[Python] "TypeError: 'DataFrame' object is not callable" [duplicate]

I'm trying to compute the mean age of blonde people from the data in df:

np.random.seed(0)
df = pd.DataFrame(
{
'Age': [18, 21, 28, 19, 23, 22, 18, 24, 25, 20],
'Hair colour': [
'Blonde', 'Brown', 'Black', 'Blonde', 'Blonde',
'Black','Brown', 'Brown', 'Black', 'Black'],
'Length (in cm)': np.random.normal(175, 10, 10).round(1),
'Weight (in kg)': np.random.normal(70, 5, 10).round(1)},
index=[
'Leon', 'Mirta', 'Nathan', 'Linda', 'Bandar',
'Violeta', 'Noah', 'Niji', 'Lucy', 'Mark'],)


I need to get the one number.

Firstly, I attempted to use the "df.divide".

import pandas as pd
import numpy as np

ans_3 = df({'Age'}).divide(df({'Hair colour': ['Blonde']}))


However, I have got this TypeError: 'DataFrame' object is not callable.

What should I do for working my code that I'll get the appropriate result?

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