List function calls within a Python function declaration with the ast module.

list_fun_calls.py

"""List function calls within a Python function declaration with the ast module."""
import ast

class PrintCalls(ast.NodeVisitor):
    def visit_Call(self, node):
        print(node.func.id)


code = """def fun(a:int) -> int:
    b = util_fun(a)
    return b"""
print(code)
print()

tree = ast.parse(code)
PrintCalls().visit(tree)