python: cannot concatenate 'str' and 'tuple' objects (it should works!)

Question

I have a code:

print "bug " + data[str.find(data,'%')+2:-1]
temp = data[str.find(data,'%')+2:-1]
time.sleep(1)
print "bug tuple " + tuple(temp.split(', '))

And after this my application displays:

bug 1, 2, 3 Traceback (most recent call last): File "C:\Python26\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", line 312, in RunScript exec codeObject in main.dict File "C:\Documents and Settings\k.pawlowski\Desktop\atsserver.py", line 165, in print "bug tuple " + tuple(temp.split(', ')) TypeError: cannot concatenate 'str' and 'tuple' objects

I don't know what I make wrong. print tuple('1, 2, 3'.split(', ')) works properly.

When in doubt, test it in the interactive interpreter!! >>> ftw! — jathanism
– jathanism, Commented Aug 31, 2010 at 14:00

Ivo van der Wijk · Accepted Answer · 2010-08-31 13:54:43Z

19

print tuple(something)

may work because print will do an implicit str() on the argument, but and expression like

"" + ()

does not work. The fact that you can print them individually doesn't make a difference, you can't concatenate a string and a tuple, you have to convert either one of them. I.e.

print "foo" + str(tuple("bar"))

However, depending on str() for conversion probably won't give the desired results. Join them neatly using a separator using ",".join for example

answered Aug 31, 2010 at 13:54

Ivo van der Wijk

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Comments

Maciej Kucharz · Accepted Answer · 2010-08-31 13:57:42Z

3

Why do you think it should work?

try:

print "bug tuple " + str(tuple(temp.split(', ')))

answered Aug 31, 2010 at 13:57

Maciej Kucharz

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Moe · Accepted Answer · 2010-08-31 13:57:09Z

2

Change it to

print "bug tuple ", tuple(temp.split(', '))

answered Aug 31, 2010 at 13:57

Moe

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1 Comment

CarolusPl Over a year ago

this is it ;) thanks. I am stupid after many hours of coding.. ;)

Tony Veijalainen · Accepted Answer · 2010-08-31 14:47:40Z

0

Why tuple by splitting, you have string for one ready except the paranthesis, why not:

print "bug tuple (%s)" % '1, 2, 3'

answered Aug 31, 2010 at 14:47

Tony Veijalainen

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samsamara · Accepted Answer · 2016-05-23 02:48:32Z

0

No need of tuple(), following works,

outstr = str((w,t)) # (w,t) is my tuple

answered May 23, 2016 at 2:48

samsamara

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