[mod_python] using nested blocks in psp

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  • cloc3
    #1

    [mod_python] using nested blocks in psp

    I'm a newbie in python, and I'm fighting against nested blocks in psp.
    Thats a little example with a funny behaviour:
    Code:
    <html>
<form>
<select name="List">
<!--makes a list with a loop -->

<%
for i in range(50, 350, 50):
if 'List' in form and int(form['List'])==i:
sel="selected"
else:
sel="pippo"
%><option value="<%=i%>" <%=sel%> ><%=i%> </option>
<%
%>
</select>
<input type="submit" value="return"/>
</form>
</html>
    In my intention, the for instruction have to run two operation:
    first: the if instruction
    second: to print the option tag on the html page.

    Instead, the real behaviour is depending on the result of the control
    in the if:
    if the control is true, the option tag is not printed, and the for
    instruction goes to the successive step.
    if the control is false, the option is correctly printed.

    I don't understand the reason of this behaviour.
    Which is the right way to control the nested block instructions in psp?

    Tags: None
    • grahamd@dscpl.com.au
      #2
      Re: [mod_python] using nested blocks in psp

      cloc3 wrote:[color=blue]
      > I'm a newbie in python, and I'm fighting against nested blocks in psp.
      > Thats a little example with a funny behaviour:
      >
      Code:
      > <html>
> <form>
> <select name="List">
> <!--makes a list with a loop -->
>
> <%
> for i in range(50, 350, 50):
>  if 'List' in form and int(form['List'])==i:
>   sel="selected"
>  else:
>   sel="pippo"
>  %><option value="<%=i%>" <%=sel%> ><%=i%> </option>
>  <%
> %>
> </select>
> <input type="submit" value="return"/>
> </form>
> </html>
>
      > In my intention, the for instruction have to run two operation:
      > first: the if instruction
      > second: to print the option tag on the html page.
      >
      > Instead, the real behaviour is depending on the result of the control
      > in the if:
      > if the control is true, the option tag is not printed, and the for
      > instruction goes to the successive step.
      > if the control is false, the option is correctly printed.
      >
      > I don't understand the reason of this behaviour.
      > Which is the right way to control the nested block instructions in psp?[/color]

      PSP as implemented by mod_python is fussy about how many spaces are
      used in indents. Use either 8 space or tab indents. If you don't want
      to do that, you will need to use comment hints to help PSP understand
      what level of indenting you are using. See:

      [mod_python] psp problem
      http://www.modpython.org/pipermail/mod_python/2005-May/018102.html


      Comment hints may still be needed in certain cases to turn off scopes
      even if 8 space or tab indents are needed so it is good to understand
      what they are about.

      Also ask further questions on mod_python user mailing list as you will
      in general get better responses there.

      Graham

        Comment

        • cloc3
          #3
          Re: [mod_python] using nested blocks in psp

          grahamd@dscpl.c om.au wrote:
          See:[color=blue]
          >
          > http://www.modpython.org/pipermail/m...ay/018102.html
          >
          > Comment hints may still be needed in certain cases to turn off scopes
          > even if 8 space or tab indents are needed so it is good to understand
          > what they are about.
          >[/color]

          Thank you. That solves my problem.
          Here the good code:
          Code:
          <html>
<form>
<select name="Elenco">
<!--genera elenco usando un loop -->

<%
for i in range(50, 350, 50):
%>
<option value="<%=i%>"
<%
if 'Elenco' in form and int(form['Elenco'])==i:
%>
selected
<%
#end if
%>[color=blue]
><%=i%>[/color]
</option>
<%
# end for
%>
</select>
<input type="submit" value="acquisizione"/>
</form>
</html>

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