def my_function():
  print("Hello from a function")

my_function()

Hello from a function

def my_function(fname):
  print(fname + " Refsnes")

my_function("Emil")
my_function("Tobias")
my_function("Linus")

Emil Refsnes
Tobias Refsnes
Linus Refsnes 

def my_function(country = "Iran"):
  print("I am from " + country)

my_function("Sweden")
my_function("India")
my_function()
my_function("Brazil")

I am from Sweden
I am from India
I am from Iran
I am from Brazil

def my_function(x):
  return 5 * x

print(my_function(3))
print(my_function(5))
print(my_function(9))

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۲۵
۴۵

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

print("\n\nRecursion Example Results")
tri_recursion(6)

Recursion Example Results
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۳
۶
۱۰
۱۵
۲۱