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4 cze 2021 · While Loop. One way is to use a while loop. It is typical to use a while loop if you don’t know exactly how many times the loop should execute. General form: while condition: statement(s) Meaning: as long as the condition remains true, execute the statements.
The for statement is followed by indented statements to be repeated; A loop allows us to operate on each element of a one-dimensional list or array; A pair of nested loops operate on each element of a two-dimensional list or array; A while() statement repeats a loop as long as a condition is satis ed;
In Python programming, we use while loops to do a task a certain number of times repeatedly. The while loop checks a condition and executes the task as long as that condition is satisfied. The loop will stop its execution once the condition becomes not satisfied.
An Example of a. forLoop. Note an important difference between the while loop and the for loop. In the while loop, the index variable iis assigned 0, 1, and so on. In the for loop, the element variable is assigned stateName[0], stateName[1], and so on. stateName = "Virginia".
In Python a for-loop is used to step through a sequence e.g., count through a series of numbers or step through the lines in a file. Syntax: for <name of loop control> in <something that can be iterated>: body. Program name: total = 0. for i in range (1, 4, 1): Initialize control.
Loops in Python V22.0002-001 Summary • Loops provide a way to repeat blocks of instructions • While loops are the most general –They require a condition for exiting the loop •If the condition is never true, the loop is endless • For loops provide a simple way of repeating a block –once for each element in a sequence
Quite often we have a list of items of the lines in a file - effectively a finite set of things. We can write a loop to run the loop once for each of the items in a set using the Python for construct. These loops are called "definite loops" because they execute an exact number of times.
