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How to Check Column Nulls and Replace: Pandas

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

How to Write Recursive Shell Script in Bash Terminal

Bash Recursive Function How to Write it Quickly

Here's a simple bash recursive function. To write it, you can use JavaScript and other scripting languages. Below is the example that shows you how to write a recursive function in the bash shell.

Recursive function

Precisely, calling the same function within it is called the Recursive function. We call itself and its contents. 

Moreover, the recursive functions go in the loop due to self-calling. While writing the code, ensure it has a condition that breaks the loop.

Recursive logic

for ((i = 1; i < 65; i++))
{ ((arr[i - 1] = i)) } i = 1;
key = 8

function linear_search {
echo "Element value: ${arr[$i-1]}"
if ((arr[i - 1] == key)) then
echo "Linear search found $key on attempt $i" return 0 => it breaks the loop
else ((i++)) linear_search = > Calling th same script fi
linear_search = > Calling the same script


Here is the dissection of the output. Displayed the array's elements until match-condition occurs. In the end, a display statement tells at which point the condition is satisfied.

Shell script


  • The For Loop's purpose is to get elements one by one
  • The "arr" is a keyword for an Array in bash
  • The i-1 is to calculate an index for the array



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