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You have two lists, so using:

[df.columns.values.tolist()] + df.values.tolist()

[['Col 1', 'Col 2', 'Col 3'], [1, 2, 3], [4, 5, 6], [7, 8, 9]]

[df.columns.values.tolist()] + df.values.tolist() >>> [['Col 1', 'Col 2', 'Col 3'], [1, 2, 3], [4, 5, 6], [7, 8, 9]] 

You have two lists, so:

[df.columns.values.tolist()] + df.values.tolist()

[['Col 1', 'Col 2', 'Col 3'], [1, 2, 3], [4, 5, 6], [7, 8, 9]]

You have two lists, so using:

[df.columns.values.tolist()] + df.values.tolist() >>> [['Col 1', 'Col 2', 'Col 3'], [1, 2, 3], [4, 5, 6], [7, 8, 9]] 
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patricio
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You have two lists, so:

[df.columns.values.tolist()] + df.values.tolist()

[['Col 1', 'Col 2', 'Col 3'], [1, 2, 3], [4, 5, 6], [7, 8, 9]]