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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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Python 'getsizeof' Command the Real Purpose

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Here's a sample python program to get the size of a List array.  Getting the number of elements present in a List is not easy. So how to get this? To do you need the 'getsizeof' command.

Import 'sys' Library.

You need to import the 'sys' library to use the SIZE commands. 

>>> import sys

Congrats to you since you have now imported the SYS library. The command name is "getsizeof".

Check the below example.

print("An Integer:")
i = int(100)
print(sys.getsizeof(i))

The result will be: 100

What is the size command?  - is to get the size of elements. It gives the result based on the object you are being used. Suppose, if you use Strings, you will get String length.

Python Command to get the Size of an Object


How to use the 'getsizeof' command?

Example:1

print("Empty string:")
empty_string = ""
print(sys.getsizeof(empty_string))

Example:2

print("A normal string")
s = "Hello world"
print(sys.getsizeof(s))

Example:3

print("Increasing string:")
for i in range(0,5):
empty_string = empty_string + chr(i)
print(sys.getsizeof(empty_string))

Sources

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