Python

1: Print Function
2: Escape Sequence
3: Comments
4: Escape Sequence as Normal Text
5: Print Emoji
6: Python as Calculator
7: Strings Concatenation
8: Input
9: int function
10: Variables
11: String Formatting
12: String Indexing
13: String Slicing
14: Step Argument
15: Some useful function and methods
16: Strip Method
17: Find and Replace method
18: Center method
19: If Statement
20: If else statement
21: Nested if-else Statement
22: if-elif-else statement
23: while loop
23.1: Example 1 while loop
23.2: Example 2 while loop
23.3: Example 3 while loop
24: Infinite loop
25: for loop
25.1: Example 1 for loop
26: break and continue statement
27: for loop with string

Chapter 25.1: Example 1 for loop

# sum of numbers using for loop
num = int(input("Enter number to print sum of natural number: "))
sum = 0
for i in range (1, num+1):  # used num + 1 to take the last number
    sum += i
print(f"Sum of {num} natural numbers is {sum}.")
Output:
Enter number to print sum of natural number: 10
Sum of 10 natural number is 55.