/usr/local/lib/python3.6/site-packages/mypy/build.py", line 1841, in process_stale_scc

graph[id].type_check_first_pass()


 "/usr/local/lib/python3.6/site-packages/mypy/build.py", line 1451, in type_check_first_pass

self.type_checker.check_first_pass()


 "/usr/local/lib/python3.6/site-packages/mypy/checker.py", line 175, in check_first_pass

self.accept(d)


 "/usr/local/lib/python3.6/site-packages/mypy/checker.py", line 247, in accept

typ = node.accept(self)


 "/usr/local/lib/python3.6/site-packages/mypy/nodes.py", line 788, in accept

return visitor.visit_expression_stmt(self)


 "/usr/local/lib/python3.6/site-packages/mypy/checker.py", line 1596, in visit_expression_stmt

self.accept(s.expr)


 "/usr/local/lib/python3.6/site-packages/mypy/checker.py", line 247, in accept

typ = node.accept(self)


 "/usr/local/lib/python3.6/site-packages/mypy/nodes.py", line 1400, in accept

return visitor.visit_op_expr(self)


 "/usr/local/lib/python3.6/site-packages/mypy/checker.py", line 2160, in visit_op_expr

return self.expr_checker.visit_op_expr(e)


 "/usr/local/lib/python3.6/site-packages/mypy/checkexpr.py", line 1110, in visit_op_expr

return self.strfrm_checker.check_str_interpolation(e.left, e.right)


 "/usr/local/lib/python3.6/site-packages/mypy/checkstrformat.py", line 74, in check_str_interpolation

self.check_simple_str_interpolation(specifiers, replacements)


 "/usr/local/lib/python3.6/site-packages/mypy/checkstrformat.py", line 146, in check_simple_str_interpolation

check_node(rep_node)


 "/usr/local/lib/python3.6/site-packages/mypy/checkstrformat.py", line 255, in check_expr

check_type(type)


 "/usr/local/lib/python3.6/site-packages/mypy/checkstrformat.py", line 251, in check_type

'expression has type', 'placeholder has type')


 "/usr/local/lib/python3.6/site-packages/mypy/checker.py", line 2273, in check_subtype

if is_subtype(subtype, supertype):


 "/usr/local/lib/python3.6/site-packages/mypy/subtypes.py", line 54, in is_subtype

for item in right.items)


 "/usr/local/lib/python3.6/site-packages/mypy/subtypes.py", line 54, in <genexpr>

for item in right.items)


 "/usr/local/lib/python3.6/site-packages/mypy/subtypes.py", line 56, in is_subtype

return left.accept(SubtypeVisitor(right, type_parameter_checker,
AttributeError: 'NoneType' object has no attribute 'accept'

Traceback (most recent call last):


 "<string>", line 1, in <module>


 "C:\Anaconda3\lib\site-packages\ipyparallel\__init__.py", line 17, in <module>

from .serialize import *


 "C:\Anaconda3\lib\site-packages\ipyparallel\serialize\__init__.py", line5, in <module>

from .serialize import (


 "C:\Anaconda3\lib\site-packages\ipyparallel\serialize\serialize.py", line 26, in <module>

from jupyter_client.session import MAX_ITEMS, MAX_BYTES


 "C:\Anaconda3\lib\site-packages\jupyter_client\__init__.py", line 8, in <module>

from .blocking import BlockingKernelClient


 "C:\Anaconda3\lib\site-packages\jupyter_client\blocking\__init__.py", line 1, in <module>

from .client import BlockingKernelClient


 "C:\Anaconda3\lib\site-packages\jupyter_client\blocking\client.py", line72, in <module>

class BlockingKernelClient(KernelClient):


 "C:\Anaconda3\lib\site-packages\jupyter_client\blocking\client.py", line152, in BlockingKernelClient

execute = reqrep(KernelClient.execute)


 "C:\Anaconda3\lib\site-packages\jupyter_client\blocking\client.py", line49, in reqrep

basedoc, _ = meth.__doc__.split('Returns\n', 1)
AttributeError: 'NoneType' object has no attribute 'split'
