Does Python support ++?

Question

Possible Duplicate:
Behaviour of increment and decrement operators in Python

I'm new to Python, I'm confused about ++ python. I've tried to ++num but num's value is not changed:

>>> a = 1
>>> ++a
1
>>> print a
1
>>> print(++a)
1

Could somebody explain this? If Python support ++, why num has not changed. If it doesn't why can I use ++?

@poke Thanks! I've not searched that question, sorry to asked a duplicated question, should I choose an answer or delete this qeustion? — sunkehappy, Nov 05 '12 at 10:06
This topic has been already discussed [Python integer incrementing with ++](http://stackoverflow.com/questions/2632677/python-integer-incrementing-with) — Oleksandr Lysenko, Nov 05 '12 at 10:07
@sunkehappy The question will be closed soon with a link to the other question, so don’t worry about it. — poke, Nov 05 '12 at 10:07
@gefei I don't understand how that's valid syntax - explanation please? — noɥʇʎԀʎzɐɹƆ, Jul 20 '16 at 17:35

score 13 · Answer 1 · answered Nov 05 '12 at 10:04

13

No:

In [1]: a=1

In [2]: a++
------------------------------------------------------------
   File "<ipython console>", line 1
     a++
        ^
SyntaxError: invalid syntax

But you can:

In [3]: a+=1

In [4]: a
Out[4]: 2

answered Nov 05 '12 at 10:04

Joseph Victor Zammit

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" There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. " as stated in the [Zen of Python](https://en.wikipedia.org/wiki/Zen_of_Python) – Kristof Gilicze Apr 08 '21 at 11:49

score 1 · Answer 2 · answered Nov 05 '12 at 10:02

1

It should look like

a = 6
a += 1
print a
>>> 7

answered Nov 05 '12 at 10:02

alexvassel

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Rag Sagar · Answer 3 · 2012-11-05T10:12:09.040

0

There should be one and preferably only one obvious way to do it

>>> a = 1
>>> a += 1
>>> a
2

edited Nov 05 '12 at 10:12

answered Nov 05 '12 at 10:06

Rag Sagar

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Does Python support ++?

3 Answers3

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