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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 User Input Python Sample Programs

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Here are the Python programs that work on taking user input and giving responses to the user. These are also called interactive programs. 


Python enables you to read user input from the command line via the input() function or the raw_input() function. Typically, you assign user input to a variable containing all characters that users enter from the keyboard. User input terminates when users press the <return> key (included with the input characters).


User input programs


#1 User input sample program


The following program takes input and replies if the given input value is a string or number.


my_input = input("Enter something: ") 
try: 
    x = 0 + eval(my_input) 
    print('You entered the number:', my_input) 
except: 
    print(userInput,'is a string')


Output


Enter something: 

100

You entered the number: 100

** Process exited - Return Code: 0 **

Press Enter to exit terminal. 


#2 User input sample program


The following program takes two inputs from the user and calculates the sum.


sum = 0
msg = 'Enter a number:'
val1 = input(msg)

try:
  sum = sum + eval(val1)
except:
  print(val1,'is a string')

msg = 'Enter a number:'
val2 = input(msg)

try:
  sum = sum + eval(val2)
except:
  print(val2,'is a string')

print('The sum of',val1,'and',val2,'is',sum)


Output

Enter a number:
100
Enter a number:
200
The sum of 100 and 200 is 300


** Process exited - Return Code: 0 **
Press Enter to exit terminal


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