Python object oriented programming (lab2) (2)

Jul 27, 2012Download as pptx, pdf

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The document discusses object oriented programming concepts like classes, objects, and methods. It provides examples of creating classes for shapes like squares and triangles, and using them to calculate the total area of an irregular shape composed of other shapes. Further examples demonstrate creating a class to represent a square matrix and methods to add numbers to it or combine matrices through addition. Exercises expand on these concepts by adding methods for matrix multiplication and combining multiple matrices through repeated addition.

Play with Python
Lab2
Object Oriented Programming

About Lecture 2 and Lab 2
Lecture 2 and its lab aims at covering Basic
Object Oriented Programming concepts
Classes, Constructor (__init__) and Objects

Example 1
Create a new Project in
shp1 = IrregularShape()
Aptana "Lab2", then shp1.AddShape(Square(3))

add a new PyDev shp1.AddShape(Triangle(4, 5))
shp1.AddShape(Square(10))
module called main print shp1.Area()

Write the following code ========
in your main file: Output:
119.0
class Square:
def __init__(self, l):
self.length = l
def Area(self):
return self.length**2
class Triangle:
def __init__(self, b, h):

Example 1
class Square:
def __init__(self, l):
self.length = l
def Area(self):
return self.length**2
class Triangle:
def __init__(self, b, h):
self.base = b
self.height = h
def Area(self):
return 0.5*self.base*self.height

Example 1
class IrregularShape:
def __init__(self):
self.shapes = []
def AddShape(self, shape):
self.shapes.append(shape)
def Area(self):
area = 0
for shape in self.shapes:
area += shape.Area()
return area

Example 1

shp1 = IrregularShape()
shp1.AddShape(Square(3))
shp1.AddShape(Triangle(4, 5))
shp1.AddShape(Square(10))
print shp1.Area()

========
Output:
119.0

Exercise 1 (5 Minutes)
Add another IrregularShape that has double
the area of shp1 in the previous example,
ONLY by using shp1 object that you have
just created, not using any other shapes

Exercise 1 (Solution)
shp2 = IrregularShape()
shp2.AddShape(shp1)
shp2.AddShape(shp1)
print shp2.Area()

=====
Output:
238.0

Example 2
Type this SquareMatrix def addNumber(self, number):
resultMatrix = SquareMatrix()
class in your main file:
matrixDimension = len(self.matrix)

for rowIndex in range(0,matrixDimension):
#square matrix only
newRow = []
class SquareMatrix:
for columnIndex in range(0,matrixDimension):
def __init__(self):
self.matrix = [] newRow.append(self.matrix[rowIndex][columnIndex] +
number)
def appendRow(self, row): resultMatrix.appendRow(newRow)
self.matrix.append(row)
return resultMatrix
def printMatrix(self):
for row in self.matrix:
Output:
================================ [-1, 1]
print row mat = SquareMatrix() [8, 4]
mat.appendRow([0, 2])
mat.appendRow([9, 5])
mat.addNumber(-1)

Example 2
#square matrix only
class SquareMatrix:
def __init__(self):
self.matrix = []

def appendRow(self, row):
self.matrix.append(row)

def printMatrix(self):
for row in self.matrix:
print row

Example 2
def addNumber(self, number):
resultMatrix = SquareMatrix()
matrixDimension = len(self.matrix)

for rowIndex in range(0,matrixDimension):
newRow = []
for columnIndex in range(0,matrixDimension):
newRow.append(self.matrix[rowIndex][columnIndex] + number)
resultMatrix.appendRow(newRow)

return resultMatrix
================================
mat = SquareMatrix() Output:
mat.appendRow([0, 2]) [-1, 1]
[8, 4]
mat.appendRow([9, 5])
mat.addNumber(-1)
mat.printMatrix()

Example 2
This class represents a square matrix (equal row, column dimensions),
the add number function

matrix data is filled by row, using the appendRow() function

addNumber() function adds a number to every element in the matrix

Exercise 2 (10 minutes)
Add a new fucntion add() that returns a new
matrix which is the result of adding this matrix
with another matrix:

mat1 = SquareMatrix()
mat1.appendRow([1, 2]) 1 2 1 -2 2 0
mat1.appendRow([4, 5])
4 5 -5 1 -1 6
mat2 = SquareMatrix()
mat2.appendRow([1, -2])
mat2.appendRow([-5, 1])

mat3 = mat1.add(mat2)
mat3.printMatrix()

Exercise 2 (Solution)
def add(self, otherMatrix):
resultMatrix = SquareMatrix()
matrixDimension = len(self.matrix)
for rowIndex in range(0,matrixDimension):
newRow = []
for columnIndex in range(0,matrixDimension):
newRow.append(self.matrix[rowIndex][columnIndex] + otherMatrix.matrix[rowIndex][columnIndex])
resultMatrix.appendRow(newRow)
return resultMatrix
=======================
mat1 = SquareMatrix() Fun: add 3 matrices in one line like this:
mat1.appendRow([1, 2]) mat1.add(mat2).add(mat3).printMatrix()
mat1.appendRow([4, 5])

mat2 = SquareMatrix()
mat2.appendRow([1, -2])
mat2.appendRow([-5, 1])

Exercise 3 (10 minutes)
Add a new function mutliplyNumber(t), which multiplies a positive
integer t to the matrix, ONLY using the add(othermatrix) method

