Featured Post
Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1 1 1 1 1 1 1 1 3 3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2, CASE WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A
How to Delete an Item from a Set in Python: Best Example
- Get link
- Other Apps
Set is a built-in data type in Python. Furthermore, it is an unordered collection without duplicate items. Here are the two methods that explain to delete an item from a Set.
Methods to delete an item from a Set
- discard
- remove
Discrd Vs. Remove
- discard() will not raise an error if the item to remove does not exist.
- The remove() will raise an error if the item does not exist.
Explanation to discard and remove methods
Python program:
#Prints all the Set items
food = {"pasta", "burger", "hot dog", "pizza"}
print(food)
# Prints the Set items without pasta
food.discard("pasta")
print(food)
# Prints the Set items without burger and pasta
food.remove("burger")
print(food)
# The next two lines try to remove an item that isn't in the set!
food.discard("pasta") # this will not report an error
food.remove("pasta") # this will report an error
The output:
{'pasta', 'burger', 'pizza', 'hot dog'}
{'burger', 'pizza', 'hot dog'}
{'pizza', 'hot dog'}
Traceback (most recent call last):
File "main.py", line 12, in <module>
food.remove("pasta") # this will report an error
KeyError: 'pasta'
** Process exited - Return Code: 1 **
Press Enter to exit terminal
Related
- Get link
- Other Apps
Popular posts from this blog
How to Fix datetime Import Error in Python Quickly
Here's a quick resolution for import datetime Python error . The reason is your .py python script name and datetime are the same. I'll show you how this error happens and its resolution. Here's the Resolution for ImportError I've created a script called 'datetime.py.' to check whether the minute value is 'odd' or not. During the import of my python script, I got the import error cannot import name datetime. My Script: datetime.py My script's intention is to find whether the minute value is odd or not. Python Logic from datetime import datetime odds = [ 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 , 21 , 23 , 25 , 27 , 29 , 31 , 33 , 35 , 37 , 39 , 41 , 43 , 45 , 47 , 49 , 51 , 53 , 55 , 57 , 59 ] right_this_minute = datetime.today().minute if right_this_minute in odds: print ( "This minute seems a little odd." ) else : print ( "Not an odd minute." ) ImportError I have imported my datetime.py from Linux. It gives an error
Explained Ideal Structure of Python Class
When you are designing a class, you need to ensure that the classification of its critical parts is outlined at the beginning. The clearer the initial design, the more performant and scalable the class is. Some of the components in the order in which they should be defined in the class are mentioned as follows. Ideal structure of a class Class variables Constants or default variables are usually defined at the top of the class. For someone who is reading the code, it comes as an easy-to-view consolidated list, and for the interpreter it ensures that all such variables are processed before diving into the main logic of the class, including any other Instance method or constructor. The __init__ method The __init__ method provides information about inputs needed and how to instantiate the class. It is also the constructor of the class, which the very first method called while initializing the class . Special Python methods These methods change the functionality of the class or provide add
How to Check Kafka Available Brokers
Here's the command to check the list of brokers present in a Kafka Cluster. You can say the Broker is the heart of the Kafka cluster. In simple terms, it works as a process. The main function is to receive messages from publishers and gives permission to access messages by consumers. How to Check Available Brokers in Kafka Here is the command: linux$ ./zookeeper-shell.sh zookeeper-IPaddress:2181 | "ls /brokers/ids" Just use the above command to get the number of brokers present in your host (Kafka Cluster). What is Default Broker-id in Kafka The default broker id is -1 . When you create a new broker, it adds to -1. Then, it gives a new broker id. The broker ids will be generated from reserved.broker.max.id + 1. Types of broker ids. Use assigned Zookeeper generated broker id. According to Wiki: Kafka runs on a cluster of one or more servers (called brokers), and the partitions of all topics are distributed across the cluster nodes. Additionally, partitions are replicat
Comments
Post a Comment
Thanks for your message. We will get back you.