Converting Pandas Series to DataFrame using Python

Python offers two data structures, namely pandas series and dataframes, which are extensively used to manipulate sequential or tabular data. At times, it becomes necessary to convert one or multiple series objects into a dataframe. The present article delves into the process of transforming a pandas series into a dataframe in Python.

Converting Pandas Series to DataFrame Using the to_frame() Method

We can convert a pandas series into a dataframe effortlessly using the to_frame() method. By invoking the to_frame() method on a series object, we can obtain the dataframe representation of the series. Let us examine the following example to comprehend this process better.

import pandas as pd

numbers = [100, 90, 80, 90, 70, 100, 60]

series = pd.Series(numbers)

print("Original series:")

print(series)

df = series.to_frame()

print("New dataframe:")

print(df)

Output:

The series is:

0 100

1 90

2 80

3 90

4 70

5 100

6 60

dtype: int64

The dataframe is:

0

0 100

1 90

2 80

3 90

4 70

5 100

6 60

In the aforementioned example, we initially converted a list into a series utilizing the Series() function. Subsequently, we employed the to_frame() method to transform the series into a dataframe. It is important to note that the input series lacks any indices.

336x280-1.png

If the input series consists of indices, these indices are converted into the dataframe's indices. Take a look at the subsequent example to understand this concept.

import pandas as pd

numbers = [100, 90, 80, 90, 70, 100, 60]

indices = [1, 2, 4, 5, 6, 7, 8]

series = pd.Series(numbers, index=indices)

print("Original series:")

print(series)

df = series.to_frame()

print("New dataframe:")

print(df)

Output:

The series is:

1 100

2 90

4 80

5 90

6 70

7 100

8 60

dtype: int64

The dataframe is:

0

1 100

2 90

4 80

5 90

6 70

7 100

8 60

In this particular example, we initially created a series featuring custom indices. Following that, we utilized the to_frame() method to convert this series into a dataframe. As you can observe, the series indices have now transformed into the dataframe index.

Upon converting a pandas series into a dataframe using the to_frame() method, the new column created in the dataframe is named "0".

If you desire to explicitly name the column, you can specify the desired column name using the name parameter in the to_frame() method. Upon execution, the to_frame() method will return a dataframe with the specified column name. The subsequent example illustrates this notion.

import pandas as pd

numbers = [100, 90, 80, 90, 70, 100, 60]

The series supplied consists of the numbers [1,2,4,5,6,7,8]. This series is then converted into a dataframe, which is displayed as follows:

The series is:

1 100

2 90

4 80

5 90

6 70

7 100

8 60

dtype: int64

The dataframe is:

Numbers

1 100

2 90

4 80

5 90

6 70

7 100

8 60

In this particular example, the "Numbers" string is passed as an argument to the name parameter within the to_frame() method. As a result, the output dataframe is labeled with the column name "Numbers" instead of the default "0".

Converting a Pandas Series to a DataFrame Using the DataFrame() Function

Instead of utilizing the to_frame() method, one has the alternative of using the DataFrame() function to transform a pandas series into a dataframe. This function takes the series as its input argument and produces the desired dataframe as demonstrated below:

import pandas as pd

numbers = [100, 90, 80, 90, 70, 100, 60]

series = pd.Series(numbers)

print("The series is:")

print(series)

df = pd.DataFrame(series)

print("The dataframe is:")

print(df)

Output:

The series is:

0 100

1 90

2 80

3 90

4 70

5 100

6 60

dtype: int64

The dataframe is:

0 100

1 90

2 80

3 90

4 70

5 100

6 60

In the preceding example, it can be observed that the output dataframe's column name is automatically set to "0". To assign a custom column name to the output dataframe, one can provide the desired name as a parameter to the columns argument within the DataFrame() function, as shown below:

import pandas as pd

numbers = [100, 90, 80, 90, 70, 100, 60]

series = pd.Series(numbers)

print("The series is:")

print(series)

df = pd.DataFrame(series, columns=["Numbers"])

print("The dataframe is:")

print(df)

Output:

The series is:

0 100

1 90

2 80

3 90

4 70

5 100

6 60

dtype: int64

The dataframe is:

Numbers

0 100

1 90

2 80

3 90

4 70

5 100

6 60

If the input series contains custom indices, these indices will be copied into the resulting dataframe. This can be witnessed in the subsequent example:

import pandas as pd

numbers = [100, 90, 80, 90, 70, 100, 60]

indices = [1, 2, 4, 5, 6, 7, 8]

series = pd.Series(numbers, index=indices)

print("The series is:")

print(series)

df = pd.DataFrame(series, columns=["Numbers"])

print("The dataframe is:")

print(df)

Output:

The series is:

1 100

2 90

4 80

5 90

6 70

7 100

8 60

dtype: int64

The dataframe is:

Numbers

1 100

2 90

4 80

5 90

6 70

7 100

8 60

Transforming the Series Index into a DataFrame Column

In the aforementioned examples, it should be noted that the indices of the input series are transformed into the dataframe's index. If one wishes to transform the indices of the input series into a column within the resultant dataframe, the reset_index() method can be employed.

