[Python] Parse the column value and save the first section in new column

I need to parse column values in a data frame and save the first parsed section in a new column if it has a parsing delimiter like "-" if not leave it empty

raw_data = {'name': ['Willard Morris', 'Al Jennings', 'Omar Mullins', 'Spencer McDaniel'],
'code': ['01-02-11-55-00115','11-02-11-55-00445','test', '31-0t-11-55-00115'],
'favorite_color': ['blue', 'blue', 'yellow', 'green'],
'grade': [88, 92, 95, 70]}
df = pd.DataFrame(raw_data)
df.head()


adding a new column that has the first parsed section and the expected column values are : 01 11 null 31

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