Python endswith() function, without the built-in function

Question

I need to make the endswith() function without using the built-in function in Python. I wanted to know if there is any way i could do it shorter and easier? I'm sure there is, my way is really complicated.

string = "example for endswith"

find = "endswith"

l = len(find)

final = False

b = 0
tstring =[]
new = "" 
for i in string:
    if find[b] == i:
        tstring.insert(b,i)
        b = b + 1
        if b == l:
            print(tstring)
            break
for x in tstring: 
        new += x

print(new)

if(new==find):
    final = True

print(final)

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So my code works, but i was wondering if there is any easier and more simple way of doing it, which i am sure there is. — Vida, Mar 29 '19 at 15:17

Alfe · Answer 1 · 2019-03-29T15:24:15.317

0

How about this one:

def endswith(a, b):
  for i in range(len(b)):
    if a[-1-i] != b[-1-i]:
      return False
  return True

Here's a recursive implementation, not useful, just for educational purposes:

def endswith(a, b):
  return not b or (b[-1] == a[-1] and endswith(a[:-1], b[:-1]))

Or, of course, without a loop:

def endswith(a, b):
  return a[-len(b):] == b

But I think that wasn't the idea of the task.

edited Mar 29 '19 at 15:24

answered Mar 29 '19 at 15:18

Alfe

56,346
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Thank you very much for the help! :) – Vida Mar 29 '19 at 15:24
1

Welcome to StackOverflow! There's no need to leave thank-you comments. Just upvote an answer when it helped you (upwards triangle left of the answer, that's the simpler equivalent of a thank-you) and/or accept it (checkmark) if it solves your problem. – Alfe Mar 29 '19 at 15:25

score 0 · Answer 2 · answered Mar 29 '19 at 15:34

0

string = "example for endswith"

find = "endswith"

l = len(find)

final = False

print(find[::-1] == string[::-1][:l])

answered Mar 29 '19 at 15:34

Saya

323
2
6

I recommend not using variables names `l`, `O` or `I`. depending on the font they look a lot like `1`, `0` and `l` and can lead to a lot of confusion. – Alfe Mar 29 '19 at 16:32
I second Alfe's comment. Generally speaking, try not to use single letter variable names – blueberryfields Mar 29 '19 at 18:29
Please describe, what did you change and why, to help others understand the problem and this answer – FZs Mar 29 '19 at 18:54

Python endswith() function, without the built-in function

2 Answers2