Python | Pandas dataframe.notna()
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.notna() function detects existing/ non-missing values in the dataframe. The function returns a boolean object having the same size as that of the object on which it is applied, indicating whether each individual value is a na value or not. All of the non-missing values gets mapped to true and missing values get mapped to false.
Note : Characters such as empty strings ” or numpy.inf are not considered NA values. (unless you set pandas.options.mode.use_inf_as_na = True).
Returns : Mask of bool values for each element in DataFrame that indicates whether an element is not an NA value
Example #1: Use notna() function to find all the non-missing value in the dataframe.
Let’s use the dataframe.notna() function to find all the non-missing values in the dataframe.
As we can see in the output, all the non-missing values in the dataframe has been mapped to true. There is no false value as there is no missing value in the dataframe.
Example #2: Use notna() function to find the non-missing values, when there are missing values in the dataframe.
As we can see in the output, cells which were having na values were mapped as false and all the cells which were having non-missing values were mapped as true.