unicode string equivalent of contain

There is no difference between str and unicode.

print u"ábc" in u"some ábc"
print "abc" in "some abc"

is basically the same.

The same for ascii and utf8 strings:

if k in s:
    print "contains"

There is no contains() on either ascii or uft8 strings:

>>> "strrtinggg".contains
AttributeError: 'str' object has no attribute 'contains'

What you can use instead of contains is find or index:

if k.find(s) > -1:
    print "contains"

try:
    k.index(s)
except ValueError:
    pass  # ValueError: substring not found
else:
    print "contains"

But of course, the in operator is the way to go, it's much more elegant.

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