[Tutor] Need Explanation...

[sunil tech]

*hi,*
*
*
*Consider a list: a = [1,2,3]*
*
*
*& a simple function, which when called it will append 100 to the list.*
*
*
*def app(x):*
*     return x.append(100)*
*
*
*p = app(a)*
*
*
*now list holds appended value [1,2,3,100]*
*but p is empty... why it is?*
*
*
*please teach.*
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