The method reset_index() performs a transformation on a series by converting its index into a column and returning the resulting dataframe, which can be seen below.

import pandas as pd

numbers=[100,90,80,90,70,100,60]

indices=[1,2,4,5,6,7,8]

series=pd.Series(numbers,index=indices)

print("The series is:")

print(series)

df=series.reset_index()

print("The dataframe is:")

print(df)Output:

The series is:

1 100

2 90

4 80

5 90

6 70

7 100

8 60

dtype: int64

The dataframe is:

index 0

0 1 100

1 2 90

2 4 80

3 5 90

4 6 70

5 7 100

6 8 60In this particular example, it can be observed that the index of the series is transformed into the column labeled "index" in the resulting dataframe. However, the column that contains the values is referred to as "0". To assign a specific name to the column that contains the values, you can specify the desired name through the name parameter of the reset_index() method as demonstrated in the following example.

import pandas as pd

numbers=[100,90,80,90,70,100,60]

indices=[1,2,4,5,6,7,8]

series=pd.Series(numbers,index=indices)

print("The series is:")

print(series)

df=series.reset_index(name="Numbers")

print("The dataframe is:")

print(df)Output:

The series is:

1 100

2 90

4 80

5 90

6 70

7 100

8 60

dtype: int64

The dataframe is:

index Numbers

0 1 100

1 2 90

2 4 80

3 5 90

4 6 70

5 7 100

6 8 60

Transformation of Series Index to DataFrame Columns using the DataFrame() Function

To convert the index of a series to columns in a dataframe with desired column names, the following steps will be undertaken.

  • Initially, a list of indices will be obtained using the index attribute of the series.
  • Subsequently, a list of values will be obtained using the values attribute of the series.
  • Upon completion, a python dictionary will be created utilizing the aforementioned lists. This will involve using the desired dataframe column names as keys in the dictionary, with the list of indices and values serving as the associated values.
  • Once the dictionary has been constructed, it will be transformed into a dataframe through the use of the DataFrame() function. This function will accept a list containing the dictionary as its input argument and provide the resulting dataframe as output.

Upon executing the aforementioned steps, you will obtain the desired output dataframe. This process can be observed in the following example.

import pandas as pd

numbers=[100,90,80,90,70,100,60]

indices=["A","B","C","D","E","F","G"]

series=pd.Series(numbers,index=indices)

print("The series is:")

print(series)

values=series.values

index_values=series.index

myDict=dict()

for i in range(len(values)):

key=index_values[i]

value=values[i]

myDict[key]=value

print("The dictionary is:")

print(myDict)

df=pd.DataFrame([myDict])

print("The dataframe is:")

print(df)Output:

The series is:

A 100

B 90

The numbers listed are as follows:

C 80

D 90

E 70

F 100

G 60

So, in dictionary form, they can be represented as:

{'A': 100, 'B': 90, 'C': 80, 'D': 90, 'E': 70, 'F': 100, 'G': 60}

And in dataframe form, they appear like this:

A B C D E F G

0 100 90 80 90 70 100 60

A Different Approach to Transforming Multiple Series into a DataFrame using Pandas

Rather than working with a single series, it is also possible to convert multiple series into a dataframe using pandas. In this scenario, there are two available approaches: converting the series into rows or into columns within the resulting dataframe. Both approaches will be thoroughly explained below.

Converting Multiple Series Objects into Rows of a DataFrame

To translate multiple series into rows of a pandas dataframe, the DataFrame() function proves very useful. By providing a list of series objects as input arguments to DataFrame(), a dataframe will be returned in response.

An illustration of this process can be observed in the following example:

import pandas as pd

numbers1=[100,90,80,90,70,100,60]

numbers2=[1,2,3,4,5,6,7]

series1=pd.Series(numbers1)

series2=pd.Series(numbers2)

print("The first series is:")

print(series1)

print("The second series is:")

print(series2)

df=pd.DataFrame([series1,series2])

print("The dataframe is:")

print(df)

Output:

The first series is:

0 100

1 90

2 80

3 90

4 70

5 100

6 60

dtype: int64

The second series is:

0 1

1 2

2 3

3 4

4 5

5 6

6 7

dtype: int64

The dataframe is:

0 1 2 3 4 5 6

0 100 90 80 90 70 100 60

1 1 2 3 4 5 6 7

Converting Multiple Series into Columns of a DataFrame

If the aim is to convert multiple series into columns of a pandas dataframe, the concat() function from the pandas module can be employed. To do this, one must provide a list of series as the first input argument to the concat() function. Additionally, setting the axis parameter to 1, the resulting dataframe will showcase all the input series objects as columns.

This process can be understood further through the following example:

import pandas as pd

numbers1=[100,90,80,90,70,100,60]

numbers2=[1,2,3,4,5,6,7]

series1=pd.Series(numbers1)

series2=pd.Series(numbers2)

print("The first series is:")

print(series1)

print("The second series is:")

print(series2)

df=pd.concat([series1,series2],axis=1)

print("The dataframe is:")

print(df)

Output:

The first series is:

0 100

1 90

2 80

3 90

4 70

5 100

6 60

dtype: int64

The second series is:

0 1

1 2

2 3

3 4

4 5

5 6

6 7

dtype: int64

The dataframe is:

0 1

0 100 1

1 90 2

2 80 3

3 90 4

4 70 5

5 100 6

6 60 7

Conclusion

Throughout this article, we have thoroughly discussed various methods for transforming a pandas series into a dataframe, as well as how to convert multiple series objects into dataframes using python. To expand your knowledge on pandas dataframes, consider reading this article on how to assign a column to a dataframe. Additionally, you may find this article on how to check for null values in pandas valuable.

Thank you for taking the time to peruse this article. Stay tuned for additional enlightening articles.

Have a delightful educational experience!

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