In python, i have two dictionaries as follows :-

tmp_result = { foo : {
            "package_file": test_file,
            "number_of_files": total_files,
            "less" : changelist,
            "test" : branch,
            
          }
    }


meta_data = {
    "bar" : "hello test"
    "hello" : "btent"
}  

I want to insert meta_data dictionary into tmp_result dictionary as follows :-

tmp_result = { foo : {
            "package_file": test_file,
            "number": total_file,
            "less" : changelist,
            "test" : branch,
            "bar"  : "hello test"
            "hello" : "btent"
          }
    }

I have this snippet :-

result = tmp_result[foo].update(meta_data)
print(result)

Outtpt is getting :- None