Level 0

are you suppose to change the 2 and 3

So, here is the solution for those, who are having trouble with the first challenge:

Open the Terminal.

Write: python

Write: print 2**38

The solution will then be given to you

hey for Py-challenge do you manually enter your solution into the url or is there a way in Python's library for me figure out how to do that automatically with Python? I'm a beginner to Python and I'm not a big fan of Manual manipulation

2**38.html
print:give a answer,not question
so the answer is result of 2**38

change 0 to 274877906944 and try

Because I pasted the answer nnnnn.html and was faced with page not found. I don't think the answer is wrong. Unless Ruby and Python return different answers.

Yes, the site is still operational. You just have to post the right answer

it's so easy!
power(2,38)
then change the url.

I have solved this problem by typing "http://www.pythonchallenge.com/pc/def/[the correct answer].html". However when I tried to reach the solution by typing "http://www.pythonchallenge.com/ppc/def/[the correct answer].html" or "http://www.pythonchallenge.com/ppc/def/0.html", I got both "404 Not Found" errors.

Can anybody help me out? Thanks.

Typing "http://www.pythonchallenge.com/pc/def/[the correct answer].html" redirects you to level one whose URL is "http://www.pythonchallenge.com/pc/def/[level 1's URL].html". Once you get there, you can go to "http://www.pythonchallenge.com/pcc/def/[level 1's URL].html" to check out the solution page.

Note that it's pcc and not ppc.

Typing "http://www.pythonchallenge.com/pc/def/[the correct answer].html" redirects you to level one whose URL is "http://www.pythonchallenge.com/pc/def/[level 1's URL].html". Once you get there, you can go to "http://www.pythonchallenge.com/pcc/def/[level 1's URL].html" to check out the solution page.

Note that it's pcc and not ppc.

fuh, little hint and voala thank you for helping me to cope with this issue too.

is this like the competition ACM ? I submit my code than I will see whether I accept or wrong answer?

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Hello all buyer
I'm seller and alway sell CC fresh with good balance.
I hope u good customers and will be long-term cooperation
* www.cv2store.net is the best automatic sell cvv online store with the good rate 90-95% vaild fresh cvv with cheap price

CVV ON SHOP ONLY SELL US CANADA UK ( BUY CC EU , ASIA , AU .... contact yahoo : cvv_store )

Exchanger WU to Lr
100$ WU = 95 Lr
200$ WU = 190Lr
.....

Price CCV
- Us Visa/mas = 2.5$ / 1cc
Us Amex/disco = 5$ / 1cc
Us fullz = 20$ / 1cc ( full name , state , zipcode , address , phone number , ssn , dob, pin...)

- Canada visa/mas = 7$ / 1cc
- CA amex = 10$ / 1cc
CA fullz = 35$/ 1cc ( full name , state , zipcode , address , phone number , ssn , dob, pin...)

- UK visa/mas = 8$ / 1cc
- Uk amex/dis = 10$/ 1cc

- AU visa/mas = 10$ / 1cc
- Au amex/dis = 12$/ 1cc

- EU / EU fullz = 50$ / 1cc ( full name , state , zipcode , address , phone number , ssn , dob, pin...)

Italy visa/mas = 17$ / 1cc
Italy amex/dis = 20$ / 1cc

Ireland visa/mas = 17$ / 1cc
Ireland amex/disco = 20$/ 1cc

France visa/mas = 17$/1cc
France amex/disco = 20$ / 1cc

Germany visa/mas = 17$/ 1cc
Ger amex/disco = 20$/ 1cc

Norway visa/mas = 17$/ 1cc
Norway amex/disco = 20$/ 1cc

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Mail : cvv_store@yahoo.com
Buy throught yahoo we will warranty cvv 24 hours
If buy from shop only 20 min
Because some buyer not good , buy and kill cc so fast then site will change cc

- The checking fee is $0.1 for VALID cards
u can buy test and if good we deal long time
Accept payment Lr if u dont have Lr we will accept Westerunion Money gram
* Min accept Western union Money gram = 100$

