Programming Forums > Script Programming > Python

Sane · Apr 27th, 2005, 9:26 PM

I guess I should start understanding classes better.

So could anyone write me a program that takes an image of a line and rotates it in a circle pivoting on one side. And printing the [x,y] of the opposite side of the pivot (in a class).

This would help me immensely, thanks.

P.S. If you don't know how to use the pygame.rotate thingy, and know how to do classes. Could you go to the Lounge and in the "500 ways to program numbers 1 through 10" do one using classes?

Ooble · Apr 28th, 2005, 1:45 PM

It's a waste of space, but here you go (this is in C++):

(Toggle Plain Text)

#include <iostream>
using namespace std;

class Number
{
private:
    int num;
    
    // this is a constructor - it's executed as soon as the class is created.
    Number ()
    {
        num = 0;
    }
    
    // this is a destructor - it's executed when the class is destroyed.
    ~Number ()
    {
    }
    
public:
    int getNum ()
    {
        return num;
    }
    
    void setNum (int newNum)
    {
        num = newNum;
    }
    
    void printNum ()
    {
        cout << num << endl;
    }
    
    void incrementNum ()
    {
        num++;
    }
}

int main ()
{
    Number num; // this creates a new instance of the class called "num"
    
    while (num.getNum() <= 10)
    {
        num.incrementNum();
        num.printNum();
    }
    
    return 0;
}

NB: this is untested. Enjoy!

Infinite Recursion · Apr 28th, 2005, 1:48 PM

I could be mistaken, but I thought he wanted this in Python??

Ooble · Apr 28th, 2005, 1:52 PM

I don't know how classes work in Python. :p

Sane · Apr 28th, 2005, 8:59 PM

I think I've got it down thanks to Hydroxide.

My record for running this program is 1000. See what you can get without altering the code. :p

(Toggle Plain Text)

import random

class Range(object):

    def __init__(self, txt, end):
        self.txt = txt-1
        self.end = end
        self.count = 0

    def add(self):
        self.txt += 1
        self.count += 1

    def kill_digit(self):
        self.txt = int(str(self.txt)[1:])

    def add_digit(self):
        self.txt = int(str(random.randrange(0,10))+str(self.txt))

    def randomize(self):
        self.txt += random.randrange(0, 10)

    def run(self):
        while series.txt != series.end:
            
            self.add()
            
            if self.txt > 991:
                self.kill_digit()
            elif self.txt < 100:
                self.add_digit()
            else:
                self.randomize()
                    
series = Range(1, 1000) ; series.run()
print "Took", series.count, "tries to get to", "%s%s"%(series.txt,".")

I modified it to loop through and return the least amount of tries it needed to do: 8. :eek:

(Toggle Plain Text)

import random

class Range(object):
    def __init__(self, txt, end):
        self.txt = txt-1
        self.end = end
        self.count = 0

    def add(self):
        self.txt += 1
        self.count += 1

    def kill_digit(self):
        self.txt = int(str(self.txt)[1:])

    def add_digit(self):
        self.txt = int(str(random.randrange(0,10))+str(self.txt))

    def randomize(self):
        self.txt += random.randrange(0, 10)

    def run(self):
        while series.txt != series.end:  
            self.add()
            
            if self.txt > 991:
                self.kill_digit()
            elif self.txt < 100:
                self.add_digit()
            else:
                self.randomize()

x=[]

for a in range(100):                    
    series = Range(1, 1000) ; series.run()
    x.append(series.count)
    
smallest = 9999999
biggest = 0

for a in range(len(x)):
    if x[a] < smallest: smallest = x[a]
    if x[a] > biggest : biggest  = x[a]
print "%d and %d are the smallest and biggest amount of triest to get to %s."%(smallest, biggest, series.txt)

hydroxide · Apr 28th, 2005, 11:16 PM

1/ Don't use "txt" to hold a number - it's confusing.
2/ Rather than adding and removing digits from the left of a number, add and remove them from the right. This will allow you to use multiplication and division rather than conversions to strings
3/ You can replace the smallest and biggest code with calls to min() and max()

--OH.

