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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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5 Python File Modes You Need

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Here're top five Python file modes explained. The purpose is to open, read, write the files. There are occasions you need to deal with data, which is present in the files. You need to give correct file-modes to handle the files in Python.


Python file modes crucial to handle the files. Here is the list of file modes to use correctly in your program.
Python file open modes

5 Python File Modes You Need


Here's an example code how to you can use file mode:

  
filename = input('Enter a filename : ')
f1 = open(filename, 'mode')


1- Python File mode w 


To open the file for writing, you need 'w' mode. The beauty of this is If the file does not exist, it creates one. This mode's purpose is to write the file. If you try to read, you will get an error.



2- Python File mode w+


To Open the file for Reading and Writing, you need 'w+' mode. For instance, you used w+, you have tried to read the file - after writing, it displays blank. The reason is after writing cursor position will point at the end of the file.


3- Python File mode a


It appends the records at the end of the existing file. The file must exist to use this mode.


4- Python File mode r


To open a file in read-only mode. If the file does not exist, it throws an error.


5- Python File mode r+


Both read and write. When you write the data to the file, it writes at the end. Now, the cursor is at the end of the file. When you perform read, it gives blank.


In the 'r+' mode, if the file does not exist, and if you try to read, which gives an error.


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