search
Search
Login
Map of Data Science
menu
menu search toc more_vert
Robocat
Guest 0reps
Sign up
Log in
account_circleMy Profile homeAbout paidPricing
emailContact us
exit_to_appLog out
Map of data science
Thanks for the thanks!
close
Comments
Log in or sign up
Cancel
Post
account_circle
Profile
exit_to_app
Sign out
help Ask a question
Share on Twitter
search
keyboard_voice
close
Searching Tips
Search for a recipe:
"Creating a table in MySQL"
Search for an API documentation: "@append"
Search for code: "!dataframe"
Apply a tag filter: "#python"
Useful Shortcuts
/ to open search panel
Esc to close search panel
to navigate between search results
d to clear all current filters
Enter to expand content preview
icon_star
Doc Search
icon_star
Code Search Beta
SORRY NOTHING FOUND!
mic
Start speaking...
Voice search is only supported in Safari and Chrome.
Navigate to
A
A
brightness_medium
share
arrow_backShare
Twitter
Facebook

Pandas DataFrame | first_valid_index method

Pandas
chevron_right
Documentation
chevron_right
DataFrame
chevron_right
Time Series
schedule Jul 1, 2022
Last updated
local_offer PythonPandas
Tags
tocTable of Contents
expand_more
map
Check out the interactive map of data science

Pandas DataFrame.first_valid_index(~) method returns the index of the first occurrence of a row containing a non-NaN value. The check is performed row-wise, starting from the first row.

Note that in the following cases, None is returned:

  • if all entries of the source DataFrame are NaN

  • if the source DataFrame is empty

Parameters

This method has no parameters.

Return Value

The row label of the first occurrence of a row containing at least one non-NaN. The returned type hence depends on the index of your DataFrame.

Examples

Consider the following DataFrame:

df = pd.DataFrame({"A":[np.NaN,3,np.NaN], "B":[np.NaN,np.NaN, 6]}, index=["a","b","c"])
df
A B
a NaN NaN
b 3.0 NaN
c NaN 6.0

The index of the first non-NaN value in the DataFrame is:

df.first_valid_index()
'b'

Here, the output is 'b' because the first row with a non-NaN value has the label of 'b'.

robocat
Published by Isshin Inada
Edited by 0 others
Did you find this page useful?
thumb_up
thumb_down
Ask a question or leave a feedback...
thumb_up
0
thumb_down
0
chat_bubble_outline
0
settings
Enjoy our search
Hit / to insta-search docs and recipes!