Python For Loop: Question and Answers

The for loop is a simple programming construct that repeats a statement or group of statements. In these questions, we look at the syntax and structure of the for loop in Python.

1. What is the difference between a for loop and a while loop?

A for loop is typically used when you know exactly how many times the loop needs to be repeated. A while loop is typically used when you don't know how many times the loop needs to be repeated.

A while loop repeats as long as its condition is true. For example, if a while loop says "while x == 5", then the line will execute as long as x equals five.

2. What is the Python syntax for a for loop?

The for loop is a programming construct that allows you to iterate over an arbitrary range of values, mapping them to the required actions.

It can be thought of as an extension of the mathematical notion of a for loop, which is defined as "a control structure that enables one to iterate (repeat) a process (such as counting or summing) while varying the process's start value (or its end point), step size, and/or direction."

- The syntax for Python for loops is:

for x in range(y): do something

3. What are the advantages of using a for loop in Python?

A for loop is a type of loop that executes a set of instructions repeatedly. It uses the following syntax: for x in range(y): do something

This type of loop has the following properties:

  • For loops are good because they can make your code more readable and easier to follow.
  • They also make sure that certain instructions are executed at least one time.

4. What are the disadvantages of using a for loop in Python?

The for-loop is one of the most basic constructs in programming. However, this construct has its own disadvantages.

  1. If you don't know the upper-bound of your loop, you have to keep track of it by hand or break out of your loop early.
  2. You can't use a break statement to escape from a nested loop.

5. How can I use a break statement in my Python for loops?

A break statement can be used to terminate a loop. It is often used when the programmer needs to stop iterating through the data and instead go back to checking for other conditions.

An example of such a situation is when we need to break out of a for loop if an exception occurs. This will allow us to take different paths depending on whether or not we want to handle that exception, or ignore it and continue with whatever else follows after the for-loop.

Code Example for Break Statement is as follows:

 animals = ["dog","cat","sheep","tiger","lion"]

 for x in animals:

 print (x)

 if x == "tiger":

 break;

To prepare for the Python interview, why not try our MCQ on python programming and other programming interview questions? All the best for your technical interview!

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