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IsLocalDict Class — langchain Architecture

Architecture documentation for the IsLocalDict class in utils.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  bf16537a_3211_0c4e_b5e4_607d4a0bafb2["IsLocalDict"]
  ca66092c_447c_d201_0d3c_cfa6ca2cc9d3["utils.py"]
  bf16537a_3211_0c4e_b5e4_607d4a0bafb2 -->|defined in| ca66092c_447c_d201_0d3c_cfa6ca2cc9d3
  2395a235_1daa_5790_341c_73bd8613444f["__init__()"]
  bf16537a_3211_0c4e_b5e4_607d4a0bafb2 -->|method| 2395a235_1daa_5790_341c_73bd8613444f
  7431292a_23e8_37cf_fcb4_2dd29788b135["visit_Subscript()"]
  bf16537a_3211_0c4e_b5e4_607d4a0bafb2 -->|method| 7431292a_23e8_37cf_fcb4_2dd29788b135
  e4145a88_0e13_b701_6e5e_d650adaa4193["visit_Call()"]
  bf16537a_3211_0c4e_b5e4_607d4a0bafb2 -->|method| e4145a88_0e13_b701_6e5e_d650adaa4193

Relationship Graph

Source Code

libs/core/langchain_core/runnables/utils.py lines 158–205

class IsLocalDict(ast.NodeVisitor):
    """Check if a name is a local dict."""

    def __init__(self, name: str, keys: set[str]) -> None:
        """Initialize the visitor.

        Args:
            name: The name to check.
            keys: The keys to populate.
        """
        self.name = name
        self.keys = keys

    @override
    def visit_Subscript(self, node: ast.Subscript) -> None:
        """Visit a subscript node.

        Args:
            node: The node to visit.
        """
        if (
            isinstance(node.ctx, ast.Load)
            and isinstance(node.value, ast.Name)
            and node.value.id == self.name
            and isinstance(node.slice, ast.Constant)
            and isinstance(node.slice.value, str)
        ):
            # we've found a subscript access on the name we're looking for
            self.keys.add(node.slice.value)

    @override
    def visit_Call(self, node: ast.Call) -> None:
        """Visit a call node.

        Args:
            node: The node to visit.
        """
        if (
            isinstance(node.func, ast.Attribute)
            and isinstance(node.func.value, ast.Name)
            and node.func.value.id == self.name
            and node.func.attr == "get"
            and len(node.args) in {1, 2}
            and isinstance(node.args[0], ast.Constant)
            and isinstance(node.args[0].value, str)
        ):
            # we've found a .get() call on the name we're looking for
            self.keys.add(node.args[0].value)

Defined In

Source

Frequently Asked Questions

What is the IsLocalDict class?
IsLocalDict is a class in the langchain codebase, defined in libs/core/langchain_core/runnables/utils.py.
Where is IsLocalDict defined?
IsLocalDict is defined in libs/core/langchain_core/runnables/utils.py at line 158.

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