1 -1 5 -5
-1 1 5 -5 5

Exercise 3 (Solution)
def multiplyNumber(self, times):
result = self
for i in range(0, times-1):
result = result.add(self)
return result
==========================

mat = SquareMatrix()
mat.appendRow([1, -1])
mat.appendRow([-1, 1])

mat.multiplyNumber(5)

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Python object oriented programming (lab2) (2)

1. Play with Python Lab2 Object Oriented Programming

2. About Lecture 2 and Lab 2 Lecture 2 and its lab aims at covering Basic Object Oriented Programming concepts Classes, Constructor (__init__) and Objects

3. Example 1 Create a new Project in shp1 = IrregularShape() Aptana "Lab2", then shp1.AddShape(Square(3)) add a new PyDev shp1.AddShape(Triangle(4, 5)) shp1.AddShape(Square(10)) module called main print shp1.Area() Write the following code ======== in your main file: Output: 119.0 class Square: def __init__(self, l): self.length = l def Area(self): return self.length**2 class Triangle: def __init__(self, b, h):

4. Example 1 class Square: def __init__(self, l): self.length = l def Area(self): return self.length**2 class Triangle: def __init__(self, b, h): self.base = b self.height = h def Area(self): return 0.5*self.base*self.height

5. Example 1 class IrregularShape: def __init__(self): self.shapes = [] def AddShape(self, shape): self.shapes.append(shape) def Area(self): area = 0 for shape in self.shapes: area += shape.Area() return area

6. Example 1 shp1 = IrregularShape() shp1.AddShape(Square(3)) shp1.AddShape(Triangle(4, 5)) shp1.AddShape(Square(10)) print shp1.Area() ======== Output: 119.0

7. Exercise 1 (5 Minutes) Add another IrregularShape that has double the area of shp1 in the previous example, ONLY by using shp1 object that you have just created, not using any other shapes

8. Exercise 1 (Solution) shp2 = IrregularShape() shp2.AddShape(shp1) shp2.AddShape(shp1) print shp2.Area() ===== Output: 238.0

9. Example 2 Type this SquareMatrix def addNumber(self, number): resultMatrix = SquareMatrix() class in your main file: matrixDimension = len(self.matrix) for rowIndex in range(0,matrixDimension): #square matrix only newRow = [] class SquareMatrix: for columnIndex in range(0,matrixDimension): def __init__(self): self.matrix = [] newRow.append(self.matrix[rowIndex][columnIndex] + number) def appendRow(self, row): resultMatrix.appendRow(newRow) self.matrix.append(row) return resultMatrix def printMatrix(self): for row in self.matrix: Output: ================================ [-1, 1] print row mat = SquareMatrix() [8, 4] mat.appendRow([0, 2]) mat.appendRow([9, 5]) mat.addNumber(-1)

10. Example 2 #square matrix only class SquareMatrix: def __init__(self): self.matrix = [] def appendRow(self, row): self.matrix.append(row) def printMatrix(self): for row in self.matrix: print row

11. Example 2 def addNumber(self, number): resultMatrix = SquareMatrix() matrixDimension = len(self.matrix) for rowIndex in range(0,matrixDimension): newRow = [] for columnIndex in range(0,matrixDimension): newRow.append(self.matrix[rowIndex][columnIndex] + number) resultMatrix.appendRow(newRow) return resultMatrix ================================ mat = SquareMatrix() Output: mat.appendRow([0, 2]) [-1, 1] [8, 4] mat.appendRow([9, 5]) mat.addNumber(-1) mat.printMatrix()

12. Example 2 This class represents a square matrix (equal row, column dimensions), the add number function matrix data is filled by row, using the appendRow() function addNumber() function adds a number to every element in the matrix

13. Exercise 2 (10 minutes) Add a new fucntion add() that returns a new matrix which is the result of adding this matrix with another matrix: mat1 = SquareMatrix() mat1.appendRow([1, 2]) 1 2 1 -2 2 0 mat1.appendRow([4, 5]) 4 5 -5 1 -1 6 mat2 = SquareMatrix() mat2.appendRow([1, -2]) mat2.appendRow([-5, 1]) mat3 = mat1.add(mat2) mat3.printMatrix()

14. Exercise 2 (Solution) def add(self, otherMatrix): resultMatrix = SquareMatrix() matrixDimension = len(self.matrix) for rowIndex in range(0,matrixDimension): newRow = [] for columnIndex in range(0,matrixDimension): newRow.append(self.matrix[rowIndex][columnIndex] + otherMatrix.matrix[rowIndex][columnIndex]) resultMatrix.appendRow(newRow) return resultMatrix ======================= mat1 = SquareMatrix() Fun: add 3 matrices in one line like this: mat1.appendRow([1, 2]) mat1.add(mat2).add(mat3).printMatrix() mat1.appendRow([4, 5]) mat2 = SquareMatrix() mat2.appendRow([1, -2]) mat2.appendRow([-5, 1])

15. Exercise 3 (10 minutes) Add a new function mutliplyNumber(t), which multiplies a positive integer t to the matrix, ONLY using the add(othermatrix) method 1 -1 5 -5 -1 1 5 -5 5

16. Exercise 3 (Solution) def multiplyNumber(self, times): result = self for i in range(0, times-1): result = result.add(self) return result ========================== mat = SquareMatrix() mat.appendRow([1, -1]) mat.appendRow([-1, 1]) mat.multiplyNumber(5)

Python object oriented programming (lab2) (2)

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