I get a ValueError: not enough values to unpack (expected 1, got 0) exception when I'm trying to run jedi inside of AWS Lambda powered with my S3-based Python importer. I manged to make parso and jedi working with two small Python standard compliant patches, but with this one I feel clueless. Here is the stack trace, debug output and the test function code. It works locally. Any ideas where to look at would be highly appreciated. The ultimate goal is to explore possibilities of having a completely serverless Python IDE.
1. Debug output and Stack trace:
dbg: Start: infer
dbg: infer_node <Name: variable@16,4>@(16, 4) in MixedModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: context.goto <Name: variable@16,4> in (MixedModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)): [<TreeNameDefinition: string_name=variable start_pos=(15, 4)>]
dbg: global search_module 'builtins': <CompiledModule: <module 'builtins' (built-in)>>
dbg: infer_node PythonNode(atom, [<Operator: [>, PythonNode(testlist_comp, [<Name: keyword@15,17>, <Operator: ,>, <Name: f@15,26>, <Operator: ,>, <Name: C@15,29>, <Operator: ,>, <Name: x@15,32>]), <Operator: ]>])@(15, 16) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: iterate <SequenceLiteralValue of PythonNode(atom, [<Operator: [>, PythonNode(testlist_comp, [<Name: keyword@15,17>, <Operator: ,>, <Name: f@15,26>, <Operator: ,>, <Name: C@15,29>, <Operator: ,>, <Name: x@15,32>]), <Operator: ]>])>
dbg: infer_node <Name: keyword@15,17>@(15, 17) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: context.goto <Name: keyword@15,17> in (ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)): [<TreeNameDefinition: string_name=keyword start_pos=(2, 7)>]
dbg: global search_module 'keyword': <ModuleValue: keyword@3-95 is_stub=False>
dbg: after import: S{<ModuleValue: keyword@3-95 is_stub=False>}
dbg: context.names_to_types: [<TreeNameDefinition: string_name=keyword start_pos=(2, 7)>] -> S{<ModuleValue: keyword@3-95 is_stub=False>}
dbg: infer_node <Name: f@15,26>@(15, 26) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: context.goto <Name: f@15,26> in (ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)): [<TreeNameDefinition: string_name=f start_pos=(12, 4)>]
dbg: context.names_to_types: [<TreeNameDefinition: string_name=f start_pos=(12, 4)>] -> S{<FunctionValue: <Function: f@12-14>>}
dbg: infer_node <Name: C@15,29>@(15, 29) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: context.goto <Name: C@15,29> in (ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)): [<TreeNameDefinition: string_name=C start_pos=(4, 6)>]
dbg: context.names_to_types: [<TreeNameDefinition: string_name=C start_pos=(4, 6)>] -> S{<ClassValue: <Class: C@4-6>>}
dbg: infer_node <Name: x@15,32>@(15, 32) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: context.goto <Name: x@15,32> in (ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)): [<TreeNameDefinition: string_name=x start_pos=(10, 0)>]
dbg: infer_expr_stmt <ExprStmt: x = D()@10,0> (<Name: x@10,0>)
dbg: infer_node PythonNode(atom_expr, [<Name: D@10,4>, PythonNode(trailer, [<Operator: (>, <Operator: )>])])@(10, 4) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: infer_node <Name: D@10,4>@(10, 4) in ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)
dbg: context.goto <Name: D@10,4> in (ModuleContext(<ModuleValue: __main__@2-16 is_stub=False>)): [<TreeNameDefinition: string_name=D start_pos=(7, 6)>]
dbg: context.names_to_types: [<TreeNameDefinition: string_name=D start_pos=(7, 6)>] -> S{<ClassValue: <Class: D@7-9>>}
dbg: infer_trailer: PythonNode(trailer, [<Operator: (>, <Operator: )>]) in S{<ClassValue: <Class: D@7-9>>}
dbg: execute: <ClassValue: <Class: D@7-9>> <TreeArguments: None>
dbg: context.goto 'object' in (<CompiledModule: <module 'builtins' (built-in)>>): [<CompiledName: (<CompiledValueName: string_name=builtins>).object>]
dbg: context.names_to_types: [<CompiledName: (<CompiledValueName: string_name=builtins>).object>] -> S{<CompiledValue: <class 'object'>>}
dbg: execute result: S{<TreeInstance of <ClassValue: <Class: D@7-9>>(<TreeArguments: None>)>} in <ClassValue: <Class: D@7-9>>
dbg: infer_expr_stmt result S{<TreeInstance of <ClassValue: <Class: D@7-9>>(<TreeArguments: None>)>}
dbg: context.names_to_types: [<TreeNameDefinition: string_name=x start_pos=(10, 0)>] -> S{<TreeInstance of <ClassValue: <Class: D@7-9>>(<TreeArguments: None>)>}
dbg: Dynamic array search for <SequenceLiteralValue of PythonNode(atom, [<Operator: [>, PythonNode(testlist_comp, [<Name: keyword@15,17>, <Operator: ,>, <Name: f@15,26>, <Operator: ,>, <Name: C@15,29>, <Operator: ,>, <Name: x@15,32>]), <Operator: ]>])>
dbg: Start: Resolve lazy value wrapper
