How to convert a Pandas Index to a List

How to convert a Pandas Index to a List

To convert a Pandas Index to a List, you can use the tolist method.

This method is applied to a Index object and returns a new list containing the values in the Index.

Example

For example, consider the following DataFrame:

import pandas as pd

df = pd.DataFrame({
    'A': [1, 2, 3, 4, 5],
    'B': [10, 20, 30, 40, 50],
    'C': [100, 200, 300, 400, 500]
})

This DataFrame has three columns A, B, and C, with five rows of data. The DataFrame also has an Index object containing the row labels for the data.

To convert the Index to a list, you could do the following:

import pandas as pd

df = pd.DataFrame({
    'A': [1, 2, 3, 4, 5],
    'B': [10, 20, 30, 40, 50],
    'C': [100, 200, 300, 400, 500]
})

# Convert the Index to a list
idx_list = df.index.tolist()

# Print the resulting list
print(idx_list)

[0, 1, 2, 3, 4]

In the code above, the tolist method is applied to the Index object of the DataFrame, which converts the Index to a new list containing the row labels. In this case, the resulting list has the values 0, 1, 2, 3, 4.

You can also use the tolist method on a Series object to convert the Index of that Series to a list.

For example, if you wanted to convert the Index of the B column to a list, you could do the following:

import pandas as pd

df = pd.DataFrame({
    'A': [1, 2, 3, 4, 5],
    'B': [10, 20, 30, 40, 50],
    'C': [100, 200, 300, 400, 500]
})

# Convert the Index of column B to a list
idx_list = df['B'].index.tolist()

# Print the resulting list
print(idx_list)

[0, 1, 2, 3, 4]

In the code above, the tolist method is applied to the Index object of the B column, which converts the Index to a new list containing the row labels. In this case, the resulting list has the values 0, 1, 2, 3, 4.