Also have Gift itunes XX / XM ( contact YH : cvv_store ) , walmart - Egift card
gift itunes 50$ price 20$ ( buy 50 more 15$ / 1 )
Gift itunes 100$ price 35$ ( buy 50 more 30$ / 1 )
E-G walmart 100$ = 35$
E-G walmart 150$ = 50$

Mail pass login acc amazon , ebay , paypal , apple , walmart.... ( aol , hotmail , gmail, verizon , comcast ... )
1000 mail pass uncheck = 25$
1000 mail pass checker = 50$
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I honestly don't understand why one would use the Python code

Python REPL

  Code:

>>> 2 ** 38

when instead one could simply use the Java code:

TwoRaisedThirtyEight.java

  Code:

/*
* Copyright (C) 2013 Justin Hanekom <justin.hanekom@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*/
package ca.kjmj;

import ca.kjmj.lang.Numbers;
import ca.kjmj.lang.Strings;

/**
* Prints 2 to the power of 38
*
* @version 1.0
* @author Justin Hanekom
*
*/
public final class TwoRaisedThirtyEight {

    /**
     * Prints 2 raised to the power of 38 to the standard output stream
     *
     * @param args
     *            command-line arguments (not used)
     * @since 1.0
     */
    public static void main(final String[] args) {
        System.out.println(Strings.rightAlign(Numbers
                .createDefaultDecimalFormat().format(Math.pow(2, 38)),
                TwoRaisedThirtyEight.OUTPUT_WIDTH));
    }

    /**
     * width of the resulting output string that is printed to the standard
     * output stream
     */
    private static final int OUTPUT_WIDTH = 20;

    /**
     * Default constructor - suppressed because this class cannot be
     * instantiated
     */
    private TwoRaisedThirtyEight() {
        throw new AssertionError("this class cannot be instantiated");
    }

}


TwoRaisedThirtyEightTest.java

  Code:

/*
* Copyright (C) 2013 Justin Hanekom <justin.hanekom@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*/
package ca.kjmj;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import org.junit.Assert;
import org.junit.Test;

public class TwoRaisedThirtyEightTest {

    @Test
    public void testPrintsTwoRaisedThirtyEight() {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        System.setOut(new PrintStream(out));
        TwoRaisedThirtyEight.main(null);
        Assert.assertEquals(out.toString(), "     274,877,906,944\n");
    }

}


Strings.java

  Code:

/*
Copyright (C) 2013 Justin Hanekom <justin.hanekom@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
package ca.kjmj.lang;

/**
* Contains additional functionality for the built-in String class
*
* @version 1.0
* @author Justin Hanekom
*
*/
public final class Strings {

   /**
    * Left aligns the string str in a string of length width. The string is
    * padded to the right with spaces (' ') if necessary
    *
    * @param str
    *            the string to left-align, may be null
    * @param width
    *            the length to pad the string to
    * @return left aligned string; returns the original string if it is null or
    *         if no padding is necessary
    * @throws IllegalArgumentException
    *             if width is less than or equal to 0
    * @since 1.0
    */
   public static final String leftAlign(final String str, final int width) {
      if (str == null) {
         return null;
      }
      if (width <= 0) {
         throw new IllegalArgumentException(
               "width must be greater than zero: " + width);
      }
      return String.format("%1$-" + width + "s", str);
   }

   /**
    * Right aligns the string str in a string of length width. The string is
    * padded to the left with spaces (' ') if necessary
    *
    * @param str
    *            the string to right-align, may be null
    * @param width
    *            the length to pad the string to
    * @return right aligned string; returns the original string if it is null
    *         or if no padding is necessary
    * @throws IllegalArgumentException
    *             if width is less than or equal to 0
    * @since 1.0
    */
   public static final String rightAlign(final String str, final int width) {
      if (str == null) {
         return null;
      }
      if (width <= 0) {
         throw new IllegalArgumentException(
               "width must be greater than zero: " + width);
      }
      return String.format("%1$" + width + "s", str);
   }

   /**
    * Default constructor - suppressed because this class cannot be
    * instantiated
    */
   private Strings() {
      throw new AssertionError("this class cannot be instantiated");
   }

}


StringsTest.java

  Code:

