How to write thus program in Python? (New to Python)

#5) complete the functions to process a list of user information 

user_list = [
    {'name': 'Alizom_12',
     'gender': 'f',
     'age': 34,
     'active_day': 170},
    {'name': 'Xzt4f',
     'gender': None,
     'age': None,
     'active_day': 1152},
    {'name': 'TomZ',
     'gender': 'm',
     'age': 24,
     'active_day': 15},
    {'name': 'Zxd975',
     'gender': None,
     'age': 44,
     'active_day': 752},
] 

def add_new_user(**kw):
    '''this function should allow to add a new user into the 
    user_list.
    '''
    
    return
 
def find_user(user_name):
    '''this function should find a user with given user_name.
    '''
    
    return
    
def update_user_info(user_name, **kw):
    '''this function should allow to update a user's info with 
    given user_name and the info to be updated.
    '''
    
    return

def user_statistic():
    ''' this function should return the basic statistic on
    user profiles with:
       1. gender statistic: number of f/m/None(not given)
       2. age statistic: oldest/youngest/average age
       3. average active_days
    ''' 
    return 

#pls use the following codes to test your functions

print(find_user('Alizom_12'))

update_user_info('Alizom_12', **{'age': 29})
print(find_user('Alizom_12'))

add_new_user(**{'name': 'Robot_1', 'gender': None, 'age': 1, 'active_day': 0})
print(find_user('Alizom_12'))

user_statistic()