[Tutor] html and mod_python

[Tim Golden]

[Patty]
| I tried the following piece of code and got : 
| 
| "TypeError: not enough arguments for format string"    
| 
|         tag = """
|         <select name='percent'>
|         <option selected VALUE=%s>%s</option>
| 
|         <option VALUE='-'>-</option>
|         <option VALUE='0'>0%</option>
|         <option VALUE='10'>10%</option>
|         <option VALUE='20'>20%</option>

[... snip similar lines ...]

|         </select>""" % (selected_value,selected_value)

When Python sees % inside a string which is then
qualified by a % operator, it expects *every one*
of the % signs to introduce a substitution qualifier,
like %s or %d. If you actually want a % sign in the
string -- and you do here -- you need to put *two*
% signs.

So this will work:

discount_achieved = 15
print "I got %d%% discount" % discount_achieved

while this won't:

discount_achieved = 15
print "I got %d% discount" % discount_achieved

So, replace all the 10%, 20% etc in your string
with 10%% and 20%%.

TJG

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