The pass keyword in a Python function

There are cases when you need to write a function template, but there is no code for it yet. If you leave the function body empty, Python will immediately return an error:

pythondef func(test): # will display an error

In this case, the pass keyword should be used. It fills the empty space in the function body, and no error will be returned:

pythondef func(test):
  pass

pythonnum1 = 2
num2 = 3
def func(num1, num2):

res = func(num1, num2)
print(res)

pythontst1 = 'abc'
tst2 = 'def'

def func1(txt):
  return txt.upper()
  
def func2(txt1, txt2):

res = func2(func1(tst1), tst2)
print(res)