CODEWITHSUNDEEP
pythonxhtml
Charles Cai
Charles Cai

Reputation: 2791

What is this error mean in Python and XHTML?

It keep showing this error

Traceback (most recent call last):
  File "/home/zca22/public_html/Lab_Assn_5/Scripts/dice.py", line 7, in <module>
    playerGuess = int(formData["guess"].value)
  File "/usr/lib/python2.6/cgi.py", line 541, in __getitem__
    raise KeyError, key
KeyError: 'guess'

I don't know what's wrong iin my code.

import cgi
import random

formData = cgi.FieldStorage()
playerName = formData["name"].value
playerGuess = int(formData["guess"].value)
theLength = 5
sum = 0

print "Content-type: text/html"

print "<p>Thanks for playing, " + playerName + ",</p>"

for die in range(theLength):
    val = random.randint(1,6)
    print '<img src = "Images/dice-%i.gif" alt="%i" width="107" height="107" />' % (val, val)
    sum = sum + val

print "<p>You bet the total would be at least " + playerGuess + ". The total rolled was " + sum + ".</p>"

if playerGuess >= sum:
    print "<p>You won!</p>"
else:
    print """<p>Sorry, you lose!</p>
      </body>
      </html>"""

Upvotes: 0

Views: 586

Answers (5)

machine yearning
machine yearning

Reputation: 10129

In the Python dict dictionary data type, each entry has a key and a value. Your code formData["guess"] tries to access the dictionary formData under the key "guess" to retrieve the underlying value.

Since you're getting a KeyError, your dictionary has no key called "guess". Since the dictionary is populated by your cgi.FieldStorage() call, this can be interpreted as saying that your cgi form object has no field with the name "guess".

Upvotes: 0

icktoofay
icktoofay

Reputation: 129109

It looks like you're not POSTing it a guess value. You should have something like this in the page before:

<form action="/cgi-bin/guess.py" method="post">
    <dl>
        <dt><label for="name_field">Name:</label></dt>
        <dd><input type="text" id="name_field" name="name" required="required" /></dd>
        <dt><label for="guess_field">Guess:</label></dt>
        <dd><input type="number" id="guess_field" name="guess" min="1" max="6" step="1" required="required" /></dd>
    </dl>
    <p><input type="submit" value="Guess" /></p>
</form>

Upvotes: 1

phihag
phihag

Reputation: 288200

There is no "guess" entry in the formData, the dictionary of user inputs. Are you sure you have a field like <input name="guess" value="3" /> in the exact form you're submitting?

Upvotes: 0

MRAB
MRAB

Reputation: 20664

It means that the form doesn't have a "guess" entry, but it does have a "name" entry.

Upvotes: 0

Achim
Achim

Reputation: 15722

Your code expects a value for guess to be in the form data dictionary, but it's not present.

Upvotes: 0

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