Crash under very specific scenario

[An-dz]

Description

Good Smell was crashing on one of my files and I managed to reduce it to a minimal reproducible case. It crashes only if there's a for using a range that takes a len and that inside the loop it appends to a list an object that is part of a list described in a Class. Code is below.

To Reproduce

1. Save the following file somewhere:

for i in range(len(random_a)):
    random_b.append(RandomClass.random_c[i])

2. Run good_smell warn on the file
3. Get error

Expected behavior

Good smell should not crash, especially when running with flake8 as it breaks all of flake8.

Desktop

• OS: Arch Linux and Windows 8.1
• Python version: 3.7.4
• Version good_smell 0.13.0

Additional context

Might be related with #61

Error log:

Traceback (most recent call last):
  File "C:\Program Files\Python37\Scripts\good_smell-script.py", line 11, in <module>
    load_entry_point('good-smell==0.13.0', 'console_scripts', 'good_smell')()
  File "c:\program files\python37\lib\site-packages\good_smell\main.py", line 46, in main
    Fire({"fix": print_fixed_smell, "warn": print_smell_warnings})
  File "c:\program files\python37\lib\site-packages\fire\core.py", line 127, in Fire
    component_trace = _Fire(component, args, context, name)
  File "c:\program files\python37\lib\site-packages\fire\core.py", line 366, in _Fire
    component, remaining_args)
  File "c:\program files\python37\lib\site-packages\fire\core.py", line 542, in _CallCallable
    result = fn(*varargs, **kwargs)
  File "c:\program files\python37\lib\site-packages\good_smell\main.py", line 14, in print_smell_warnings
    for warning in smell_warnings(Path(path).read_text(), path)
  File "c:\program files\python37\lib\site-packages\good_smell\main.py", line 13, in <genexpr>
    warning.warning_string()
  File "c:\program files\python37\lib\site-packages\good_smell\main.py", line 22, in smell_warnings
    source_code=source, path=str(path)
  File "c:\program files\python37\lib\site-packages\good_smell\ast_smell.py", line 29, in check_for_smell
    transformer.visit(self.tree)
  File "c:\program files\python37\lib\site-packages\good_smell\ast_smell.py", line 20, in visit
    return self.generic_visit(node)
  File "c:\program files\python37\lib\ast.py", line 317, in generic_visit
    value = self.visit(value)
  File "c:\program files\python37\lib\site-packages\good_smell\ast_smell.py", line 22, in visit
    return super().visit(node)
  File "c:\program files\python37\lib\ast.py", line 262, in visit
    return visitor(node)
  File "c:\program files\python37\lib\site-packages\good_smell\smells\range_len_fix.py", line 57, in visit_For
    new_body = deleter.visit(node).body or [ast.Pass()]
  File "c:\program files\python37\lib\ast.py", line 262, in visit
    return visitor(node)
  File "c:\program files\python37\lib\ast.py", line 317, in generic_visit
    value = self.visit(value)
  File "c:\program files\python37\lib\ast.py", line 262, in visit
    return visitor(node)
  File "c:\program files\python37\lib\ast.py", line 326, in generic_visit
    new_node = self.visit(old_value)
  File "c:\program files\python37\lib\ast.py", line 262, in visit
    return visitor(node)
  File "c:\program files\python37\lib\ast.py", line 317, in generic_visit
    value = self.visit(value)
  File "c:\program files\python37\lib\ast.py", line 262, in visit
    return visitor(node)
  File "c:\program files\python37\lib\site-packages\good_smell\smells\range_len_fix.py", line 46, in visit_Subscript
    if self.accesses_seq(node):
  File "c:\program files\python37\lib\site-packages\good_smell\smells\range_len_fix.py", line 40, in accesses_seq
    and node.value.id == self.seq.id
AttributeError: 'Attribute' object has no attribute 'id'