[Tutor] Need help in making this code more pythonic
Hello, I need some suggestions on how to make this code pythonic. The program basically runs a simulation of an object that moves on a 2D plane. The object keeps on moving from its current coordinate to randomly picked adjacent coordinates with the object is not allowed to move move to a previously covered coordinate point as the rule. If the object is unable to move the program will terminate. Some of the concerns I have in mind is the code in the move method in Person class. I am sure there are some built-in methods or features in python that I could use to improve the implementation of that method. Hope you guys can enlighten me. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Need help in making this code more pythonic
Sorry I forgot to attach the code file.
Here it is.
--- On Sun, 7/26/09, ammar azif ceasar...@yahoo.com wrote:
From: ammar azif ceasar...@yahoo.com
Subject: [Tutor] Need help in making this code more pythonic
To: tutor@python.org
Date: Sunday, July 26, 2009, 6:23 AM
Hello,
I need some suggestions on how to make this code pythonic. The program
basically runs a simulation of an object that moves on a 2D plane. The object
keeps on moving from its current coordinate to randomly picked adjacent
coordinates with the object is not allowed to move move to a previously covered
coordinate point as the rule. If the object is unable to move the program will
terminate. Some of the concerns I have in mind is the code in the move method
in Person class. I am sure there are some built-in methods or features in
python that I could use to improve the implementation of that method. Hope you
guys can enlighten me.
-Inline Attachment Follows-
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import random
import time
class Person(object):
def __init__(self, position,length,width):
self.positions = {position:None} #coordinates covered
self.position = position #current coordinate
self.length = length # world length
self.width= width #world width
def move(self):
x = self.position[0]
y = self.position[1]
#set dead end
cannot_move = True
#list of potential next coordinates
potential_positions =[]
if x+1=0 and x+1=self.length-1:
if not self.positions.has_key((x+1,y)):
cannot_move = False
potential_positions.append((x+1,y))
if x-1=0 and x-1=self.length-1:
if not self.positions.has_key((x-1,y)):
cannot_move = False
potential_positions.append((x-1,y))
if y-1=0 and y-1=self.width-1:
if not self.positions.has_key((x,y-1)):
cannot_move = False
potential_positions.append((x,y-1))
if y+1=0 and y+1=self.width-1:
if not self.positions.has_key((x,y+1)):
cannot_move = False
potential_positions.append((x,y+1))
if cannot_move :
#return value that signifies the person cannot move
return False
else:
#randomly pick a coordinate from list of potential coordinates
index=random.randrange(len(potential_positions))
self.positions[potential_positions[index]]=None
self.position = potential_positions[index]
return True
width = 10
length = 10
person = Person((0,0),length,width)
plots = {(0,0):None}
print 'Initial Positions Covered Count:'+str(len(person.positions))
print 'Moving!'
while person.move():
string = 'Current position:' + str(person.position)+'Total covered:'+str(len(person.positions))+'\n'
for x in range(width):
for y in range(length):
if person.positions.has_key((x,y)):
string+='X'
else:
string+=' '
if y==length-1:
string+='\n'
print string
time.sleep(1)
print 'Cannot move!'
