human
Solve the following python programming problem given the following code:
def __init__(self, form, fieldsets, prepopulated_fields, readonly_fields = None, model_admin = None) : 
    '
    Monkey-patch for django 1.5
    ' 
    def normalize_fieldsets(fieldsets) : 
        '
        Make sure the keys in fieldset dictionaries are strings. Returns the
        normalized data.
        ' 
        result = [] 
        for (name, options) in fieldsets : 
            result.append ((name, normalize_dictionary (options))) 
return result 
def normalize_dictionary(data_dict) : 
        '
        Converts all the keys in "data_dict" to strings. The keys must be
        convertible using str().
        ' 
        for (key, value) in data_dict.items () : 
            if (not isinstance (key, str)) : 
                del data_dict [key] 
                data_dict [str (key)] = value 
return data_dict 
if isinstance (prepopulated_fields, list) : 
        prepopulated_fields = dict () 
(self.form, self.fieldsets) = (form, normalize_fieldsets (fieldsets)) 
    self.prepopulated_fields = [{ 
        'field' : f [field_name], 
        'dependencies' : [form [f] for f in dependencies], 
} for (field_name, dependencies) in prepopulated_fields.items ()] 
    self.model_admin = model_admin 
    if (readonly_fields is None) : 
        readonly_fields = () 
self.readonly_fields = readonly_fields 

    
    

    Fix the buggy line: 'field' : f [field_name] ,
assistant
#Here is Python code to fix the buggy line: 'field' : f [field_name] ,
.

'field' : form [field_name] ,