Length of string using Recursion

Finding Out Length  of  a String Is very easy task . you can directly use inbuilt function like strlen() or len() . 
But if there is restriction to not use these function then how find length of a string .

Length Using Loop : count number of element using for loop or while loop

1. # Using For LOOP
2. count=0
3. st='http://beginer2cs.blogspot.com'
4. for ch in st:
5.     count +=1
6. print count

Length Using While LOOP :-

1. # Using While Loop
2. count=0
3. st='http://beginer2cs.blogspot.com'
4. while True:
5.     try: #to check Index out of range then break
6.         if st[count]:
7.             count +=1
8.     except:
9.         break
10. print count

These two technique are very easy . But can you do it using Recursion (Try once)

Find length of string using Recursion :-

1. def lenRecur(aStr):
2.     '''
3.      Recursive Way to Find Length of string
4.    '''
5.     if aStr == "":
6.         return 0
7.     else:
8.         return 1+lenRecur(aStr[0:-1])
9.              #1+ recursive_call(string with size less than current size)
10.              #In this case last char is dropped using slice
11. if __name__=='__main__':
12.     st='http://beginer2cs.blogspot.com/'
13.     print lenRecur(st)

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