multiple parameters in if statement...

[Kun]

I am trying to make an if-statement that will not do anything and print
'nothing entered' if there is nothing entered in a form. I have the
following code that does that, however, now even if I enter something
into the form, the code still outputs 'nothing entered'. This violates
the if statement and I am wondering what I did wrong.

if form.has_key("d elete_id") and form["delete_id"].value != "" and
form.has_key("d elete_date") and form["delete_dat e"].value != "" and
form.has_key("d elete_purchaset ype") and
form["delete_purchas etype"].value != "" and form.has_key("d elete_price")
and form["delete_pri ce"].value != "" and form.has_key("d elete_comment")
and form["delete_comment "].value != "":
delete_id=form['delete_id'].value
delete_date=for m['delete_date'].value
delete_purchase type=form['delete_purchas etype'].value
delete_price=fo rm['delete_price'].value
delete_comment= form['delete_comment '].value
else:
print "ERROR: Nothing entered!"
raise Exception

[mensanator@aol.com]

Re: multiple parameters in if statement...


Kun wrote:[color=blue]
> I am trying to make an if-statement that will not do anything and print
> 'nothing entered' if there is nothing entered in a form. I have the
> following code that does that, however, now even if I enter something[/color]

Yes, but did you enter everything?
[color=blue]
> into the form, the code still outputs 'nothing entered'.[/color]

The logic doesn't imply "nothing", it implies "not everything".
The else clause will execute if ANY item is not enetered.
[color=blue]
> This violates
> the if statement and I am wondering what I did wrong.
>
> if form.has_key("d elete_id") and form["delete_id"].value != "" and
> form.has_key("d elete_date") and form["delete_dat e"].value != "" and
> form.has_key("d elete_purchaset ype") and
> form["delete_purchas etype"].value != "" and form.has_key("d elete_price")
> and form["delete_pri ce"].value != "" and form.has_key("d elete_comment")
> and form["delete_comment "].value != "":
> delete_id=form['delete_id'].value
> delete_date=for m['delete_date'].value
> delete_purchase type=form['delete_purchas etype'].value
> delete_price=fo rm['delete_price'].value
> delete_comment= form['delete_comment '].value
> else:
> print "ERROR: Nothing entered!"
> raise Exception[/color]

[Kun]

Re: multiple parameters in if statement...

mensanator@aol. com wrote:[color=blue]
> Kun wrote:[color=green]
>> I am trying to make an if-statement that will not do anything and print
>> 'nothing entered' if there is nothing entered in a form. I have the
>> following code that does that, however, now even if I enter something[/color]
>
> Yes, but did you enter everything?
>[color=green]
>> into the form, the code still outputs 'nothing entered'.[/color]
>
> The logic doesn't imply "nothing", it implies "not everything".
> The else clause will execute if ANY item is not enetered.
>[color=green]
>> This violates
>> the if statement and I am wondering what I did wrong.
>>
>> if form.has_key("d elete_id") and form["delete_id"].value != "" and
>> form.has_key("d elete_date") and form["delete_dat e"].value != "" and
>> form.has_key("d elete_purchaset ype") and
>> form["delete_purchas etype"].value != "" and form.has_key("d elete_price")
>> and form["delete_pri ce"].value != "" and form.has_key("d elete_comment")
>> and form["delete_comment "].value != "":
>> delete_id=form['delete_id'].value
>> delete_date=for m['delete_date'].value
>> delete_purchase type=form['delete_purchas etype'].value
>> delete_price=fo rm['delete_price'].value
>> delete_comment= form['delete_comment '].value
>> else:
>> print "ERROR: Nothing entered!"
>> raise Exception[/color]
>[/color]
How do I make this so that it only prints 'nothing entered' when none of
the fields are entered?

[Peter Otten]

Re: multiple parameters in if statement...

Kun wrote:
[color=blue]
> mensanator@aol. com wrote:[color=green]
>> Kun wrote:[color=darkred]
>>> I am trying to make an if-statement that will not do anything and print
>>> 'nothing entered' if there is nothing entered in a form. I have the
>>> following code that does that, however, now even if I enter something[/color]
>>
>> Yes, but did you enter everything?
>>[color=darkred]
>>> into the form, the code still outputs 'nothing entered'.[/color]
>>
>> The logic doesn't imply "nothing", it implies "not everything".
>> The else clause will execute if ANY item is not enetered.
>>[color=darkred]
>>> This violates
>>> the if statement and I am wondering what I did wrong.
>>>
>>> if form.has_key("d elete_id") and form["delete_id"].value != "" and
>>> form.has_key("d elete_date") and form["delete_dat e"].value != "" and
>>> form.has_key("d elete_purchaset ype") and
>>> form["delete_purchas etype"].value != "" and form.has_key("d elete_price")
>>> and form["delete_pri ce"].value != "" and form.has_key("d elete_comment")
>>> and form["delete_comment "].value != "":
>>> delete_id=form['delete_id'].value
>>> delete_date=for m['delete_date'].value
>>> delete_purchase type=form['delete_purchas etype'].value
>>> delete_price=fo rm['delete_price'].value
>>> delete_comment= form['delete_comment '].value
>>> else:
>>> print "ERROR: Nothing entered!"
>>> raise Exception[/color]
>>[/color]
> How do I make this so that it only prints 'nothing entered' when none of
> the fields are entered?[/color]

def has_data(form, fields):
for field in fields:
if form.has_key(fi eld) and form[field] != "":
return True
return False

fields = ["delete_id" , "delete_dat e", "delete_purchas etype", "delete_pri ce",
"delete_comment "]

if not has_data(form, fields):
print "nothing entered"

Just testing for

if field in form: ...

instead of

if form.has_key(fi eld) and form[field] != "": ...

is probably sufficient if form is a cgi.FieldStorag e.

Peter