In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on. There may be a situation when you need to execute a block of code several number of times.
Programming languages provide various control structures that allow for more complicated execution paths.
A loop statement allows us to execute a statement or group of statements multiple times. The following diagram illustrates a loop statement −
Python programming language provides following types of loops to handle looping requirements.
|Repeats a statement or group of statements while a given condition is TRUE. It tests the condition before executing the loop body.|
|Executes a sequence of statements multiple times and abbreviates the code that manages the loop variable.|
|You can use one or more loop inside any another while, for or do..while loop.|
Loop Control Statements
Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.
Python supports the following control statements. Click the following links to check their detail.
|Terminates the loop statement and transfers execution to the statement immediately following the loop.|
|Causes the loop to skip the remainder of its body and immediately retest its condition prior to reiterating.|
|The pass statement in Python is used when a statement is required syntactically but you do not want any command or code to execute.|
Let us go through the loop control statements briefly −