Which is better for loop or while loop in Python?

I think the answer here is a little more subtle than the other answers suggest, though the gist of it is correct: the for loop is faster because more of the operations happen in C and less in Python.

Do you use a while loop to repeat code?

The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. For example, say we want to know how many times a given number can be divided by 2 before it is less than or equal to 1.

When should you use a while loop over a for loop?

In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.

Is a while loop more efficient than a for loop?

More videos on YouTube Many times it comes down to programmer preference, or is reliant on efficiency. Generally, the for loop can be more efficient than the while loop, but not always. The idea of the While loop is: While something is the case, do the following block of code.

Which loop is better in python?

Using Pure Python We can see that in the case of nested loops, list comprehensions are faster than the ordinary for loops, which are faster than while. In this case, we have 100.000 (100×1.000) integer elements in each list. This example is slightly slower than the one with 100.000 elements and a single loop.

How do you optimize a while loop in Python?

Conclusion

1. Rule number one: only optimize when there is a proven speed bottleneck.
2. Small is beautiful.
3. Use intrinsic operations.
4. Avoid calling functions written in Python in your inner loop.
5. Local variables are faster than globals; if you use a global constant in a loop, copy it to a local variable before the loop.

How do you use a while loop in Python?

Python While Loops

1. ❮ Previous Next ❯
2. Print i as long as i is less than 6: i = 1. while i < 6: print(i)
3. Exit the loop when i is 3: i = 1. while i < 6: print(i)
4. Continue to the next iteration if i is 3: i = 0. while i < 6: i += 1.
5. Print a message once the condition is false: i = 1. while i < 6: print(i)
6. ❮ Previous Next ❯

When would you use a while loop in Python?

Python While Loop is used to execute a block of statements repeatedly until a given condition is satisfied. And when the condition becomes false, the line immediately after the loop in the program is executed. While loop falls under the category of indefinite iteration.

Why while loop is better than for loop?

for loop: for loop provides a concise way of writing the loop structure. Unlike a while loop, a for statement consumes the initialization, condition and increment/decrement in one line thereby providing a shorter, easy to debug structure of looping.

How do you decide which loop to use?

When to Use Each Loop

1. Use a for loop to iterate over an array.
2. Use a for loop when you know the loop should execute n times.
3. Use a while loop for reading a file into a variable.
4. Use a while loop when asking for user input.
5. Use a while loop when the increment value is nonstandard.

Why for loop is better than while?

What is the difference between for and while loop in Python?

In the while loop, the loop update i += 1 happens in Python, whereas in the for loop again the iterator of range (100000000), written in C, does the i+=1 (or ++i ). We can see that it is a combination of both of these things that makes the for loop faster by manually adding them back to see the difference.

How do you loop through a set of numbers in Python?

The range() Function To loop through a set of code a specified number of times, we can use the range() function, The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.

How to repeat an action more than once in Python?

In Python you have two fine ways to repeat some action more than once. One of them is while loop and the other – for loop. So let’s have a look on two simple pieces of code: My question is which of them is better.

How to iterate over a sequence of numbers in Python?

Python range() with for loop. As you know for loop executes a block of code or statement repeatedly for the fixed number of times. Using for loop we can iterate over a sequence of numbers produced by the range() function.