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<h3>Python While Loop</h3>

<p>With the while loop we can execute a set of statements as long as a condition is true.<br>

<strong>Syntax:</strong></p>

<pre><code>

while condition: ​

&lt;indented statement 1&gt; ​

&lt;indented statement 2&gt;

... ​

&lt;indented statement n&gt;

&lt;non-indented statement 1&gt;

&lt;non-indented statement 2&gt;

</code></pre>

<p> <strong>Some Important Points:</strong>​<br>

First the condition is evaluated. If the condition is true then statements in the while block is executed.<br> ​

​

After executing statements in the while block the condition is checked again and if it is still true, then the statements inside the while block is executed again. ​<br>

​

The statements inside the while block will keep executing until the condition is true. ​<br>

​

Each execution of the loop body is known as iteration.​<br>

​

When the condition becomes false loop terminates and program control comes out of the while loop to begin the execution of statement following it.​<br></p>

<p><strong>Example:</strong></p>​

<code>

i=1​

while i<=10:​

print(i)​

i=i+1​

print("done!")

</code>

​

<p><strong>Output:</strong></p>​

<code>

1

2

3

4

5

6

7

8

9

10

done!

</code>

<p><strong>Example:</strong></p>​

<code>

i=1​

while i<=10:​

print(i)​

i=i+1​

print("done!")

</code>

<p><strong>Output:</strong></p>​

<code>

1

1

1

1

1

1

1

1

.

.

.

</code>

<h3>Another form of while loop</h3>​

<p>In Python , just like we have an else with if , similarly we also can have an else part with the while loop.​

<br>The statements in the else part are executed, when the condition is not fulfilled anymore. </p>

<strong>Syntax:</strong></p>

<code>

while condition: ​

&lt;indented statement 1&gt; ​

&lt;indented statement 2&gt; ​

... ​

&lt;indented statement n&gt; ​

else:​

&lt;indented statement 1&gt; ​

&lt;indented statement 2&gt;

​ </code>

<p> <strong>Some Important Points:</strong>​<br>

Many programmer’s have a doubt that If the statements of the additional else part were placed right after the while loop without an else, they would have been executed anyway, wouldn't they.<br> ​

​

Then what is the use of else ​<br>

​

To understand this , we need to understand the break statement. Our next tutorial is on Break and Continue statement and will help you understand this concept. ​

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