num++ marked as syntax error in python - why? [duplicate]

Question

Consider the following xml file (lieferungen2.xml):

<?xml version="1.0"?>
<lieferungen>
    <artikel id="1">
       <name>apple</name>
       <preis >2</preis>
       <lieferant>Friedman</lieferant>
    </artikel>
</lieferungen>

With the following code, I wanted to print "apple" to the command line:

import xml.dom.minidom 

dom = xml.dom.minidom.parse("lieferungen2.xml")

a = dom.getElementsByTagName("artikel")

num=0


while(True):

    if a[0].childNodes[num].nodeName != "name":
        num++
    else:
        break

print(a[0].childNodes[num].childNodes[0].nodeValue)

However, I get the following error message:

    num++
        ^
SyntaxError: invalid syntax

To me this syntax looks perfectly fine? What's wrong here?

It's marked as a syntax error because it's not Python syntax. — TigerhawkT3
– TigerhawkT3, Commented Dec 25, 2016 at 0:19
You can also refer to stackoverflow.com/questions/3654830/why-are-there-no-and-operators-in-python to have an idea why increment operators are not a part of Python. — Pulkit Goyal
– Pulkit Goyal, Commented Dec 25, 2016 at 0:27

Pike D. · Accepted Answer · 2016-12-25 00:12:58Z

0

num++ is not valid Python code, it would be like this

num += 1

answered Dec 25, 2016 at 0:12

Pike D.

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Comments

Ben Stobbs · Accepted Answer · 2016-12-25 00:14:05Z

0

Python does not support x ++ to increase a variable by one.

Instead, you have to do x += 1.

So your code would be:

if a[0].childNodes[num].nodeName != "name":
    num += 1
else:
    break

answered Dec 25, 2016 at 0:14

Ben Stobbs

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