For this Question: Find employees who have not been referred to you by a manager 1. 
Output the first name of the employee.DataFrame/SQL Table with the following schema -
<schema>[{'name': 'employee', 'columns': [{'name': 'id', 'type': 'int64'}, {'name': 'first_name', 'type': 'object'}, {'name': 'last_name', 'type': 'object'}, {'name': 'age', 'type': 'int64'}, {'name': 'sex', 'type': 'object'}, {'name': 'employee_title', 'type': 'object'}, {'name': 'department', 'type': 'object'}, {'name': 'salary', 'type': 'int64'}, {'name': 'target', 'type': 'int64'}, {'name': 'bonus', 'type': 'int64'}, {'name': 'email', 'type': 'object'}, {'name': 'city', 'type': 'object'}, {'name': 'address', 'type': 'object'}, {'name': 'manager_id', 'type': 'int64'}]}]</schema>Each row in a new line and each value of a row separated by a |, i.e.,
0|1|2
1|2|3
2|3|4-, I have written this Solution Code: mask = employee['manager_id'] != 1
df = employee[mask]
for i,row in df.iterrows():
    print(row['first_name']), In this Programming Language: Python, Now tell me if this Code is compilable or not?