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Python QnA #1

Python QnA for November 14, 2018.




>>>x = input()
User response : [12]

>>>y = int(input('Please enter a number'))
User response : Please enter a number[45]

>>>x + y














# What would be the output??













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Solution Python QnA #1




























 Solution for Python QnA for November 14, 2018.    # OUTPUT******************************************  >>>  x =  input () 12  >>>  y =  int ( input ( 'Please enter a number' )) Please enter a number45 >>>  x + y Traceback (most recent call last):   File "<stdin>" , line 1 , in  < module >  TypeError : must be str , not  int  >>>  y + y 90  >>>  x + x '1212'        In this (x+y); addition of integer and string is not allowed. hence we get the TypeError.   




















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Picking the structure!!




























  Use of arrays, rather sorted arrays or a linked list is somewhat difficult because both have their pros and cons.      Arrays excel when we have to perform a binary search while it’s faster to add and remove elements from linked lists.      A tree is one structure where there is ONLY ONE path to reach to a node. This can be explained further as “Nodes cannot be in closed loop” . Also there is a hierarchical relationship of parent and child.     The average complexity varies from logarithmic to linear time.   Now coming further to a data structure BSTs aka Binary Search Trees . Points to be remembered here:-    Maximum two children.     Left child is smaller than parent.  Right one is greater than parent.          Traversals :-     In order  Traversal   Ascending Sort; left subtree + root+ right subtree. So the above tree will look like:  4, 12, 16, 25, 28, 32     Pre order Traversal   Root + left subtree + right subtree recursively. Eg: 25, 12, 4, 16, 32, 28     Po...




















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Swapping of variables




























  There are a couple of classical ways to do it. Let the variables be:-   a = 5  b = 10   1. By using temporary variable "temp" (name as per your convenience).   temp = a  a = b  b = temp   2. Without "temp" or any extra variable   a = a + b    // 15  b = a - b   // b becomes 5  a = a - b   // a becomes 10   3. In Python like a Boss!! :D  a, b = b, a  




















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