dbg: iterate <SequenceLiteralValue of PythonNode(atom, [<Operator: [>, PythonNode(testlist_comp, [<Name: keyword@15,17>, <Operator: ,>, <Name: f@15,26>, <Operator: ,>, <Name: C@15,29>, <Operator: ,>, <Name: x@15,32>]), <Operator: ]>])>
dbg: global search_module 'types': <ModuleValue: types@1-267 is_stub=False>
Module: S{<ModuleValue: types@1-267 is_stub=False>}
dbg: context.goto 'FunctionType' in (<ModuleValue: types@1-267 is_stub=False>): [<TreeNameDefinition: string_name=FunctionType start_pos=(12, 0)>]
dbg: infer_expr_stmt <ExprStmt: FunctionType = type(_f)@12,0> (<Name: FunctionType@12,0>)
dbg: infer_node PythonNode(atom_expr, [<Name: type@12,15>, PythonNode(trailer, [<Operator: (>, <Name: _f@12,20>, <Operator: )>])])@(12, 15) in ModuleContext(<ModuleValue: types@1-267 is_stub=False>)
dbg: infer_node <Name: type@12,15>@(12, 15) in ModuleContext(<ModuleValue: types@1-267 is_stub=False>)
dbg: context.goto <Name: type@12,15> in (ModuleContext(<ModuleValue: types@1-267 is_stub=False>)): [<CompiledName: (<CompiledValueName: string_name=builtins>).type>]
dbg: context.names_to_types: [<CompiledName: (<CompiledValueName: string_name=builtins>).type>] -> S{<CompiledValue: <class 'type'>>}
dbg: infer_trailer: PythonNode(trailer, [<Operator: (>, <Name: _f@12,20>, <Operator: )>]) in S{<CompiledValue: <class 'type'>>}
dbg: infer_node <Name: _f@12,20>@(12, 20) in ModuleContext(<ModuleValue: types@1-267 is_stub=False>)
dbg: context.goto <Name: _f@12,20> in (ModuleContext(<ModuleValue: types@1-267 is_stub=False>)): [<TreeNameDefinition: string_name=_f start_pos=(11, 4)>]
dbg: context.names_to_types: [<TreeNameDefinition: string_name=_f start_pos=(11, 4)>] -> S{<FunctionValue: <Function: _f@11-12>>}
dbg: builtin start <CompiledValue: <class 'type'>>
Module: S{<ModuleValue: types@1-267 is_stub=False>}
dbg: context.goto 'FunctionType' in (<ModuleValue: types@1-267 is_stub=False>): [<TreeNameDefinition: string_name=FunctionType start_pos=(12, 0)>]
warning: catched stmt recursion: <ExprStmt: FunctionType = type(_f)@12,0> @(12, 0)
dbg: context.names_to_types: [<TreeNameDefinition: string_name=FunctionType start_pos=(12, 0)>] -> S{}
Name: S{}
dbg: End: Resolve lazy value wrapper
dbg: End: infer
not enough values to unpack (expected 1, got 0): ValueError
Traceback (most recent call last):
File "/var/task/index.py", line 17, in handle_event
return _test_infer_type()
File "./service/python/_test_infer_type.py", line 34, in _test_infer_type
File "/tmp/tmp9_1lc7fp/lib/python/jedi/api/helpers.py", line 482, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/api/__init__.py", line 311, in infer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/api/__init__.py", line 331, in _infer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/api/helpers.py", line 164, in infer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/__init__.py", line 179, in infer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/helpers.py", line 80, in infer_call_of_leaf
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/context.py", line 222, in infer_node
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 156, in infer_node
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 169, in _infer_node_if_inferred
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/cache.py", line 44, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 174, in _infer_node_cached
File "/tmp/tmp9_1lc7fp/lib/python/jedi/debug.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 184, in _infer_node
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 309, in infer_atom
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/context.py", line 75, in py__getattribute__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 414, in from_sets
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/context.py", line 75, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/names.py", line 282, in infer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/__init__.py", line 21, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/stdlib.py", line 844, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 741, in tree_name_to_values
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 298, in iterate_values
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 414, in from_sets
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 297, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 466, in iterate
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/iterable.py", line 361, in py__iter__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/dynamic_arrays.py", line 40, in check_array_additions