Sane · Apr 29th, 2005, 6:53 AM

Adding and removing digits from the right would take just as much multiplication/division with strings as from the left.

Adding digit:
self.txt = int(str(self.txt) + str(random.randrange(0,10)))

Removing digit:
self.txt = int(str(self.txt)[0:len(self.txt)-2])

And why should it matter anyways, if the program really has no point, and digits are generally added and removed from the left. o_O??

hydroxide · Apr 29th, 2005, 8:36 AM

Quote:

Originally Posted by Sane

Adding and removing digits from the right would take just as much multiplication/division with strings as from the left.

Adding digit:
self.txt = int(str(self.txt) + str(random.randrange(0,10)))

Removing digit:
self.txt = int(str(self.txt)[0:len(self.txt)-2])

Erm... no - if you go from the right you don't need strings - a huge difference in beauty/brevity:

(Toggle Plain Text)

    def kill_digit(self):
        self.val //= 10

    def add_digit(self):
        self.val *= 10
        self.randomize()

Quote:

And why should it matter anyways, if the program really has no point, and digits are generally added and removed from the left. o_O??

Because good habits matter when your programs do have a point, and pretty code is generally easier to maintain/improve.

--OH.

Sane · Apr 29th, 2005, 1:50 PM

By no point, I meant no point to distinguish it from the digits needing to be removed from either left or right. But okay.

Apr 27th, 2005, 9:26 PM	#1
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	Classes I guess I should start understanding classes better. So could anyone write me a program that takes an image of a line and rotates it in a circle pivoting on one side. And printing the [x,y] of the opposite side of the pivot (in a class). This would help me immensely, thanks. P.S. If you don't know how to use the pygame.rotate thingy, and know how to do classes. Could you go to the Lounge and in the "500 ways to program numbers 1 through 10" do one using classes? Last edited by Sane; Apr 27th, 2005 at 9:38 PM.

Apr 28th, 2005, 1:45 PM	#2
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	It's a waste of space, but here you go (this is in C++): (Toggle Plain Text) #include <iostream> using namespace std; class Number { private: int num; // this is a constructor - it's executed as soon as the class is created. Number () { num = 0; } // this is a destructor - it's executed when the class is destroyed. ~Number () { } public: int getNum () { return num; } void setNum (int newNum) { num = newNum; } void printNum () { cout << num << endl; } void incrementNum () { num++; } } int main () { Number num; // this creates a new instance of the class called "num" while (num.getNum() <= 10) { num.incrementNum(); num.printNum(); } return 0; } #include <iostream> using namespace std; class Number { private: int num; // this is a constructor - it's executed as soon as the class is created. Number () { num = 0; } // this is a destructor - it's executed when the class is destroyed. ~Number () { } public: int getNum () { return num; } void setNum (int newNum) { num = newNum; } void printNum () { cout << num << endl; } void incrementNum () { num++; } } int main () { Number num; // this creates a new instance of the class called "num" while (num.getNum() <= 10) { num.incrementNum(); num.printNum(); } return 0; } NB: this is untested. Enjoy! __________________ Me :: You :: Them

Apr 28th, 2005, 1:48 PM	#3
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,473 Rep Power: 8	I could be mistaken, but I thought he wanted this in Python?? __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Apr 28th, 2005, 1:52 PM	#4
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	I don't know how classes work in Python. :p __________________ Me :: You :: Them

