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Coordinate Grid Points

Hello,
I am very knew to python and am attempting to write a program
in python that a friend of mine is having to write in java. I am doing
this for fun and would like some help as to how i can generate random
coordinate points (x,y) and compare them with user inputted coordinate
points. For example how will I be able to access the separate values,
the x from the x,y position. I think I understand everything except
1)the random coordinate points 2) the getting the users inputted x and
y values in one line ("Please guess a coordinate point from (1,1) to
(20,20): ") as opposed to ("Please enter an x value:" and "Please
enter a y value") and finally 3) acessing the x value from the x,y
coordinate function. the assignment description is located here http://
http://www.cs.washington.edu/educati...07wi/homework/
homework.html if you would like to see a more in depth discription of
the game.

Many Thanks,
Eric

Feb 5 '07 #1
9 5247
Er*************@gmail.com wrote:
Hello,
I am very knew to python and am attempting to write a program
in python that a friend of mine is having to write in java. I am doing
this for fun and would like some help as to how i can generate random
coordinate points (x,y) and compare them with user inputted coordinate
points. For example how will I be able to access the separate values,
the x from the x,y position. I think I understand everything except
1)the random coordinate points 2) the getting the users inputted x and
y values in one line ("Please guess a coordinate point from (1,1) to
(20,20): ") as opposed to ("Please enter an x value:" and "Please
enter a y value") and finally 3) acessing the x value from the x,y
coordinate function. the assignment description is located here http://
http://www.cs.washington.edu/educati...07wi/homework/
homework.html if you would like to see a more in depth discription of
the game.

Many Thanks,
Eric
For 1: see the random module (e.g. random.randint)
For 2: see the "eval" function and "raw input"
For 2 (without cheating): see the re module. For example:

map(int, re.compile("\(?(\d+),(\d+)\)?").search(inpt).group s())

(Giving you the latter because eval will do this for you anyway.)

Also see "raw_input".

James
Feb 5 '07 #2
Er*************@gmail.com wrote:
Hello,
I am very knew to python and am attempting to write a program
in python that a friend of mine is having to write in java. I am doing
this for fun and would like some help as to how i can generate random
coordinate points (x,y) and compare them with user inputted coordinate
points. For example how will I be able to access the separate values,
the x from the x,y position. I think I understand everything except
1)the random coordinate points 2) the getting the users inputted x and
y values in one line ("Please guess a coordinate point from (1,1) to
(20,20): ") as opposed to ("Please enter an x value:" and "Please
enter a y value") and finally 3) acessing the x value from the x,y
coordinate function. the assignment description is located here http://
http://www.cs.washington.edu/educati...07wi/homework/
homework.html if you would like to see a more in depth discription of
the game.

Many Thanks,
Eric
For the game described, the input is of the form "20 20", so (1) eval
won't work and (2) regex is not needed. So you should use a healthy
combo of map(), inpt.split(), int(), and inpt.strip() (assuming inpt is
the string input). But not necessarily in the order listed.
Feb 5 '07 #3
On Feb 5, 3:29 pm, James Stroud <jstr...@mbi.ucla.eduwrote:
Eric.Gabriel...@gmail.com wrote:
Hello,
I am very knew to python and am attempting to write a program
in python that a friend of mine is having to write in java. I am doing
this for fun and would like some help as to how i can generate random
coordinate points (x,y) and compare them with user inputted coordinate
points. For example how will I be able to access the separate values,
the x from the x,y position. I think I understand everything except
1)the random coordinate points 2) the getting the users inputted x and
y values in one line ("Please guess a coordinate point from (1,1) to
(20,20): ") as opposed to ("Please enter an x value:" and "Please
enter a y value") and finally 3) acessing the x value from the x,y
coordinate function. the assignment description is located here http://
http://www.cs.washington.edu/educati...07wi/homework/
homework.html if you would like to see a more in depth discription of
the game.
Many Thanks,
Eric

For 1: see the random module (e.g. random.randint)
For 2: see the "eval" function and "raw input"
For 2 (without cheating): see the re module. For example:
************************************************** ***************************
***map(int, re.compile("\(?(\d+),(\d+)\)?").search(inpt).group s())****
************************************************** ***************************
(Giving you the latter because eval will do this for you anyway.)

Also see "raw_input".

James
Thank you very much for your response i will play around with the code
when I have some time ( hopefully later tonight) but could you please
breakdown what the part that I surrounded with asterisks, I think I
recognize it but don't understand it.