print person.positions
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[Tutor] Puzzled
I wrote a python program that used time() function from the time module to retrieve time in seconds since Epoch. After the value was retrieved which I checked is a float by using type(), the value was then written into a file in binary format. Then another C program that I wrote opened the file and converted the value into a time_t variable but it was totally different from the correct value. Then I found that the time_t size is actually 4 byte integer which is not the same with 8-byte float value returned by time.time(). Why is this so? Being written with C library, isn't python suppose to work well with it? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Puzzled
Thanks for the explanation. Btw, How can I get the size of python primitive data types in bytes? Is it defined somewhere in a file that I can look at? --- On Fri, 8/29/08, Kent Johnson [EMAIL PROTECTED] wrote: From: Kent Johnson [EMAIL PROTECTED] Subject: Re: [Tutor] Puzzled To: [EMAIL PROTECTED] Cc: tutor@python.org Date: Friday, August 29, 2008, 4:41 PM On Fri, Aug 29, 2008 at 5:13 PM, ammar azif [EMAIL PROTECTED] wrote: I wrote a python program that used time() function from the time module to retrieve time in seconds since Epoch. After the value was retrieved which I checked is a float by using type(), the value was then written into a file in binary format. Then another C program that I wrote opened the file and converted the value into a time_t variable but it was totally different from the correct value. Then I found that the time_t size is actually 4 byte integer which is not the same with 8-byte float value returned by time.time(). Why is this so? Being written with C library, isn't python suppose to work well with it? The C time_t type is very loosely specified; in ANSI C it is only required to be an arithmetic type. According to Wikipedia (http://en.wikipedia.org/wiki/Time_t), Posix-compliant systems still have latitude to implement it as 32 or 64 bits. Python tries to be bit higher level, giving you fractional seconds if the implementation supports it and a common data type across implementations. So there is not an exact match in functionality. If you want to write data to file in a format that can be read by another program, you should look at the struct module. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] My experience on web.py
Hi, I am writing this to tell my experience on web.py. Two weeks ago, I was looking for a python web framework that is simple, straight-forward, easy to use and powerful at the same time. Django stood out as the most popular when I googled. I tried to use django but I found that the framework hides alot of things from me and files are generated by the framework automaticaly and I felt like I wasnt in control. I know that django is powerful, but the learning curve is too steep for me and I need to develop my app as soon as possible. I decided to give web.py a try and I found that the framework is easy to use and it gives a lot of control to the developer when handling GET and POST request and all these can be done in a single source code and using this framework has taught me a lot of low level web application programming basics. I might be wrong as I havent try django or any other frameworks yet. Hope python gurus here can share their thoughts on these matters, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
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[Tutor] help on raw_input()
Hi,
i wanted to get a string from raw_input like this
raw_input('')
\n\nsomestring
but the problem is raw input will return the string
'\\n\\nsomestring'
My question is
Are there any function to convert back those string to '\n\nsomestring' ?
Thanks
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Re: [Tutor] help on raw_input()
Actually i wanted to write a http client using just he low level socket module.
The program will prompt the user asking for input and the use will type http
commands like 'GET /index.html HTTP/1.0\r\nHost: somehost\r\n\r\n'
when i use the raw_input function , the string that i get is
'GET /index.html HTTP/1.0\\r\\nHost: somehost\\r\\n\\r\\n'
is there any easy way other than modify this string ? Perhaps regular
expression?
Alan Gauld [EMAIL PROTECTED] wrote: ammar azif wrote
i wanted to get a string from raw_input like this
raw_input('')
\n\nsomestring
OK, Can you explain precisely what you want the string to contain.
\n is the string representation of a newline. Do you want to enter
something that starts with two newlines? Or do you literally want
the sequence \,n,\,n?
If its the latter thats what Python has stored. The double slash
is only there when python displays the result (Try using len and
comparing if you aren't convinced)
If you want to actually capture newline characters from raw_input,
thats more tricky. But before we get to that can you clarify what
you actually want?
Alan G.
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Re: [Tutor] help on raw_input()
Thanks the encode method really helps. Alan Gauld [EMAIL PROTECTED] wrote: ammar azif wrote Actually i wanted to write a http client using just he low level socket module. I won;t ask why! But the httplib module probably does what you want just in case you dodn't realize it existed... The program will prompt the user asking for input and the use will type http commands like 'GET /index.html HTTP/1.0\r\nHost: somehost\r\n\r\n' OK, So you want the user to acrtually type \,n,\,n and you will then send that string to be interpreted as newlines? when i use the raw_input function , the string that i get is 'GET /index.html HTTP/1.0\\r\\nHost: somehost\\r\\n\\r\\n' The double \\ doesn''t actually exist its just Python telling you that it is a literal \ character not an escaped sequence. As I said earlier if you check the len() of the string it will only have one character per backslash. I think it's already doing what you want! You just need to turn the \n's that the user entered into newline characters, Kent has shown you how to do that with the decode() method... -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor - Ahhh...imagining that irresistible new car smell? Check outnew cars at Yahoo! Autos.___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
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[Tutor] Built-in function to check a character is ASCII character?
Is there any Built-in function to check whether a character is an ASCII character? I am trying to learn event driven programming in python. Heres my code: while 1: key=msvcrt.getch() if key==255: continue else: print the key is , key But the output is:- the key is ÿ the key is ÿ the key is ÿ the key is ÿ the key is ÿ the key is ÿ the key is ÿ the key is ÿ(infinite loop) Why is this happening ? what is the ÿ character? - Now that's room service! Choose from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit.___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
