Python object matching using string

Question

Why i am not able to find the match?

>>> ti = "abcd"
>>> tq = "abcdef"
>>> check_abcd = re.compile('^abcd')
>>> if check_abcd.search(ti) is check_abcd.search(tq):
...     print "Matching"
... else:
...     print "not matching"
...
not matching

Eventhough both variables ti and tq are matching and having same reference

>>> print check_abcd.search(ti)
<_sre.SRE_Match object at 0x7ffbb05559f0>
>>> print check_abcd.search(tq)
<_sre.SRE_Match object at 0x7ffbb05559f0>

Why it is not matching?

try if check_abcd.search(ti).group() == check_abcd.search(tq).group(): — Avinash Raj
– Avinash Raj, Commented Mar 10, 2015 at 8:54
Store the two objects in separate variables and then try. Then their ID will be different (Coz the older object will be overwritten) — Bhargav Rao
– Bhargav Rao, Commented Mar 10, 2015 at 9:05

vks · Accepted Answer · 2015-03-10 09:05:38Z

2

`is` is identity testing, == is equality testing. 
 is will return True if two variables point to the same object, == if the objects referred to by the variables are equal.

You probably want to match values and not objects.So you can use

ti = "abcd"
tq = "abcdef"
check_abcd = re.compile('^abcd')

if check_abcd.search(ti).group(0) == check_abcd.search(tq).group(0):
    print "Matching"
else:
    print "not matching"

answered Mar 10, 2015 at 9:05

vks

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7 Comments

Bhargav Rao Over a year ago

Hey vks! The OP seems to ask as to why is operator is not working even though the object reference point to the same ID. Your answer is perfect! But keep it on hold till the OP clarifies :)

Bhargav Rao Over a year ago

Naw! They'll be overwrittten. That's why even I'm on standby :) Check this comment

Nnz Over a year ago

Yes vks and Bhargav, == is working fine when used with group as attribute. I thought that eventhough objects refer to same id, why it was not matching even if i use == or is.

vks Over a year ago

@user2982007 stackoverflow.com/questions/28963860/…

vks Over a year ago

@BhargavRao stackoverflow.com/questions/28963860/…

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