Functions and Classes

Follow along: Functions and Classes

The program launching process along with parameter settings are all simplified and set up on the Jupyter Notebook Environment.

Create a new *.ipynb file Jupyter Notebook
Fill in the content below in the newly created file
Follow and Execute the example codes

(The Jetson Board used for these examples are => Jetson Nano)

Let’s write the following examples.

Functions

# 1
def sum(a, b):
    return a + b

a = 1
b = 2
c = sum(a, b)
print('c:', c)

# 2
def sum(a, b):
    result = a + b
    return result

a = 1
b = 2
c = sum(a, b)
print('c:', c)

# 3
def say():
    print('Say "Hello" to my little friend!')

say()

# 4
def say(text):
    print('Say "%s" to my little friend!' %(text))

say("Good bye")

# 5
def say_hello(say, text='Hello'):
    if say:
        print('Say "%s" to my little friend!' % (text))
    else:
        print('Say nothing to my little friend!')

input_text = input("Enter a text: ")
say_hello(input_text)

# 6
import sys

def say_hello(say, text='Hello'):
    if say:
        print('Say "%s" to my little friend!' % (text))
    else:
        print('Say nothing to my little friend!')

if len(sys.argv) >= 2:
    input_text = sys.argv[1]

else:
    input_text = ''

say_hello(input_text)

# 7
def life_quote():
    a1 = "All work and no play"
    b1 = " makes Jack a dull boy.\n"
    c1 = 3
    return a1, b1, c1

a2, b2, c2 = life_quote()
print((a2 + b2) * 3)

# 8
name = 'Jack Torrance'

def called_me_1():
    name = 'Johnny'
    return name

called_me_1()
print("Here's (%s)!" %(name))

def called_me_2():
    global name
    name = 'Johnny'
    return name

called_me_2()
print("Here's (%s)!" %(name))

Classes

# 1
class Calculator:
    def adder(self, num_1, num_2):
        result = num_1 + num_2
        print('%s + %s = %s' %(num_1, num_2, result))


    def subtractor(self, num_1, num_2):
        result = num_1 - num_2
        print('%s - %s = %s' %(num_1, num_2, result))

calc = Calculator()

calc.adder(2, 1)
calc.subtractor(2, 1)

# 2
class Calculator:
    def __init__(self):
        self.result = 0

    def adder(self, num_1, num_2):
        self.result = num_1 + num_2
        return self.result


    def subtractor(self, num_1, num_2):
        self.result = num_1 - num_2
        return self.result

calc = Calculator()

num = [2, 1]
print('%s + %s = %s' %(num[0], num[1], calc.adder(num[0], num[1])))
print('%s - %s = %s' %(num[0], num[1], calc.subtractor(num[0], num[1])))

# 3
class Say:
    def first_one(self, thing_1):
        self.thing_1 = thing_1

    def last_one(self, thing_2):
        self.thing_2 = thing_2

    def say(self):
        print('The %s is %s!' %(self.thing_1, self.thing_2))

say = Say()

say.thing_1 = 'World'
say.thing_2 = 'Yours'
say.say()

# 4
class Say:
    def __init__(self):
        self.thing_2 = 'Yours'

    def first_one(self, thing_1):
        self.thing_1 = thing_1

    def last_one(self, thing_2):
        self.thing_2 = thing_2

    def say(self):
        print('The %s is %s!' %(self.thing_1, self.thing_2))

say = Say()

say.thing_1 = 'World'
say.say()
say.thing_2 = 'Mine'
say.say()

# 5
class Say:
    def __init__(self, thing_1, thing_2):
        self.thing_1 = thing_1
        self.thing_2 = thing_2

    def first_one(self, thing_1):
        self.thing_1 = thing_1

    def last_one(self, thing_2):
        self.thing_2 = thing_2

    def say(self):
        print('The %s is %s!' %(self.thing_1, self.thing_2))

say = Say("World", "Yours")
say.say()
say.thing_2 = "Mine"
say.say()

# 6
class Calc:
    def set_num(self, num_1, num_2):
        self.num_1 = num_1
        self.num_2 = num_2

    def sum(self):
        result = self.num_1 + self.num_2
        return result

    def sub(self):
        result = self.num_1 - self.num_2
        return result

    def mul(self):
        result = self.num_1 * self.num_2
        return result

    def div(self):
        result = self.num_1 / self.num_2
        return result

calc = Calc()

calc.set_num(4, 2)
print(calc.sum())
print(calc.sub())
print(calc.mul())
print(calc.div())

# 7
class Jack:
    last_name = "Torrance"

    def __init__(self, name):
        self.full_name = name + ' ' +  self.last_name

    def trip(self, place):
        print("%s's family is going on a trip to %s." % (self.full_name, place))

    def __add__(self, other):
        print("%s and %s are married to each other." % (self.full_name, other.full_name))

    def __sub__(self, other):
        print("%s and %s have now broken up." % (self.full_name, other.full_name))

class Wendy(Jack):
    def __init__(self, name):
        super().__init__(name)

jack = Jack("Jack")
wendy = Wendy("Wendy")

jack.trip("Overlook Hotel")
jack + wendy
jack - wendy