Apr 28th, 2005, 8:59 PM	#5
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	I think I've got it down thanks to Hydroxide. My record for running this program is 1000. See what you can get without altering the code. :p (Toggle Plain Text) import random class Range(object): def __init__(self, txt, end): self.txt = txt-1 self.end = end self.count = 0 def add(self): self.txt += 1 self.count += 1 def kill_digit(self): self.txt = int(str(self.txt)[1:]) def add_digit(self): self.txt = int(str(random.randrange(0,10))+str(self.txt)) def randomize(self): self.txt += random.randrange(0, 10) def run(self): while series.txt != series.end: self.add() if self.txt > 991: self.kill_digit() elif self.txt < 100: self.add_digit() else: self.randomize() series = Range(1, 1000) ; series.run() print "Took", series.count, "tries to get to", "%s%s"%(series.txt,".") import random class Range(object): def __init__(self, txt, end): self.txt = txt-1 self.end = end self.count = 0 def add(self): self.txt += 1 self.count += 1 def kill_digit(self): self.txt = int(str(self.txt)[1:]) def add_digit(self): self.txt = int(str(random.randrange(0,10))+str(self.txt)) def randomize(self): self.txt += random.randrange(0, 10) def run(self): while series.txt != series.end: self.add() if self.txt > 991: self.kill_digit() elif self.txt < 100: self.add_digit() else: self.randomize() series = Range(1, 1000) ; series.run() print "Took", series.count, "tries to get to", "%s%s"%(series.txt,".") I modified it to loop through and return the least amount of tries it needed to do: 8. :eek: (Toggle Plain Text) import random class Range(object): def __init__(self, txt, end): self.txt = txt-1 self.end = end self.count = 0 def add(self): self.txt += 1 self.count += 1 def kill_digit(self): self.txt = int(str(self.txt)[1:]) def add_digit(self): self.txt = int(str(random.randrange(0,10))+str(self.txt)) def randomize(self): self.txt += random.randrange(0, 10) def run(self): while series.txt != series.end: self.add() if self.txt > 991: self.kill_digit() elif self.txt < 100: self.add_digit() else: self.randomize() x=[] for a in range(100): series = Range(1, 1000) ; series.run() x.append(series.count) smallest = 9999999 biggest = 0 for a in range(len(x)): if x[a] < smallest: smallest = x[a] if x[a] > biggest : biggest = x[a] print "%d and %d are the smallest and biggest amount of triest to get to %s."%(smallest, biggest, series.txt) import random class Range(object): def __init__(self, txt, end): self.txt = txt-1 self.end = end self.count = 0 def add(self): self.txt += 1 self.count += 1 def kill_digit(self): self.txt = int(str(self.txt)[1:]) def add_digit(self): self.txt = int(str(random.randrange(0,10))+str(self.txt)) def randomize(self): self.txt += random.randrange(0, 10) def run(self): while series.txt != series.end: self.add() if self.txt > 991: self.kill_digit() elif self.txt < 100: self.add_digit() else: self.randomize() x=[] for a in range(100): series = Range(1, 1000) ; series.run() x.append(series.count) smallest = 9999999 biggest = 0 for a in range(len(x)): if x[a] < smallest: smallest = x[a] if x[a] > biggest : biggest = x[a] print "%d and %d are the smallest and biggest amount of triest to get to %s."%(smallest, biggest, series.txt) Last edited by Sane; Apr 28th, 2005 at 9:10 PM.

Apr 28th, 2005, 11:16 PM	#6
hydroxide Programmer Join Date: Apr 2005 Posts: 73 Rep Power: 4	1/ Don't use "txt" to hold a number - it's confusing. 2/ Rather than adding and removing digits from the left of a number, add and remove them from the right. This will allow you to use multiplication and division rather than conversions to strings 3/ You can replace the smallest and biggest code with calls to min() and max() --OH.

Apr 29th, 2005, 6:53 AM	#7
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	Adding and removing digits from the right would take just as much multiplication/division with strings as from the left. Adding digit: self.txt = int(str(self.txt) + str(random.randrange(0,10))) Removing digit: self.txt = int(str(self.txt)[0:len(self.txt)-2]) And why should it matter anyways, if the program really has no point, and digits are generally added and removed from the left. o_O??

Apr 29th, 2005, 1:50 PM	#9
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	By no point, I meant no point to distinguish it from the digits needing to be removed from either left or right. But okay.

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Programming Forums > Script Programming > Python

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