AttributeError: 'TupleType' object has no attribute 'type'

[ZeeD]

I'm using the latest git version.
I'm toying with mypy and a .py of my project. I get this stacktrace:

$ mypy --verbose  _pdftojson.py 
Traceback (most recent call last):
File "/usr/bin/mypy", line 6, in <module>
    main(__file__)
File "/usr/lib64/python3.5/site-packages/mypy/main.py", line 49, in main
    type_check_only(sources, bin_dir, options)
File "/usr/lib64/python3.5/site-packages/mypy/main.py", line 92, in type_check_only
    python_path=options.python_path)
File "/usr/lib64/python3.5/site-packages/mypy/build.py", line 196, in build
    result = manager.process(initial_states)
File "/usr/lib64/python3.5/site-packages/mypy/build.py", line 378, in process
    next.process()
File "/usr/lib64/python3.5/site-packages/mypy/build.py", line 832, in process
    self.type_checker().visit_file(self.tree, self.tree.path)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 371, in visit_file
    self.accept(d)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 370, in accept
    return visitor.visit_func_def(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 431, in visit_func_def
    self.check_func_item(defn, name=defn.name())
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 464, in check_func_item
    self.check_func_def(defn, typ, name)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 545, in check_func_def
    self.accept_in_frame(item.body)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 391, in accept_in_frame
    answer = self.accept(node, type_context)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 514, in accept
    return visitor.visit_block(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 939, in visit_block
    self.accept(s)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 602, in accept
    return visitor.visit_for_stmt(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 1630, in visit_for_stmt
    item_type = self.analyze_iterable_item_type(s.expr)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 1642, in analyze_iterable_item_type
    iterable = self.accept(expr)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 974, in accept
    return visitor.visit_call_expr(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 1741, in visit_call_expr
    return self.expr_checker.visit_call_expr(e)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 118, in visit_call_expr
    return self.check_call_expr_with_callee_type(callee_type, e)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 128, in check_call_expr_with_callee_type
    e.arg_names, callable_node=e.callee)[0]
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 189, in check_call
    arg_types = self.infer_arg_types_in_context(None, args)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 236, in infer_arg_types_in_context
    arg_type = self.accept(arg, ctx)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 1320, in accept
    return self.chk.accept(node, context)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 930, in accept
    return visitor.visit_member_expr(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 1767, in visit_member_expr
    return self.expr_checker.visit_member_expr(e)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 680, in visit_member_expr
    result = self.analyze_ordinary_member_access(e, False)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 693, in analyze_ordinary_member_access
    self.named_type, self.msg)
File "/usr/lib64/python3.5/site-packages/mypy/checkmember.py", line 84, in analyze_member_access
    result = analyze_class_attribute_access(itype, name, node, is_lvalue, builtin_type, msg)
File "/usr/lib64/python3.5/site-packages/mypy/checkmember.py", line 212, in analyze_class_attribute_access
    node = itype.type.get(name)
AttributeError: 'TupleType' object has no attribute 'type'

[refi64]

What file triggered this, i.e. what's your Python code?

[JukkaL]

Yeah, it would be useful if you could isolate a small Python fragment that generates the stack trace. It's not obvious from the stack trace what caused this. This happened in a for statement -- I wonder if this bit of information makes it easier to isolate the cause.

[ZeeD]

sorry for the delay. I did some tests to minimize the code. From what I can understand, the problem is with the namedtuple "_fields" attribute

import collections
MyNamedTuple = collections.namedtuple('MyNamedTuple', ['spam', 'eggs'])
MyNamedTuple._fields

mypy tells me

$ mypy stacktrace_mypy.py     
Traceback (most recent call last):
File "/usr/bin/mypy", line 6, in <module>
    main(__file__)
File "/usr/lib64/python3.5/site-packages/mypy/main.py", line 49, in main
    type_check_only(sources, bin_dir, options)
File "/usr/lib64/python3.5/site-packages/mypy/main.py", line 92, in type_check_only
    python_path=options.python_path)
File "/usr/lib64/python3.5/site-packages/mypy/build.py", line 196, in build
    result = manager.process(initial_states)
File "/usr/lib64/python3.5/site-packages/mypy/build.py", line 378, in process
    next.process()
File "/usr/lib64/python3.5/site-packages/mypy/build.py", line 832, in process
    self.type_checker().visit_file(self.tree, self.tree.path)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 371, in visit_file
    self.accept(d)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 528, in accept
    return visitor.visit_expression_stmt(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 1305, in visit_expression_stmt
    self.accept(s.expr)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 378, in accept
    typ = node.accept(self)
File "/usr/lib64/python3.5/site-packages/mypy/nodes.py", line 930, in accept
    return visitor.visit_member_expr(self)
File "/usr/lib64/python3.5/site-packages/mypy/checker.py", line 1767, in visit_member_expr
    return self.expr_checker.visit_member_expr(e)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 680, in visit_member_expr
    result = self.analyze_ordinary_member_access(e, False)
File "/usr/lib64/python3.5/site-packages/mypy/checkexpr.py", line 693, in analyze_ordinary_member_access
    self.named_type, self.msg)
File "/usr/lib64/python3.5/site-packages/mypy/checkmember.py", line 84, in analyze_member_access
    result = analyze_class_attribute_access(itype, name, node, is_lvalue, builtin_type, msg)
File "/usr/lib64/python3.5/site-packages/mypy/checkmember.py", line 212, in analyze_class_attribute_access
    node = itype.type.get(name)
AttributeError: 'TupleType' object has no attribute 'type'

[JukkaL]

Thanks for the example! I'll look into this.

[JukkaL]

The crash is now fixed, but the _fields attribute is still not recognized. Added a new issue #1076 to track that.

[elazarg]

See PR #1810