String length without len function

Question

Can anyone tell me how can I get the length of a string without using the len() function or any string methods. Please anyone tell me as I\'m tapping my head ma

Answer 1

>>> sum(map(lambda x:1, "hello world"))
11

>>> sum(1 for x in "foobar")
6

>>> from itertools import count
>>> zip(count(1), "baz")[-1][0]
3

A "tongue twister"

>>> sum(not out not in out for out in "shake it all about")
18

some recursive solutions

>>> def get_string_length(s):
...     return 1 + get_string_length(s[1:]) if s else 0
... 
>>> get_string_length("hello world")
11
>>> def get_string_length_gen(s):
...     yield 1 + next(get_string_length_gen(s[1:])) if s else 0
... 
>>> next(get_string_length_gen("hello world"))
11
>>> 

Answer 2

Here's a method which isn't using neither len nor iteration:

>>> a = 'a' * 200000
>>> a.rindex(a[-1]) + 1
200000

To make it work for lists, which don't have rindex, use:

>>> a = list(range(200000))
>>> a.index(a[-1], -1) + 1
200000

Answer 3

Why you need to avoid the len function is beyond me, but strings are iterables. You should be able to do this:

strlen = 0

for c in myString:
  strlen += 1

Answer 4

You can get the length of the string with a for loop.

For example, instead of:

string=input("Enter a string")
print(len(string))

Do this:

string=input("Enter a string")
a=0
for letter in string:
  a=a+1
print(a)

Answer 5

It's a weird question so here's a weird answer!

try:
  for i in itertools.count(): mystring[i]
except IndexError:
  pass

Answer 6

Try doing this, its pretty simple and easy

def calculate_length(a):
    x=0
    for i in a:
       x+=1
    print(x)