Eric

Feb 6 '07 #4
Er*************@gmail.com wrote:
On Feb 5, 3:29 pm, James Stroud <jstr...@mbi.ucla.eduwrote:
>>Eric.Gabriel...@gmail.com wrote:
>>>Hello,
I am very knew to python and am attempting to write a program
in python that a friend of mine is having to write in java. I am doing
this for fun and would like some help as to how i can generate random
coordinate points (x,y) and compare them with user inputted coordinate
points. For example how will I be able to access the separate values,
the x from the x,y position. I think I understand everything except
1)the random coordinate points 2) the getting the users inputted x and
y values in one line ("Please guess a coordinate point from (1,1) to
(20,20): ") as opposed to ("Please enter an x value:" and "Please
enter a y value") and finally 3) acessing the x value from the x,y
coordinate function. the assignment description is located here http://
http://www.cs.washington.edu/educati...07wi/homework/
homework.html if you would like to see a more in depth discription of
the game.
>>>Many Thanks,
Eric

For 1: see the random module (e.g. random.randint)
For 2: see the "eval" function and "raw input"
For 2 (without cheating): see the re module. For example:
************************************************ *****************************
***map(int, re.compile("\(?(\d+),(\d+)\)?").search(inpt).group s())****
************************************************ *****************************
(Giving you the latter because eval will do this for you anyway.)

Also see "raw_input".

James


Thank you very much for your response i will play around with the code
when I have some time ( hopefully later tonight) but could you please
breakdown what the part that I surrounded with asterisks, I think I
recognize it but don't understand it.

Eric
"re" is the regular expression module for python. "re.compile()"
compiles the regular expression into a regular expression object with
certain attributes, one of which is "search". "search" searches a
string, here "inpt", and this produces a "match" (actually a
_sre.SRE_Match) object that has, as one of its attributes, a "groups()"
method that returns matches to the grouped expressions inside the
regular expression, i.e. expressions surrounded by un-escaped parentheses.

Inside of the quotes is a regular expression string, (that, in general,
should be preceded immediately by a lowercase r--but is not here because
it doesn't matter in this case and I forgot to). map() maps a callable
(here int) to the list of groups returned by groups(). Each group is a
string matching r"\d+" which is an expression for one or more digits.
Each group is converted into an integer and map returns a list of
integers. I escaped the enclosing parentheses and put question marks
(match zero or one) so that the enclosing parentheses would be optional.
This makes all of the following evaluate to [20, 20]:

"20,20"
"(20,20"
"20,20)"
"(20,20)"

Except for typos, the middle two would be quite uncommon for user input,
but would match the expression. Note also, that I didn't allow for
whitespace anywhere, which might be expected. Arbitrary whitespace is
matched by r"\s*".

James
Feb 6 '07 #5
On Feb 5, 6:33 pm, James Stroud <jstr...@mbi.ucla.eduwrote:
Eric.Gabriel...@gmail.com wrote:
On Feb 5, 3:29 pm, James Stroud <jstr...@mbi.ucla.eduwrote:
>Eric.Gabriel...@gmail.com wrote:
>>Hello,
I am very knew to python and am attempting to write a program
in python that a friend of mine is having to write in java. I am doing
this for fun and would like some help as to how i can generate random
coordinate points (x,y) and compare them with user inputted coordinate
points. For example how will I be able to access the separate values,
the x from the x,y position. I think I understand everything except
1)the random coordinate points 2) the getting the users inputted x and
y values in one line ("Please guess a coordinate point from (1,1) to
(20,20): ") as opposed to ("Please enter an x value:" and "Please
enter a y value") and finally 3) acessing the x value from the x,y
coordinate function. the assignment description is located here http://
http://www.cs.washington.edu/educati...07wi/homework/
homework.html if you would like to see a more in depth discription of
the game.
>>Many Thanks,
Eric
>For 1: see the random module (e.g. random.randint)
For 2: see the "eval" function and "raw input"
For 2 (without cheating): see the re module. For example:
************************************************* ****************************
***map(int, re.compile("\(?(\d+),(\d+)\)?").search(inpt).group s())****
************************************************* ****************************
(Giving you the latter because eval will do this for you anyway.)
>Also see "raw_input".
>James
Thank you very much for your response i will play around with the code
when I have some time ( hopefully later tonight) but could you please
breakdown what the part that I surrounded with asterisks, I think I
recognize it but don't understand it.
Eric

"re" is the regular expression module for python. "re.compile()"
compiles the regular expression into a regular expression object with
certain attributes, one of which is "search". "search" searches a
string, here "inpt", and this produces a "match" (actually a
_sre.SRE_Match) object that has, as one of its attributes, a "groups()"
method that returns matches to the grouped expressions inside the
regular expression, i.e. expressions surrounded by un-escaped parentheses.

Inside of the quotes is a regular expression string, (that, in general,
should be preceded immediately by a lowercase r--but is not here because
it doesn't matter in this case and I forgot to). map() maps a callable
(here int) to the list of groups returned by groups(). Each group is a
string matching r"\d+" which is an expression for one or more digits.
Each group is converted into an integer and map returns a list of
integers. I escaped the enclosing parentheses and put question marks
(match zero or one) so that the enclosing parentheses would be optional.
This makes all of the following evaluate to [20, 20]:

"20,20"
"(20,20"
"20,20)"
"(20,20)"

Except for typos, the middle two would be quite uncommon for user input,
but would match the expression. Note also, that I didn't allow for
whitespace anywhere, which might be expected. Arbitrary whitespace is
matched by r"\s*".

