For Loops

Python for loop¶

Here us the syntax

for

item

in

sequence:

Break, continue, and pass are control flow statements in Python that are used to change the behavior of loops (and in the case of pass, to do nothing).

Here's a short explanation of each item:

Break¶

break: Terminates the loop completely and transfers control to the first statement after the loop.
```
for number in range(10):
    if number == 5:
        break
    print(number)
```
This loop will print numbers 0 to 4 and then stop.

Continue¶

continue: Skips the rest of the code inside the current loop iteration and moves to the next iteration of the loop.
```
for number in range(10):
    if number % 2 == 0:
        continue
    print(number)
```
This loop will print all odd numbers between 0 and 9.

Pass¶

pass: Does nothing and is used as a placeholder in loops, function definitions, or conditionals where syntactically some code is required but no action is needed.
```
for number in range(10):
    if number < 5:
        pass  # Placeholder for future code
    else:
        print(number)
```
This loop will print numbers 5 to 9, doing nothing for numbers less than 5.

Else¶

else (used with loops): Executes when the loop completes normally (i.e., not terminated by a break statement).
```
for number in range(5):
    print(number)
else:
    print("Loop completed without break")
```
This will print numbers 0 to 4 and then "Loop completed without break".

Continue vs Break vs Pass¶

continue: Skips to the next iteration of the loop.
break: Exits the loop immediately.
pass: Does nothing, acts as a placeholder.

For loops Examples¶

Code Examples	Code Examples
# Print "Access Denied" 5 times for _ in range(5): print("Access Denied")	# Using list comprehension for conditional operations numbers = [1, 2, 3, 4, 5, 6] even_numbers = [num for num in numbers if num % 2 == 0] print(even_numbers) # Output: [2, 4, 6]
# Using enumerate to get index and value fruits = ["apple", "banana", "cherry"] for index, fruit in enumerate(fruits): print(f"{index}: {fruit}")	# Using zip to iterate over two lists names = ["Alice", "Bob", "Charlie"] scores = [85, 90, 95] for name, score in zip(names, scores): print(f"{name} scored {score}")
# Using a dictionary in a for loop user_info = {"name": "Alice", "age": 25, "city": "New York"} for key, value in user_info.items(): print(f"{key}: {value}")	# Nested loops to print a multiplication table for i in range(1, 6): for j in range(1, 6): print(f"{i} x {j} = {i * j}") print()
# Using the range function with a step for i in range(0, 20, 5): print(i)	# Using a set in a for loop unique_numbers = {1, 2, 3, 4, 5} for num in unique_numbers: print(num)
# Using a for loop with else numbers = [1, 2, 3, 4, 5] for number in numbers: if number == 3: print("Found 3!") break else: print("3 not found")	# Using a generator expression in a for loop squares = (x * x for x in range(10)) for square in squares: print(square)