For Loop is used to iterate a task number of times. The loop allows traversal over an iterable objects like lists, tuple and strings.
Syntax:
>>> for val in sequence :
. . . body of for
>>> else:
. . . body of else part
here val is a variable that takes values from the sequence. On each iteration val takes one value from the sequence of iterable object till all items are exhausted.
Flowchart of a Loop Process in Python

LOOP