Optional Function Parameters in Python

Function parameters can be made optional. To do this, parameters need to be given default values. Let's see how this is done. Let's assume we have the following function:

pythondef func(num1, num2):
  return num1 + num2

print(func(1, 2)) # 3

Let's make the second parameter default to 2:

pythondef func(num1, num2=2):
  return num1 + num2

Let's check how our function works with only the first parameter:

pythonprint(func(1)) # 3

Even though the second number is an optional parameter, you can still set a value for it when calling the function:

pythonprint(func(2, 4)) # 6

pythondef func(num=5):
  return num * 2

pythonprint(func(2))
print(func(10))
print(func())

pythondef func(num1=1, num2=3):
  return num2 - num1

pythonprint(func(6, 10))
print(func(5))
print(func())