How to Convert Pandas Series to DataFrame

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Sathiya Sarathi Feb 02, 2024
Pandas Pandas DataFrame Pandas Series
  1. Convert a Single Pandas Series to DataFrame Using pandas.DataFrame()
  2. Convert a Single Pandas Series to DataFrame Using pandas.Series.to_frame()
  3. Convert Multiple Pandas Series to Dataframes
How to Convert Pandas Series to DataFrame

The creation of newer columns out of the derived or existing Series is a formidable activity in feature engineering. The newly created Series or column can be converted into Dataframe using pandas’ native functions. In this article, We will introduce how to convert Pandas Series to Dataframe.

In the following examples, we will work on the dataframe created using the following snippet.

import pandas as pd
import numpy as np

np.random.seed(0)

df_series = pd.Series(
    np.random.randint(0, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
)

print(df_series)

Output:

a    44
b    47
c    64
d    67
e    67
f     9
g    83
h    21
i    36
j    87
dtype: int64

Convert a Single Pandas Series to DataFrame Using pandas.DataFrame()

The Series can be transformed into a Dataframe using the DataFrame() constructor by sending the Pandas Series as an argument.

import pandas as pd
import numpy as np

np.random.seed(0)

df_series = pd.Series(
    np.random.randint(0, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
)

print(pd.DataFrame(df_series, columns=["A"]))

Output:

    A
a  81
b  37
c  25
d  77
e  72
f   9
g  20
h  80
i  69
j  79

As seen above, the output of the function returns a Dataframe.

Convert a Single Pandas Series to DataFrame Using pandas.Series.to_frame()

This to_frame() function converts the given Pandas Series to a Dataframe. The name of the column can be set with the name argument.

import pandas as pd
import numpy as np

np.random.seed(0)

df_series = pd.Series(
    np.random.randint(0, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
)

print(df_series.to_frame(name="A"))

Output:

    A
a  44
b  47
c  64
d  67
e  67
f   9
g  83
h  21
i  36
j  87

There can be scenarios where the given series doesn’t have any name to it. In situations like these, the reset_index() method can come in handy.

import pandas as pd
import numpy as np

np.random.seed(0)

df_series = pd.Series(
    np.random.randint(0, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
).rename_axis("index")

print(df_series)
print("\n")
print(df_series.reset_index())

Output:

index
a    44
b    47
c    64
d    67
e    67
f     9
g    83
h    21
i    36
j    87
dtype: int64


  index   0
0     a  44
1     b  47
2     c  64
3     d  67
4     e  67
5     f   9
6     g  83
7     h  21
8     i  36
9     j  87

As seen above, the created dataframe contains a new column named 0. The column named 0 can be renamed using the name argument that can be provided to the reset_index() function, as shown below.

import pandas as pd
import numpy as np

np.random.seed(0)

df_series = pd.Series(
    np.random.randint(0, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
).rename_axis("index")

print(df_series)
print("\n")
print(df_series.reset_index(name="A"))

Output:

index
a    44
b    47
c    64
d    67
e    67
f     9
g    83
h    21
i    36
j    87
dtype: int64


  index   A
0     a  44
1     b  47
2     c  64
3     d  67
4     e  67
5     f   9
6     g  83
7     h  21
8     i  36
9     j  87

Convert Multiple Pandas Series to Dataframes

The above examples have demonstrated the ability to convert just a single Pandas Series to a Dataframe. What if there were multiple Series, and these need to be stitched together to one single Dataframe? Upon creating the individual Series, the dataframe can be created by concatenating using the concat() function.

import pandas as pd
import numpy as np

np.random.seed(0)

df_series1 = pd.Series(
    np.random.randint(0, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
)
df_series2 = pd.Series(
    np.random.randint(40, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
)
df_series3 = pd.Series(
    np.random.randint(80, 100, size=(10)),
    index=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
)

df_stitched = pd.concat([df_series1, df_series2, df_series3], axis=1)

print(df_stitched)

Output:

    0   1   2
a  44  46  97
b  47  64  85
c  64  64  93
d  67  52  88
e  67  98  89
f   9  41  99
g  83  78  96
h  21  79  99
i  36  63  85
j  87  86  95

Note that the pd.concat() function included an axis=1 argument, which corresponds to the append along the column. If axis is not provided, there will be a row merge or union across all the Dataframes.

Related Article - Pandas DataFrame

Related Article - Pandas Series