Python 3 weird len function behavior

Asked Aug 09 '20 at 15:37

Active Aug 10 '20 at 03:14

Viewed 84 times

I have the following code

for i in range(500):
 if(len(chr(i).upper())==2):
  print(chr(i))

surprisingly this print some characters on the screen, while this code does not

for i in range(500):
 if(len(chr(i))==2):
  print(chr(i))

why is some character when pass through the method upper, yields length of two ? I heard it's related to buffer and unicode (?) I still don't know.

edited Aug 10 '20 at 03:14

wjandrea

asked Aug 09 '20 at 15:37

Sumanto Dinar

5

Try adding `print(i, chr(i), chr(i).upper())` to your loop and you will see... The upper of `ß` is `SS` for example – Tomerikoo Aug 09 '20 at 15:42
can you explain the reason behinds that? – Sumanto Dinar Aug 10 '20 at 03:04
2

This has nothing to do with `len`, that's just what you're using. IMO a better title would be "Why do some characters turn into two characters when I change their case?" – wjandrea Aug 10 '20 at 03:17
1

Related: [How do I do a case-insensitive string comparison?](https://stackoverflow.com/q/319426/4518341) – wjandrea Aug 10 '20 at 03:21
Here's a good example: U+64256 is a ligature, `ﬀ`, which uppercases to `FF`. – wjandrea Aug 10 '20 at 03:26
@wjandrea good example, except it's not within the range being tested here. – Mark Ransom Aug 10 '20 at 03:35
@SumantoDinar what do you mean explain the reason? That's just what those characters are. Their length is 2, there is nothing weird going on, especially not with `len`... – Tomerikoo Aug 10 '20 at 09:00
the reason behind why the upper of ß is SS. – Sumanto Dinar Aug 10 '20 at 10:43
"the reason behind why the upper of ß is SS" has nothing to do with programming, it has to do with the German language. – Mark Ransom Aug 10 '20 at 16:14

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