input: Write a function to port a Java code snippet to Python 3. The function should take a Java code snippet as an input and return the equivalent Python 3 code as an output.
  
  assert port_java_to_python(\"\"\"public class Foo {
    public int foo( int a, int b ) {
      return a + b;
    }
  }\"\"\")==\"def foo(a, b):\\n return a + b\"
  assert port_java_to_python(\"\"\"public class Bar {
    public int bar( int x ) {
      return x * x;
    }
  }\"\"\")==\"def bar(x):\\n return x * x\"
  assert port_java_to_python(\"\"\"public class Baz {
    public String baz( String s ) {
      return s + \" world\";
    }
  }\"\"\")==\"def baz(s):\\n return s + ' world'\"
  assert port_java_to_python(\"\"\"public class Qux {
    public boolean qux( boolean b ) {
      return !b;
    }
  }\"\"\")==\"def qux(b):\\n return not b\"
  assert port_java_to_python(\"\"\"public class Empty {}\"\"\")==\"pass\"
output: def port_java_to_python(java_code):
      if "public class" in java_code:
          class_name = java_code.split("public class")[1].split("{")[0].strip()
          if "public" in java_code:
              method_name = java_code.split("public")[1].split("(")[0].strip()
              params = java_code.split("(")[1].split(")")[0].split(",")
              params = [p.strip() for p in params]
              return_type = java_code.split("public")[1].split(" ")[1].strip()
              return_statement = java_code.split("return")[1].split(";")[0].strip()
              if return_type == "boolean":
                  return_statement = return_statement.replace("!", "not ")
              return f"def {method_name}({', '.join(params)}):\n return {return_statement}"
          else:
              return "pass"
      return "pass"