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Given the following text description, write Python code to implement the functionality described below step by step
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Description:
 Test notebook
This is a text notebook. Here are some rich text, code, $\pi\simeq 3.1415$ equations.
Another equation
Step1:  Random code
Step2:  some text
Step3:  An image
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Python Code:
# some code in python
def f(x):
    y = x * x
    return y
Explanation: Test notebook
This is a text notebook. Here are some rich text, code, $\pi\simeq 3.1415$ equations.
Another equation:
$$\sum_{i=1}^n x_i$$
Python code:
End of explanation
import IPython
print("Hello world!")
2*2
def decorator(f):
    return f
@decorator
def f(x):
    pass
3*3
Explanation: Random code:
javascript
console.log("hello" + 3);
Python code:
End of explanation
print(4*4)
%%bash
echo 'hello'
Explanation: some text
End of explanation
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline
plt.imshow(np.random.rand(5,5,4), interpolation='none');
Explanation: An image:
Subtitle
a list
One small link!
Two
2.1
2.2
Three
and
Un
Deux
End of explanation
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