Skip to main content

Loop Statements


Loop STATEMENTS
The Loop statements allow a set of instructions to be performed repeatedly until a certain condition is fulfilled. The iteration statements are also called loops or looping statements.


THE FOR LOOP
The for loop is the easiest to understand of the python loops.

Syntax:

For I in range(lowerlimit,upperlimit):

Loop Body
The program will run until I value becomes equal to upperlimit – 1.
Example:
For I in range(1,5):
Print(“Hello”)

This program will print Hello 4 times, ie from 1 to 4 (upper limit-1) 
I value will start as 1 then loop body will get executed and I value will be incremented. This keeps on taking place until I ==upper limit-1 . After that
the program comes out of loop body.

THE WHILE LOOP

The second loop available in python is the while loop. The while loop is an entry controlled loop.
The syntax of a while loop is
while (expression):
Loop-body
Where loop body keep on getting executed until the expression becomes false. When the expression becomes false, the program control passes to
the line after the loop-body code.
When to use FOR LOOP? 
FOR LOOP is appropriate when you know in advance how many times loops will be executed
When to use WHILE LOOP?
WHILE loop should be preferred when you don’t know how many times
the loop will be executed.

Download Python Learning app from APK Monster Z
Labels:

Comments

Post a Comment

Popular posts from this blog

Conditional Statements

Conditional STATEMENTS Normally, the statements are executed sequentially as written in the program (i.e. Top to bottom). This is known as the normal flow of control. But sometimes the operational flow of control has to be altered depending upon a condition. The statements that allow to do so, are known as selection statements. Most important selection statement that python offers is the If statement. Selection statements are also known as conditional statements or decision statements. THE IF STATEMENT An if statement tests a particular condition; if the condition evaluates to true, a course of action is followed i.e. a statement of a set of statements is executed. If the condition is false the course of action is ignored. The syntax of if statement is as shown below: if (expression) : Statement THE ELIF STATEMENT In some cases the program requires you to write multiple if statements. This results in many condition evaluations thus slowing up the program. So to avoid th...
Post a Comment
Read more

Learning Python Basics

                           Python Basics What is VARIABLES in Python? As the name implies the meaning, a variable is something which can be change. A variable is a way of referring to a memory location used by a computer program. A variable is a symbolic name for this physical location. This memory location contains values, like numbers,text or more complicated types. Variables can be treated as a container which can store some value in it. In any other languages for example C++, This is how you write a variable int a = 20 Where int is data type of the variable. Int stands for integer. String refers to text or collection of characters. It is represented in single quotes or double quotes. Float refers to decimal point numbers. In Programming languages like C++ you have to specify the data type of a variable. But in python you don’t have to worry about data type. Whatever value  you give the variable, py...
Post a Comment
Read more