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Python: A class constructed by a radius and two methods which will compute the area and the perimeter of a circle

Python Class: Exercise-11 with Solution

Write a Python class named Circle constructed by a radius and two methods which will compute the area and the perimeter of a circle.

Sample Solution:

Python Code:

class Circle():
    def __init__(self, r):
        self.radius = r

    def area(self):
        return self.radius**2*3.14
    
    def perimeter(self):
        return 2*self.radius*3.14

NewCircle = Circle(8)
print(NewCircle.area())
print(NewCircle.perimeter())

Sample Output:

200.96                                                                                                        
50.24

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Python: A class constructed by a radius and two methods which will compute the area and the perimeter of a circle.

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Flowchart: A class constructed by a radius and two methods which will compute the area and the perimeter of a circle

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Previous: Write a Python class named Rectangle constructed by a length and width and a method which will compute the area of a rectangle.
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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m