<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fill_fields(self, **kwargs):
 """Fills the fields referenced by kwargs keys and fill them with the value"""

        for name, value in kwargs.items():
            field = getattr(self, name)
            field.send_keys(value)