** Python Support Thread ** - Page 37 - Programming -- Two Plus Two Poker Forums

unluckyboy · 06-19-2012, 08:16 PM

here is a programming problem i am having a problem with. i have data for 1300 football games. for each game i have the spread, and what the result was compared to the spread. it is set up as a list of lists now [(game1_spread, game1_result_compared_to_spread), (game2_spread, game2_result_compared_to_spread), etc.]

i want to take this information and make a printout with these two pieces of data:

spread: game1_result_compared_to_spread==0/total_games_with_this_spread
spread2: game1_result_compared_to_spread==0/total_games_with_this_spread
etc. for each spread

how can i get this?

unluckyboy · 06-19-2012, 09:09 PM

okay did it i will post solution and appreciate feedback

Acemanhattan · 06-21-2012, 02:28 PM

Brand new to programming, just started going through the MIT opencourse and have some questions regarding Python.

If I open "Python Shell" and from there open "New Window" is this where I will be writing my programs? I then save it there and use the F5 function to run it in the shell correct?

Why when I am using that "New Window" does it automatically indent sentences that I don't think it should? For example I type the following for the first line:

outstanding_balance = int(raw_input("What is your outstanding balance?")

When I press enter it indents me about 7 tab spaces on the next line like:

outstanding_balance = int(raw_input("What is your outstanding balance?")
print "What is your outstanding balance?"

also if I'm not mistaken my first command is saying that whatever the user inputs when prompted, it will be turned from a string into an integer correct? And the second command should print the prompt for the user, correct?

When I try to run that code I get a syntax error.

Edit to add: 2+2 isn't displaying the indent the way I'm intending to show it, imagine "print" starting directly under "raw_input"

Colombo · 06-21-2012, 04:28 PM

Quote:

Originally Posted by Acemanhattan

Brand new to programming, just started going through the MIT opencourse and have some questions regarding Python.

If I open "Python Shell" and from there open "New Window" is this where I will be writing my programs? I then save it there and use the F5 function to run it in the shell correct?

Why when I am using that "New Window" does it automatically indent sentences that I don't think it should? For example I type the following for the first line:

outstanding_balance = int(raw_input("What is your outstanding balance?")

When I press enter it indents me about 7 tab spaces on the next line like:

outstanding_balance = int(raw_input("What is your outstanding balance?")
print "What is your outstanding balance?"

also if I'm not mistaken my first command is saying that whatever the user inputs when prompted, it will be turned from a string into an integer correct? And the second command should print the prompt for the user, correct?

When I try to run that code I get a syntax error.

Edit to add: 2+2 isn't displaying the indent the way I'm intending to show it, imagine "print" starting directly under "raw_input"

Ok, for starters I'm not quite sure what you mean by "Python shell" and "New Window", but I can answer your other questions.

As for this line:

Code:

outstanding_balance = int(raw_input("What is your outstanding balance?")

The indent is happening because your parenthesis aren't balanced. You need one ")" to close the "raw_input(" function, and another ")" to close the "int(" function.

Quote:

also if I'm not mistaken my first command is saying that whatever the user inputs when prompted, it will be turned from a string into an integer correct? And the second command should print the prompt for the user, correct?

When I try to run that code I get a syntax error.

Yes you are correct. The int() function will convert an object (in this case a String) into an integer. Hint: Type "help(int())" in your python shell.

The reason you are getting an error could be for a few reasons. As I said before you need to close your open parenthesis. In addition, the int() function will only work on a properly formatted String.

Try the following:
int('1')
int('3.4')
int('two')

Xhad · 06-21-2012, 05:22 PM

Quote:

Originally Posted by tyler_cracker

preventing incest is gay? these kids today...

That reminded me of this exchange for some reason...

tyler_cracker · 06-22-2012, 12:02 AM

hahahahha

Quote:

If that 6 were really a 9 and we were playing lowball and a 7 turns then I would have bottom pair which would be like top pair so I call

Quote:

A7 is not the nut seven-high, it's the 5th-nut Ace high. Duh.

MUCH LOVE FROM ME.

fluorescenthippo · 06-22-2012, 10:59 PM

Quote:

Originally Posted by Acemanhattan

Brand new to programming, just started going through the MIT opencourse and have some questions regarding Python.

If I open "Python Shell" and from there open "New Window" is this where I will be writing my programs? I then save it there and use the F5 function to run it in the shell correct?

Yea im doing this course too and thought the compiler they use seems kinda crappy unless im missing something.

i do the same as you but i dont know how to run the debugger from a new window and a few other things.

unluckyboy · 06-23-2012, 12:46 AM

god i hate elementtree and namespaces

tyler_cracker · 06-23-2012, 12:49 AM

heh, and you're just scraping it. imaging trying to write it!

unluckyboy · 06-23-2012, 01:02 AM

http://odds.sbrfeeds.com/events/?new...d&version=1.0&

can i get some help here, i have this page. how can i access the elements <side-name> using Xpath? how can i get access the element <side-name> where it's text equals "Jacksonville"

unluckyboy · 06-23-2012, 01:05 AM

i am trying tree.xpath("//{http://odds.sbrforum.com}side-name"), and root.xpath("//{http://odds.sbrforum.com}side-name"), tree.xpath("//{http://odds.sbrforum.com}:side-name"), and root.xpath("//side-name")

none work

unluckyboy · 06-23-2012, 01:08 AM

when i try to grab some random element and do tree.getpath(random_element) it gives me bull**** paths like /*/*[1]

what the hell is that

Alex Wice · 06-23-2012, 05:10 AM

Quote:

Originally Posted by unluckyboy

here is a programming problem i am having a problem with. i have data for 1300 football games. for each game i have the spread, and what the result was compared to the spread. it is set up as a list of lists now [(game1_spread, game1_result_compared_to_spread), (game2_spread, game2_result_compared_to_spread), etc.]

i want to take this information and make a printout with these two pieces of data:

spread: game1_result_compared_to_spread==0/total_games_with_this_spread
spread2: game1_result_compared_to_spread==0/total_games_with_this_spread
etc. for each spread

how can i get this?

I might not have understood your question btw.

Code:

def avgspread(sp,lt):
   #given a spread, and a list of games [ (spread,result),... ]
   # , return the average result compared to spread
   ans,ct = 0,0
   for i in lt:
       if i[0] == sp:
         ans += i[1]
         ct += 1
   return ans/float(ct)

fluorescenthippo · 06-30-2012, 12:24 PM

taking the MIT python course and came across this:

self.viruses = [x for x in newViruses]

can someone please explain to me how this is better than a typical for loop. I'm also uncertain as to what this does

Xhad · 06-30-2012, 12:45 PM

That's called a list comprehension. In this case it's just copying the list. The equivalent as a for would be:

Code:

self.viruses = []
for x in newViruses:
    self.viruses.append(x)

The main advantage is code length and readability once you understand it; see my response to this post