Pandas nunique

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Pandas nunique

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Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric Python packages. Pandas is one of those packages and makes importing and analyzing data much easier. Pandas dataframe. If we set the value of the axis to 0, then it finds the total number of unique observations over the index axis. If we set the value of the axis to 1, then it finds the total number of unique observations over the column axis.

Being able to count unique values can have important use cases. For example, this can be used in testing your code. Similarly, it can be used in machine learning projects. Want to learn how to find unique values instead? Check out this guide to the unique method. To follow along with this tutorial, copy and paste the code below to load a sample Pandas DataFrame. Your results, then, will of course vary. The method takes two parameters:.

Pandas nunique

You can use the nunique function to count the number of unique values in a pandas DataFrame. The following examples show how to use this function in practice with the following pandas DataFrame:. The following code shows how to count the number of unique values in each column of a DataFrame:. The following code shows how to count the number of unique values in each row of a DataFrame:. The following code shows how to count the number of unique values by group in a DataFrame:. The following tutorials explain how to perform other common operations in pandas:. Your email address will not be published. Skip to content Menu.

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Build fast and responsive sites using our free W3. Tech Interview Prep. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. It also provides the feature to exclude the NaN values from the count of unique numbers. Create your own website with W3Schools Spaces - no setup required. What is an Exercise? SparkContext pyspark. ResourceInformation pyspark. DataFrame pyspark.

This article begins by explaining the basic usage of each method, then shows how to get unique values and their counts, and more. The describe method is useful to compute summary statistics including the mode and its frequency. The pandas version used in this article is as follows.

Did you find this helpful? AccumulatorParam pyspark. TaskResourceRequests Errors pyspark. Work Experiences. Webinars Sessions with our global developer community. Example 2: Use nunique function to find the number of unique values over the index axis in a Dataframe. PythonModelWrapper pyspark. Add Other Experiences. Frequently Asked Questions. Return value This method returns the number of entries in the requested columns. Additional Information.