1.4. Looping Statements

Looping Statements Used to repeat a block of code.

Looping statements are commands in programming that allow you to repeat a sequence of instructions multiple times. They are essential because they enable automation of repetitive tasks within your code, saving time and reducing the amount of code you need to write.

Think of looping statements as a recipe that requires you to stir a pot every 5 minutes. Instead of writing down 'stir the pot' multiple times, you can say, 'every 5 minutes, stir the pot'—this is similar to how a loop works in programming.

for Loop: Used when the number of iterations is known.

for i in range(5):
    print(i)

A 'for' loop is a type of looping statement in Python specifically used when you know how many times you want to repeat a block of code. For instance, in the example code, the command 'range(5)' generates a sequence of numbers from 0 to 4. The loop iterates through each of these numbers, executing the block of code inside it (in this case, printing each number).

Imagine you're counting your steps as you walk. If you decide to walk for 5 minutes, you can think of each minute as one iteration of the loop. You check the time after each minute and take one step forward—this is similar to how a for loop progresses through a known set of iterations.

while Loop: Used when the number of iterations is unknown and depends on a condition.

while condition:
    # code block

A 'while' loop is different from a 'for' loop because it continues to execute as long as a specific condition remains true. You may not know how many times the loop will run, as it depends on the evaluation of the condition. Once the condition becomes false, the loop stops running, allowing your program to continue past the loop.

Consider waiting for a bus. You keep checking if the bus has arrived. The check is your 'while' condition—'while the bus isn’t here, keep waiting.' You continue to wait until the bus arrives, and only then do you leave the bus stop.

1.5 Break and Continue Statements • break: Terminates the loop immediately. • continue: Skips the current iteration and continues with the next one. Example:

for i in range(5):
    if i == 3:
        break
    print(i)

The 'break' statement is used to end a loop prematurely when a certain condition is met. In the example, when the variable 'i' equals 3, the loop is terminated, so numbers 0, 1, and 2 are printed, but not 3 or any subsequent numbers. The 'continue' statement, on the other hand, skips the current iteration and continues with the next one, allowing the loop to continue without executing any remaining code in its current cycle.

Think of the 'break' statement as a traffic signal. If the signal turns red (the condition is met), you must stop (the loop ends). The 'continue' statement can be compared to a situation where you decide to skip a few stops on your bus route—if you don’t want to get off at a particular stop, you choose to stay on and continue to the next stop.

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