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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 Default Argument is Self Why do We Need it

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Python self as default argument, here is the reason. Below, you will find an example and the importance of self-argument.


python self as default argument

Structure of a class

The default argument is self. The self-argument states the function belongs to the class that we refer to here. Access to class members' details of one member to another is possible through self-argument. So self-argument is mandatory.


class <name of the class>:
def <function name>(<arguments>):
...
<members>


Self Argument

A python class consists of methods these also called functions. The default self-argument you need to supply in all the class methods .

Python class with self argument

class employee: 
    def getdata(self): 
         self.name=input('Enter name\t:') 
         self.age=input('Enter age\t:') 
   def putdata(self): 
         print('Name\t:',self.name)
         print('Age\t:',self.age) 

e1=employee() 
e1.getdata() 
e1.putdata()


Python class same code

Output from python class

Here, I have Imported my .py  module to the Python3 shell. It ran automatically. You may get syntax errors while importing, those you need to fix if any.


Here is list of commands to run Python class


References

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