Basic iterative statements:
In Python, an "iterative statement" is a programming construct that allows you to execute a block of code repeatedly based on a specified condition or for a predetermined number of iterations. The primary iterative statements in Python are: while loop and the for loop
Now let us look at the while loop.

while loop
The while loop continues to execute a block of code as long as a specified condition is True. It's often used when the number of iterations is not known in advance. Some main uses of while loop includes:
→ Conditionally Repeated Execution: The while loop is a control flow statement that repeatedly executes a block of code as long as a specified condition is True. It is used when you want to repeat an action or a set of actions until a certain condition becomes False.
→ Dynamic Iteration: Unlike the for loop, which is typically used for a known number of iterations, the while loop is used when the number of iterations is not known in advance. It allows you to create loops that continue as long as a specific condition remains true, making it suitable for situations where the termination point depends on runtime conditions.
Now, let us look at the flowchart and the syntax of while loop:

The while loop is a powerful construct for creating dynamic, condition-based loops in Python, and it's essential for scenarios where you need to repeatedly perform tasks until a specific condition is met. However, you should be cautious when using while loops to ensure that the loop eventually terminates, or you may end up with an infinite loop.

# basic loop structures or iterative statements

# while loop

'''
syntax: 
    statement x
    while (condition):
        statement block
    statement y  
'''

# Example 1:
# i = 0
# while(i<100):
#     print(i, end=" ")
#     i = i+1

# Example 2
i = 0
sumN = 0
user_input = int(input("Enter a number: "))
while i <= user_input:
    sumN = sumN + i
    i = i + 1
print(f'The sum of fist {user_input} is', sumN)