AttributeError: 'Unparser' object has no attribute '_str'. Did you mean: '_Str'? pyflowchart 0.3.1 with python 3.11 and astunparse 1.6.3

[cdfmlr]

As pyflowchart 0.3.1 used with python 3.11 and astunparse 1.6.3 throws an exception:

Traceback (most recent call last):
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\flowchart.py", line 12, in <module>
    fc = pfc.parse(code)
         ^^^^^^^^^^^^^^^
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\new_env\Lib\site-packages\pyflowchart\ast_node.py", line 659, in parse
    node = ast_node_class(ast_object, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\new_env\Lib\site-packages\pyflowchart\ast_node.py", line 463, in __init__
    OperationNode.__init__(self, operation=self.ast_to_source())
                                           ^^^^^^^^^^^^^^^^^^^^
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\new_env\Lib\site-packages\pyflowchart\ast_node.py", line 33, in ast_to_source
    return astunparse.unparse(self.ast_object).strip()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\new_env\Lib\site-packages\astunparse\__init__.py", line 13, in unparse
    Unparser(tree, file=v)
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\new_env\Lib\site-packages\astunparse\unparser.py", line 38, in __init__
    self.dispatch(tree)
  File "C:\Downloads\sc-navigator-model-generation-cp\APO Input Workflow\src\new_env\Lib\site-packages\astunparse\unparser.py", line 65, in dispatch
    meth = getattr(self, "_"+tree.__class__.__name__)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Unparser' object has no attribute '_str'. Did you mean: '_Str'?

How do I resolve this issue?

Originally posted by @kaasima10 in https://github.com/cdfmlr/pyflowchart/issues/28#issuecomment-2101265384

[cdfmlr]

@kaasima10 I have tested pyflowchart 0.3.1 with python 3.11 and astunparse 1.6.3 as you described, on some basic cases I tried, it works fine. Would you mind to post your inputted python source code and command executed that helps reproduce this problem?

[kaasima10]

this is my python code :-

import pyflowchart as pfc import inspect

def example_function(x): if x > 0: return 'Positive' elif x < 0: return 'Negative' else: return 'Zero'

code = inspect.getsource(example_function) fc = pfc.parse(code) flowchart = fc.flowchart() print(flowchart)

@cdfmlr I encountered an AttributeError when attempting to convert a simple Python function to a flowchart using the pyflowchart library. The function is straightforward, but the error occurs during the conversion process.

[cdfmlr]

Thanks. Have figured it out.

You should use:

from pyflowchart import Flowchart

...

fc = Flowchart.from_code(code)

...

instead of:

import pyflowchart as pfc

...

fc = pfc.parse(code)

...

As described in our document section Python to Flowchart, Flowchart.from_code is the right method you are expected to converts python source code from a str to the flowchart:

https://github.com/cdfmlr/pyflowchart/blob/dcb5128ac34a8ac76676877fcde17613b00704be/pyflowchart/flowchart.py#L42-L56

Meanwhile, parse is an internal function that parses the abstract syntax trees of python codes, instead of a str of python source code:

https://github.com/cdfmlr/pyflowchart/blob/dcb5128ac34a8ac76676877fcde17613b00704be/pyflowchart/ast_node.py#L929-L943

Users shall never call this function from the out of the package.