How do you convert a Pandas DataFrame back into a list of lists?

Transforming Pandas DataFrame into a List of Lists

In the realm of pandas, it is a seamless task to convert a list of lists into a structured DataFrame using the DataFrame constructor. However, the reverse operation, turning a DataFrame back into a list of lists, poses a slight challenge.

To reclaim the list of lists from a DataFrame (df), access its underlying array (df.values) and invoke the tolist method. This method efficiently transforms the array into a nested list representation.

Below is a code snippet that demonstrates the process:

<code class="python">import pandas as pd

df = pd.DataFrame([[1, 2, 3], [3, 4, 5]])
lol = df.values.tolist()

print(lol)
# [[1, 2, 3], [3, 4, 5]]</code>

As illustrated in the code, df.values.tolist() retrieves the list of lists and stores it in lol. The resulting lol variable holds the original data in its list of lists format.

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