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Python: Built-in Functions vs. For & If Loops – 5 Programs Explained

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Python’s built-in functions make coding fast and efficient. But understanding how they work under the hood is crucial to mastering Python. This post shows five Python tasks, each implemented in two ways: Using built-in functions Using for loops and if statements ✅ 1. Sum of a List ✅ Using Built-in Function: numbers = [ 10 , 20 , 30 , 40 ] total = sum (numbers) print ( "Sum:" , total) 🔁 Using For Loop: numbers = [ 10 , 20 , 30 , 40 ] total = 0 for num in numbers: total += num print ( "Sum:" , total) ✅ 2. Find Maximum Value ✅ Using Built-in Function: values = [ 3 , 18 , 7 , 24 , 11 ] maximum = max (values) print ( "Max:" , maximum) 🔁 Using For and If: values = [ 3 , 18 , 7 , 24 , 11 ] maximum = values[ 0 ] for val in values: if val > maximum: maximum = val print ( "Max:" , maximum) ✅ 3. Count Vowels in a String ✅ Using Built-ins: text = "hello world" vowel_count = sum ( 1 for ch in text if ch i...
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2 Exclusive Ways to Start Kafka Services

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The Kafka services start or stop you can do in two ways. Those are Systemd and Systemctl (sudo user). Below, you will find the commands for these two methods.


2 Ways to start Kafka Services


How to start/stop Kafka service

Here are exclusive ways. With these, you can start or stop Kafka services.  

1. Systemd service

The concept of unit files people who worked on Linux servers have familiarity with it. Also, they know creating the unit file to use by systemd.

To summarize, it initializes and maintains components throughout the system. This means that you can define ZooKeeper and Kafka as unit files, which then will be used by systems.


Commands

The first command starts the service, and the second command stops the service.

... [Service] ...

ExecStart=/opt/kafkainaction/bin/zookeeper-server-start.sh
ExecStop= /opt/kafkainaction/bin/zookeeper-server-stop.sh


2. Systemctl by Sudo (root) user

The root user can start or stop the Kafka services. This is more like front-end processing. This way of executing is called systemctl.

Commands

The first command starts the Zookeeper and the second one starts Kafka.

$sudo systemctl start zookeeper
$sudo systemctl start kafka

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