/*
Copyright (C) 2013 Justin Hanekom <justin.hanekom@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package ca.kjmj.lang;

import junit.framework.Assert;

import org.junit.Test;

public class StringsTest {

   @Test(expected = IllegalAccessException.class)
   public void testCannotCreateAStringsInstance()
         throws IllegalAccessException, InstantiationException,
         ClassNotFoundException {
      Class.forName("ca.kjmj.lang.Strings").newInstance();
   }

   @Test
   public void testLeftAlignPadsRightWithSpaces() {
      Assert.assertEquals("Strings.leftAlign() should pad the right-hand "
            + "side with space characters", "xyz ",
            Strings.leftAlign("xyz", 4));
   }

   @Test
   public void testLeftAlignReturnsNullIfOriginalStringIsNull() {
      Assert.assertNull("Strings.leftAlign() should return null if given "
            + "a null as the string to left-align",
            Strings.leftAlign(null, 1));
   }

   @Test
   public void testLeftAlignReturnsOriginalStringIfWidthExceeded() {
      Assert.assertEquals("Strings.leftAlign() should return the given "
            + "string if the string is larger than the requested width",
            "xyz", Strings.leftAlign("xyz", 1));
   }

   @Test(expected = IllegalArgumentException.class)
   public void testLeftAlignThrowsIllegalArgumentExceptionIfWidthZeroOrLess() {
      Strings.leftAlign("xyz", -1);
   }

   @Test
   public void testRightAlignPadsLeftWithSpaces() {
      Assert.assertEquals("Strings.rightAlign() should pad the left-hand "
            + "side with space characters", " xyz",
            Strings.rightAlign("xyz", 4));
   }

   @Test
   public void testRightAlignReturnsNullIfOriginalStringIsNull() {
      Assert.assertNull("Strings.rightAlign() should return null if given "
            + "a null as the string to right-align",
            Strings.rightAlign(null, -1));
   }

   @Test
   public void testRightAlignReturnsOriginalStringIfWidthExceeded() {
      Assert.assertEquals("Strings.rightAlign() should return the given "
            + "string if the string is larger than the requested width",
            "xyz", Strings.rightAlign("xyz", 3));
   }

   @Test(expected = IllegalArgumentException.class)
   public void testRightAlignThrowsIllegalArgumentExceptionIfWidthZeroOrLess() {
      Strings.leftAlign("xyz", 0);
   }

}


Numbers.java

  Code:

/*
Copyright (C) 2013 Justin Hanekom <justin.hanekom@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package ca.kjmj.lang;

import java.text.DecimalFormat;

/**
* Contains additional functionality for the built-in Number-based classes
*
* @version 1.0
* @author Justin Hanekom
*
*/
public final class Numbers {

   /**
    * @return newly created DecimalFormat object for the default locale
    * @since 1.0
    */
   public static final DecimalFormat createDefaultDecimalFormat() {
      return new DecimalFormat();
   }

   /**
    * Default constructor - suppressed because this class cannot be
    * instantiated
    */
   private Numbers() {
      throw new AssertionError("this class cannot be instantiated");
   }

}


NumbersTest.java

  Code:

/*
Copyright (C) 2013 Justin Hanekom <justin.hanekom@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package ca.kjmj.lang;

import org.junit.Assert;
import org.junit.Test;

public class NumbersTest {

   @Test(expected = IllegalAccessException.class)
   public void testCannotCreateANumbersInstance()
         throws IllegalAccessException, InstantiationException,
         ClassNotFoundException {
      Class.forName("ca.kjmj.lang.Numbers").newInstance();
   }

   @Test
   public void testCreatesADefaultDecimalFormat() {
      Assert.assertNotNull(
            "Numbers.createDefaultDecimalFormat() returned null. "
                  + "It should return a DecimalFormat instance",
            Numbers.createDefaultDecimalFormat());
   }

   @Test
   public void testEachDefaultDecimalFormatIsANewInstance() {
      Assert.assertNotSame(
            "Numbers.createDefaultDecimalFormat() returned the same "
                  + "instance. Each call should return a unique instance",
            Numbers.createDefaultDecimalFormat(),
            Numbers.createDefaultDecimalFormat());
   }

}


Justin