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Pandas DataFrame | transpose method

Programming
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Python
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Pandas
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Documentation
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DataFrame
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Sorting and Restructuring DataFrames
schedule Jul 1, 2022
Last updated
local_offer PythonPandas
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Pandas DataFrame.transpose(~) method swaps the rows and columns of the source DataFrame.

WARNING

The transpose of a DataFrame, whose column(s) contain mixed types, will have columns of type object. Check out the examples below for clarification.

Parameters

1. copy | boolean | optional

Whether or not to create a new copy of the source DataFrame. Note that a copy represents a new DataFrame, that is, modifying the transpose would not mutate the original DataFrame and vice versa. By default, copy=False.

WARNING

The source DataFrame is always copied if any of its columns contains mixed types (e.g. a mix of strings and numerics).

Return Value

The transposed DataFrame.

Examples

Basic usage

Consider the following DataFrame:

df = pd.DataFrame({"A":[3,4],"B":[5,6]})
df
   A  B
0  3  5
1  4  6

Taking its transpose gives:

df.transpose()
   0  1
A  3  4
B  5  6

Notice how the rows and columns are swapped.

Case when columns contain mixed types

Consider the following DataFrame:

df = pd.DataFrame({"A":[3,4],"B":[True,6]})
df
   A  B
0  3  True
1  4  6

Here, column B contains mixed-types: a boolean and a numeric.

Computing the transpose gives:

df.transpose()
0 1
A 3 4
B True 6

At first glance, you'd think the new column 1 would be of type numeric. However, this isn't the case:

df.transpose().dtypes
0 object
1 object
dtype: object

We see that column 1 is actually of type object, instead of int. This is because the transpose of a DataFrame whose column(s) contain mixed types will have all of its columns as type object.

robocat
Published by Isshin Inada
Edited by 0 others
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