The while loop repeats a block of code as long as a specified condition is True. It is useful when the number of iterations is not known in advance.

# Example of a While Loop
count = 0
while count < 5:
    print("Count is:", count)
    count += 1

Output:

Count is: 0
Count is: 1
Count is: 2
Count is: 3
Count is: 4

In this example, the loop continues to execute as long as count is less than 5. The count variable is incremented by 1 in each iteration.

The for loop is used to iterate over a sequence (such as a list, tuple, dictionary, string, or range). It is ideal when the number of iterations is known or when iterating over elements of a collection.

# Example of a For Loop
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print("I love", fruit)

Output:

I love apple
I love banana
I love cherry

In this example, the for loop iterates over each item in the fruits list and prints a statement for each fruit.

A nested loop is a loop inside another loop. This is useful for working with multi-dimensional data structures or performing repetitive tasks within repetitive tasks.

# Example of Nested Loops
for i in range(3):
    for j in range(2):
        print(f"i = {i}, j = {j}")

Output:

i = 0, j = 0
i = 0, j = 1
i = 1, j = 0
i = 1, j = 1
i = 2, j = 0
i = 2, j = 1

Here, the outer loop runs 3 times, and for each iteration of the outer loop, the inner loop runs 2 times.

The break statement is used to exit the loop immediately when a certain condition is met. It is often used to stop the loop prematurely.

# Example of Break Statement
for num in range(10):
    if num == 5:
        break
    print("Number:", num)

Output:

Number: 0
Number: 1
Number: 2
Number: 3
Number: 4

In this example, the loop stops executing when num equals 5.

The continue statement skips the remaining code inside the loop for the current iteration and moves to the next iteration.

# Example of Continue Statement
for num in range(5):
    if num == 2:
        continue
    print("Number:", num)

Output:

Number: 0
Number: 1
Number: 3
Number: 4

Here, the loop skips printing when num equals 2.

The pass statement is a placeholder that does nothing. It is used when a statement is syntactically required but no action is needed.

# Example of Pass Statement
for num in range(3):
    if num == 1:
        pass  # Do nothing
    print("Number:", num)

Output:

Number: 0
Number: 1
Number: 2

In this example, the pass statement is used as a placeholder when num equals 1.