Loops in Python
Hey there! In this guide, we'll explore loops in Python. Loops are used to execute a block of code repeatedly based on a condition. Let's dive in!
Python Loops
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Loops allow you to repeatedly execute a block of code while certain conditions are true.
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Python provides two primary types of loops:
forloops andwhileloops.
Video Explanation
1. For Loop
The for loop in Python is used to iterate over a sequence (like a list, tuple, or string) and execute a block of code for each element.
numbers = [1, 2, 3, 4, 5] # List of numbers to iterate over
for num in numbers: # Begin a 'for' loop over the 'numbers' list
print(num) # Print each number in the list
2. For Loop with Range
You can also use the range() function to iterate over a sequence of numbers, especially when you want to loop for a specific number of times.
for i in range(1, 6): # Loop through numbers from 1 to 5 (range excludes 6)
print(i) # Print each number in the range
3. While Loop
The while loop in Python allows you to execute a block of code as long as a condition is true.
count = 1 # Initialize a variable 'count' with value 1
while count <= 5: # Continue looping while 'count' is less than or equal to 5
print(count) # Print the current value of 'count'
count += 1 # Increment 'count' by 1 in each iteration
4. Break Statement
The break statement is used to exit a loop prematurely, even if the loop condition is still true.
for num in range(1, 11): # Loop through numbers 1 to 10
if num == 5: # Check if 'num' equals 5
break # Exit the loop when 'num' is 5
print(num) # Print numbers from 1 to 4
5. Continue Statement
The continue statement skips the current iteration of the loop and moves to the next iteration.
for num in range(1, 6): # Loop through numbers from 1 to 5
if num == 3: # Check if 'num' equals 3
continue # Skip the current iteration when 'num' is 3
print(num) # Print numbers except 3
6. Nested Loops
In Python, you can use loops inside other loops. These are called nested loops and are useful for iterating over multi-dimensional data structures.
for i in range(1, 4): # Outer loop from 1 to 3
for j in range(1, 3): # Inner loop from 1 to 2
print(f'Outer: {i}, Inner: {j}') # Print values of outer and inner loops
7. Loop Else Clause
Python also provides an else clause that can be used with loops. The block under else is executed if the loop completes without hitting a break statement.
for num in range(1, 4): # Loop through numbers from 1 to 3
print(num) # Print the current value of 'num'
else: # Execute after the loop ends
print('Loop completed successfully.') # Print a success message
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