Author: Agnieszka

Def_functions vol2

Agnieszka 
# *args
def function1(*args):
  return sum(args)
print(function1(1,4,5))

# *args + loop
def function1(*args):
  total = 0
  for i in args:
    total += i
  return total

print(function1(1,2,3))
results
#**kwargs
def function2(**names):
  print("My name is " + names["fname"])
  print("My last name is " + names["lname"])
  print("My full name: " + names["lname"], names["fname"])

function2(fname = "Agnieszka", lname = "Szczep")

#def const value then change it
def function3(music = "Rock"):
  print("I love " + music + " music")

function3()
function3("Hip-hop")
function3("Trance")

#math recursion model
def function4(k):
  if(k > 0):
    result = k + function4(k - 1)
    print(result)
  else:
    result = 0
  return result

print("Recursion Example Results")
function4(4)

Functions structure in Python

Agnieszka

Function is a dedicated block of code, which only runs when it is called.
It is also an essential element of the DRY (Don’t Repeat Yourself) methodology, i.e.
where a functionality will be used many times, we can use the function.
In Python a function is defined using the def keyword:

1 example – def simple ops

def adding(a,b):
    return a+b

print(adding(1,2))
print(adding(2,3))
print(adding(-1,2))
results
def add_numbers(a:int,b:float):
    return a+round(b,2)

print(add_numbers(1,2))  #3
print(add_numbers(3,4.8)) #7.8
print(add_numbers(9,0.33)) #9.33
print(add_numbers(2,math.pi)) #5.1419999999999995


def add_numbers(a:int,b:float):
    return round(a+b,3)
print(add_numbers(2,math.pi)) #5.142

2 example – if statement included

def expon_positiv (x,y):
    if x < 0:
     return '---'
    elif x > 0:
     return x**y

print(expon_positiv(0.1,2))
print(expon_positiv(2,2))
print(expon_positiv(-2,2))
print(expon_positiv(2,-2))
results
def even(a:int):
    if a % 2 == 0:
        return a
    else:
        return a-1

print(even(1))
print(even(2))
print(even(7))
print(even(8))
results

3 example – with global param

acum_base = 0
def accumulate(x):
    global acum_base
    acum_base +=x
    return acum_base

print(accumulate(3))
print(accumulate(2))
print(accumulate(7))
results

4 example – *args, *kwargs

*args collects any number of positional arguments and packs them into a tuple.
**kwargs collects named arguments (keyword arguments) into a dictionary (dict).

def function1(*args):
  return sum(args)
print(function1(1,4,5))

# *args + loop
def function1(*args):
  total = 0
  for i in args:
    total += i
  return total

print(function1(1,2,3))
results
#**kwargs
def function2(**names):
  print("My name is " + names["fname"])
  print("My last name is " + names["lname"])
  print("My full name: " + names["lname"], names["fname"])

function2(fname = "Agnieszka", lname = "Szczep")
result

5 example – def const value then change it

def function3(music = "Rock"):
  print("I love " + music + " music")

function3()
function3("Hip-hop")
function3("Trance")
result

7 example – math recursion model

def function4(k):
  if(k > 0):
    result = k + function4(k - 1)
    print(result)
  else:
    result = 0
  return result

print("Recursion Example Results")
function4(4)

8 example mutability revisited

numbers = [[0,1,2],[3,4,5],[6,7,8]]
def numbers_board(your_number = 0, row = 0, column = 0):
        print("   A  B  C")
        numbers[row][column] = your_number
        for count, row in enumerate(numbers):
                print(count,row)
print(numbers)
numbers_board(your_number=9, row=2, column=1)
print(numbers)

''' ouput1 numbers: 
[[0, 1, 2], [3, 4, 5], [6, 7, 8]]
output2 numbers_board:
   A  B  C
0 [0, 1, 2]
1 [3, 4, 5]
2 [6, 9, 8]
output3 numbers:
[[0, 1, 2], [3, 4, 5], [6, 9, 8]]'''

value = "set a number"
print(id(value)) #output: 1909035942960
def numbers():
        global value
        value = "0-9"
        print(id(value)) #output: 1909035390448
        print(value) #output: 0-9

numbers() 
print(value) #output: 0-9
print(id(value)) #output: 1909035390448

def numbers_board(numbers, your_number = 0, row = 0, column = 0, just_show = False):
        print("   A  B  C")
        if not just_show:
                numbers[row][column] = your_number
        for count, row in enumerate(numbers):
                print(count,row)
        return numbers

numbers_board(numbers, your_number=9, row=2, column=1)