Lesson 6. While loop
1/12. While loop
while loop repeats
the block of statements many times while some condition evaluates to
True. When the condition is evaluated to
False, the block of statements is executed no more, and while loop is ended.
The condition is given before the loop body (before the block of statements) and is checked before each execution of the loop body.
while loop is used when it is impossible or inconvenient
to determine the exact number of loop iterations in advance.
Primarily, Python checks the condition. If it is False, the loop is terminated and the program performs instructions that go after the
If the condition is True, the loop body is executed, and then the condition is checked again. This continues while the condition is True.
Once the condition becomes False, the loop terminates and the program performs instructions that go after the
# while some condition: # a block of statements i = 1 while i <= 5: print(i) i += 1