Day 4: Loops (for and while loops)

Welcome back to our Python learning journey! Today, we're going to dive into loops. Loops are a fundamental concept in programming that allow us to execute a block of code repeatedly. There are two main types of loops in Python: for loops and while loops. We'll explore both types and learn how to leverage them effectively.

For loop

for loops are used when you have a block of code which you want to repeat a fixed number of times. They are commonly used for iterating over sequences like lists, tuples, or strings.

#Iterating over a string
for x in "panda":
  print(x)

#Using the range() function
for i in range(5):
    print(i)

In first case, we're printing each character of the string "panda", one by one, on a separate line.

range() is a built-in Python function that generates a sequence of numbers from 0 up to, but not including, 5. So, range(5) produces the sequence [0, 1, 2, 3, 4]. for each number in the sequence generated by range(5) And in this case, we're printing each number from 0 to 4 on separate lines.

#output
p
a
n
d
a

While Loops

while loops are used when you want to execute a block of code as long as a condition is true. Careful with while loops, as they can potentially result in infinite loops if not used properly.

num = 1
while num <= 3:
    print(num)
    num = num + 1
#output
1
2
3

here we used a while loop to print the numbers from 1 to 3. The loop runs as long as the condition num <= 3 is satisfied.

Loop Control : Python provides loop control statements like break, continue, and pass to modify the execution of loops.

break: Terminates the loop prematurely.
continue: Skips the rest of the loop's code for the current iteration and proceeds to the next iteration.
pass: Acts as a placeholder, doing nothing. It is often used when a statement is required syntactically but you don’t want any command or code to execute.
```
  # Using break and continue in a loop
  for i in range(10):
      if i == 5:
          continue  #Skip printing 3
      if i == 8:
          break  #Stop the loop when reaches 7
      print(i)
```
Conclusion:

In conclusion, loops in Python provide a versatile way to repeat tasks and iterate over data structures. Whether it's iterating through a sequence of elements or executing code based on a condition, loops help streamline your code and make it more efficient. By learning loops, you'll have a powerful tool for solving a variety of programming problems.

Stay curious! Happy coding <3

Day 4: Loops (for and while loops)

Table of contents

For loop

While Loops

Conclusion: