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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:
<indented statement 1>
<indented statement 2>
...
<indented statement n>
<non-indented statement 1>
<non-indented statement 2>
</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>
<pre>
<code>
i=1
while i<=10:
print(i)
i=i+1
print("done!")
</code>
</pre>
<p><strong>Output:</strong></p>
<pre>
<code>
1
2
3
4
5
6
7
8
9
10
done!
</code>
</pre>
<p><strong>Example:</strong></p>
<pre>
<code>
i=1
while i<=10:
print(i)
i=i+1
print("done!")
</code>
</pre>
<p><strong>Output:</strong></p>
<pre>
<code>
1
1
1
1
1
1
1
1
.
.
.
</code>
</pre>
<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>
<pre>
<code>
while condition:
<indented statement 1>
<indented statement 2>
...
<indented statement n>
else:
<indented statement 1>
<indented statement 2>
</code>
</pre>
<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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