In programming, the nan value stands for Not A Number. When a NaN value appears in a list, it might cause errors in calculations. This article will also explore solutions for how to remove nan from list in python.

You may successfully remove the NaN from the list using the below methods and solve the error. Let’s jump right into it!

How To Remove Nan From List In Python?

In Python, you may use NumPy. isnan to remove nan from a list (). It is quite simple to apply. Let us use the following example to help you understand more: import numpy as np mylist = [18,12,float(‘nan’),25,56,44,float(‘nan’)] .

You may also use this example to remove nan from Python list: mylist = [18,285,’nan’,85,65,44,’nan’] mylist = [str(x) for x in mylist] print(mylist) newlist = [x for x in mylist if x != ‘nan’] print(newlist). We will demonstrate clearer in this next part.

The Methods

Method 1

This method uses an array as input and then returns True if the relating index is nan of False if it is not. Here’s an example.

import numpy as np
mylist = [18,12,float('nan'),25,56,44,float('nan')]

with output 

[18, 12, nan, 25, 56, 44, nan]

[18, 12, 25, 56, 44]

Method 2

Assume the list has been changed to string format, and we want to see if it includes any NaN values. After being converted to string type, the string equivalent to nan may be readily recognized and removed by comparing it to nan. Here’s an example of it.

mylist = [18,285,'nan',85,65,44,'nan']
print(newlist)

with output

[’18’, ‘285’, ‘nan’, ’85’, ’65’, ’44’, ‘nan’]

[’18’, ‘285’, ’85’, ’65’, ’44’]

Conclusion

About the methods for how to remove nan from list in Python, you may choose to solve it with NumPy. isnan() or string values. We hope they will also solve your problem if you plan to try them. Please inform us if you have any concerns about the issue so we can assist you. Thank you!