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<h3>Python Recursive functions</h3>
<hr>
<h4>Recursion</h4>
<p>
Python also accepts function recursion, which means a defined function can call itself. <br>
Recursion is a common mathematical and programming concept. It means that a function calls itself. This has the benefit of meaning that you can loop through data to reach a result. <br>
The developer should be very careful with recursion as it can be quite easy to slip into writing a function which never terminates, or one that uses excess amounts of memory or processor power. However, when written correctly recursion can be a very efficient and mathematically-elegant approach to programming. <br>
In this example, tri_recursion() is a function that we have defined to call itself ("recurse"). We use the k variable as the data, which decrements (-1) every time we recurse. The recursion ends when the condition is not greater than 0 (i.e. when it is 0). <br>
To a new developer it can take some time to work out how exactly this works, best way to find out is by testing and modifying it. <br>
<b>Example:</b>
<pre><code>
def tri_recursion(k):
if(k > 0):
result = k + tri_recursion(k - 1)
print(result)
else:
result = 0
return result
print("\n\nRecursion Example Results")
tri_recursion(6)
</code></pre>
<b>Output:</b>
<pre><code>
Recursion Example Results
1
3
6
10
15
21
</code></pre>
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