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How to Check Column Nulls and Replace: Pandas

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Here is a post that shows how to count Nulls and replace them with the value you want in the Pandas Dataframe. We have explained the process in two steps - Counting and Replacing the Null values. Count null values (column-wise) in Pandas ## count null values column-wise null_counts = df.isnull(). sum() print(null_counts) ``` Output: ``` Column1    1 Column2    1 Column3    5 dtype: int64 ``` In the above code, we first create a sample Pandas DataFrame `df` with some null values. Then, we use the `isnull()` function to create a DataFrame of the same shape as `df`, where each element is a boolean value indicating whether that element is null or not. Finally, we use the `sum()` function to count the number of null values in each column of the resulting DataFrame. The output shows the count of null values column-wise. to count null values column-wise: ``` df.isnull().sum() ``` ##Code snippet to count null values row-wise: ``` df.isnull().sum(axis=1) ``` In the above code, `df` is the Panda
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Vi Editor to Quit use Esc and Colon

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Here are vi editor commands you can use to quit from Vi editor with or without saving your work. These are useful to use in day-to-day work.

w => To Save Your Work
q => To Quit
wq => To Save and Quit
q! => To quit without saving


vi editor also called Visual editor in terms of Unix or Linux or Ubuntu Operating systems. Since all are the same UNIX flavor, and UNIX is the mother of all these operating systems.


Recently many of my friends asked to share some daily use vi editor commands. I am sharing those for your quick reference.

6 Top vi Editor Commands


1. How to Edit a file?

vi filename

This is the first command to use for editing a file.


2. A command to Repeat Previous Command?

Use the UP arrow to repeat the previous command.


3. How to Insert data?

Use insert command to over-type data.


4. How to Save File?

Press Esc
then
:w

5. How to Save and Quit (Exit)?

Press Esc
then
:wq

6 How to quit without Save?

Press Esc
then
:q!

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