James
Thank you for your help so far, it has been useful but i haven't quite
gotten time to figure it out. In the mean time i was posting in a
different forum and got given some help (to define a "point" class) I
took that advice and am now getting an error relating to it that i
have no idea how to fix and was wondering if you might be able to give
me a hand.

Anyways heres my error:
************************************************** ************************************************** ********************
***File "C:/Documents and Settings/Eric/Desktop/Python/2d guessing
game.py", line 11, in <module>***
*** randp = Point(random.randint(1, 20), random.randint(1,
20)) ***
***TypeError: default __new__ takes no
parameters
***
************************************************** ************************************************** ********************
and heres my code:

************************************************** ************************************************** ********************
#Import Random Module
import random

#classify "Point"
class Point(object):
def _init_(self, x, y):
self.x = x
self.y = y

#generate random coordinate point
randp = Point(random.randint(1, 20), random.randint(1, 20))

#print randp

#get user input
x = int(raw_input("Enter guessed x value (1-20): "))
y = int(raw_input("Enter guessed y value (1-20): "))

#compare input to randomly generated point
attempts = 0

while True:
userp = Point(x, y)
attempts += 1

if userp.y == randp.y and userp.x == randp.x:
print "You got it right!"
break

elif userp.y == randp.y:
if userp.y randp.x:
print "Go west"
elif userp.x < randp.x:
print "Go east"
x = int(raw_input("Enter new x guess: "))
userp = Point(x, y)

elif userp.y < randp.y:
if userp.x randp.x:
print "Go northwest"
elif userp.x < randp.x:
print "Go northeast"
x = int(raw_input("Enter new x guess: "))
y = int(raw_input("Enter new y guess: "))
userp = Point(x, y)

elif userp.x == randp.x:
if userp.y randp.y:
print "Go south"
elif userp.y < randp.y:
print "Go north"
y = int(raw_input("Enter new y guess: "))
userp = Point(x, y)

print " "
print "Number of guesses", attempts
************************************************** ************************************************** ********************

Feb 6 '07 #6
Er*************@gmail.com wrote:
class Point(object):
def _init_(self, x, y):
The name of the __init__ method needs *two* underscores
at each end, i.e.

def __init__(self, x, y):

--
Greg
Feb 7 '07 #7
En Tue, 06 Feb 2007 20:35:43 -0300, <Er*************@gmail.comescribió:
Anyways heres my error:
************************************************** ************************************************** ********************
***File "C:/Documents and Settings/Eric/Desktop/Python/2d guessing
game.py", line 11, in <module>***
*** randp = Point(random.randint(1, 20), random.randint(1,
20)) ***
***TypeError: default __new__ takes no
parameters
***
class Point(object):
def _init_(self, x, y):
self.x = x
self.y = y

#generate random coordinate point
randp = Point(random.randint(1, 20), random.randint(1, 20))

_init_ should be __init__ (two leading and trailing underscores)
That special method is used to initialize your newly constructed Point
instance.
See section 9.3.2 on the Python tutorial:
http://docs.python.org/tut/node11.ht...00000000000000
--
Gabriel Genellina

Feb 7 '07 #8
On Feb 6, 4:08 pm, "Gabriel Genellina" <gagsl...@yahoo.com.arwrote:
En Tue, 06 Feb 2007 20:35:43 -0300, <Eric.Gabriel...@gmail.comescribió:
Anyways heres my error:
************************************************** ************************************************** ********************
***File "C:/Documents and Settings/Eric/Desktop/Python/2d guessing
game.py", line 11, in <module>***
*** randp = Point(random.randint(1, 20), random.randint(1,
20)) ***
***TypeError: default __new__ takes no
parameters
***
class Point(object):
def _init_(self, x, y):
self.x = x
self.y = y
#generate random coordinate point
randp = Point(random.randint(1, 20), random.randint(1, 20))

_init_ should be __init__ (two leading and trailing underscores)
That special method is used to initialize your newly constructed Point
instance.
See section 9.3.2 on the Python tutorial:http://docs.python.org/tut/node11.ht...00000000000000

--
Gabriel Genellina
WOW thank you so much I feel like a blind idiot *slaps self on
forehead*

Feb 7 '07 #9
Expand|Select|Wrap|Line Numbers
  1. #classify "Point"
  2. class Point(object):
  3. def _init_(self, x, y):  <--- This is your problem
  4. self.x = x
  5. self.y = y
  6.  
That should be '__init__'. Two underscores before and after. But,
IMHO, I don't think a class is really necessary unless you are going
to build in compare facilities. You might as well just use a tuple:

Expand|Select|Wrap|Line Numbers
  1. from random import randint
  2. pt = (randint(1,20),randint(1,20))
  3. ....
  4. x,y = pt
  5. x = pt[0]
  6. y = pt[1]
  7.  
Feb 7 '07 #10

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