langgraph-codegen 0.1.5

Generate graph code from DSL for LangGraph framework

langgraph-codegen

Generates python code for parts of langgraph

from langgraph_codegen import gen_graph

graph_spec = """
# required: start with StateClass and first_node
START(StateClass) => first_node

first_node
  should_go_to_second => second_node
  => third_node

second_node => third_node

third_node => END
"""

graph_code = gen_graph("my_graph", graph_spec)
print(graph_code)

Output is:

# GENERATED code, creates compiled graph: my_graph
my_graph = StateGraph(StateClass)
my_graph.add_node('first_node', first_node)
my_graph.add_node('should_go_to_second', should_go_to_second)
my_graph.add_node('second_node', second_node)
my_graph.add_node('third_node', third_node)
my_graph.add_edge(START, 'first_node')
my_graph.add_edge('should_go_to_second', 'second_node')
my_graph.add_edge('should_go_to_second', 'third_node')
my_graph.add_edge('second_node', 'third_node')
my_graph.add_edge('third_node', END)

my_graph = my_graph.compile()

Syntax

START(StateClass) => first_node required

# anything after pound sign is ignored

node_1 => node_2 unconditional edge

node_X
  condition_A => node_Y
  condition_B => node_Z
  => END  # unconditional if all above conditions fail

node_1 => node_2, node_3 ok to transition to multiple nodes