Python and HTML hidden input variables

[Thomas Wouters]

On Fri, Oct 22, 1999 at 01:28:12PM +0000, rainer2207 at my-deja.com wrote:

> I was wondering how I could pass a variable using the hidden field. That
> is I'd like to do something like this:

> test = "Hello"
> print "<input type=\"HIDDEN\" name=\"username\"  value=test>"

> but this returns the string test rather than "Hello". Is there anyway
> I can get it to pass "Hello"? Am I right in leaving out the double
> quotes for the value part? Any help would be appreciated. Thanks.

You can do it three ways:

>>> print '<input type="HIDDEN" name="username"  value="', test, '">'


(Note that i mixed single and double quotes to avoid the escaping of the
originally used quotes... makes for better reading, imho.)

But this inserts a space between the quotes and the value of 'test',

>>> print '<input type="HIDDEN" name="username"  value="' + test + '">'

This doesn't insert a space, but might not work correctly if 'test' is not a
string (but, for instance, an object doing something entirely different on
'+'.)

print '<input type="HIDDEN" name="username"  value="%s">'%test

This uses C's 'printf'-style string creation... the '%s' is replaced by the
(string-)value of 'test'. If 'test' isn't a string, it's converted into one
(or an error is raised, if it refuses.)

Note that the ""%... string creation thing can be tricky when you want to
include more things. You need to make the argument to % a tuple, like this:

print '<input type="HIDDEN" name="%s" value="%s"'%(test1, test2)

Please do see the tutorial for more info about print tricks (and about all
other neat tricks in python, of course ;)

http://www.python.org/doc/tut/-ly y'rs,
-- 
Thomas Wouters <thomas at xs4all.net>

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