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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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How to Write ETL Logic in Python: Sample Code to Practice

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Here's an example Python code that uses the mysql-connector library to connect to a MySQL database, extract data from a table, transform it, and load it as a JSON file. Here's an example: Python ETL Sample Code import mysql.connector import json # Connect to the MySQL database cnx = mysql.connector.connect(user='username', password='password',                               host='localhost',                               database='database_name') # Define a cursor to execute SQL queries cursor = cnx.cursor() # Define the SQL query to extract data query = ("SELECT column1, column2, column3 FROM table_name") # Execute the SQL query cursor.execute(query) # Fetch all rows from the result set rows = cursor.fetchall() # Transform the rows into a list of dictionaries result = [] for row in rows:     result.append({'column1': row[0], 'column2': row[1], 'column3': row[2]}) # Save the result as a JSON file with open('ou
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Python: How to Write Logic to Print Triangle

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Here's an example to print Triangle in Python. It's the best interview question. You can expect this type of question in your interview. So this is useful to practice it. How to Print Triangle Logic to Print Trianagle max = 8 for x in range(1, max + 1): for y in range(1, x + 1): print y, print Result 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8   Also, Read Python while loop Python for loop example
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