# Binary Search Program in Python

Binary Search program in Python- In this program, at first, we will input few element. After that program search for a given element using Binary search. If the list is finds a elements matched then it shows Element present. This python project is useful for beginners and CBSE KV School Class 11 and Class 12 students computer science practical file and NIELIT O Level module.

Objective– WAP to input a list of integers and search for a given number using binary search

### Explanation of python code->

def bsearch(L,n):#a function is being declaring taking values one for entering the list of number and the number to find n
start=0 #in this declaration we take a variable start=0
end=len(L)-1 #in the end
while start<=end: #Condition for while loop
mid=(start+end)//2 #the mid
if L[mid]==n: #now middle number between start and end is checked whether it is equal to the mid number
return True
elif L[mid]<=n: #if this condition is true then the below line works
start=mid+1
else: #else the below will be doing
end=mid-1
else:
return False
L=eval(input(“Enter the list of numbers”)) #the list is entering
n=int(input(“Enter the number to find”)) #the number to find
L.sort() #sorted the list and stored in L itself
if bsearch(L,n): # the above program is called with the sorted list and n number to be finding
print(“Element found”)
else:

### Testing of Python Program

Case 1

Input of the program is 15,16,17,18,19.
Element to be Search 5

Case 2

Input of the program is 5, 15, 16,17,18
Element to be Search 5
Element is found in the list after sorting,
Therefore out put is – Element found

Well done . Our Binary Search Program using Python language is working fine.

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