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/cache.py", line 44, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/debug.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/dynamic_arrays.py", line 76, in _internal_check_array_additions
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/iterable.py", line 190, in name
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/compiled/value.py", line 423, in __init__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 320, in __getattr__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/utils.py", line 75, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/cache.py", line 111, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 328, in _wrapped_value
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/iterable.py", line 205, in _get_wrapped_value
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/cache.py", line 44, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/iterable.py", line 197, in _cached_generics
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/iterable.py", line 338, in _get_generics
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/iterable.py", line 193, in _get_generics
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 461, in py__class__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 398, in __init__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 461, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/function.py", line 164, in py__class__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/helpers.py", line 198, in values_from_qualified_names
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 481, in py__getattribute__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 414, in from_sets
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 481, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 81, in py__getattribute__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 414, in from_sets
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 81, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/names.py", line 282, in infer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/__init__.py", line 21, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/stdlib.py", line 844, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 746, in tree_name_to_values
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 384, in infer_expr_stmt
File "/tmp/tmp9_1lc7fp/lib/python/jedi/debug.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 417, in _infer_expr_stmt
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/context.py", line 222, in infer_node
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 156, in infer_node
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 169, in _infer_node_if_inferred
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/cache.py", line 44, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 174, in _infer_node_cached
File "/tmp/tmp9_1lc7fp/lib/python/jedi/debug.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 82, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 208, in _infer_node
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/syntax_tree.py", line 280, in infer_trailer
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 472, in execute
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 414, in from_sets
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 472, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/__init__.py", line 21, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/stdlib.py", line 131, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/stdlib.py", line 173, in wrapper
File "/tmp/tmp9_1lc7fp/lib/python/jedi/plugins/stdlib.py", line 219, in builtins_type
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 461, in py__class__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 398, in __init__
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/base_value.py", line 461, in <genexpr>
File "/tmp/tmp9_1lc7fp/lib/python/jedi/inference/value/function.py", line 164, in py__class__
ValueError: not enough values to unpack (expected 1, got 0)
2. Test Function Code:
from jedi import settings, Interpreter, debug
settings.cache_directory = '/tmp'
debug.debug_function = debug.print_to_stdout
debug.enable_warning = True
debug.enable_notice = True
namespaces = [locals()]
source_1 = '''
import keyword
class C:
pass
class D:
pass
x = D()
def f():
pass
for variable in [keyword, f, C, x]:
variable'''
source_2 = '''
import json
json.lo'''
def _test_infer_type():
'''test type inference'''
script = Interpreter(source_1, namespaces)
defs = sorted(script.infer(), key=lambda d: d.line)
types = [str(d.type) for d in defs]
assert(['module', 'class', 'instance', 'function'] == types)
return 'OK'