Python evaluation of default arguments

defaultarguments.py

def func1(f1=None):
    print("In func1a")
    return f1

def func2(f2=func1):
    print("In func2a")
    return f2()

def func1(f1=func2):
    print("In func1b")
    return f1()

def func2(f2=func1):
    print("In func2b")
    return f2()


func1()



def func3():
    print("In func3a")
    return None

def func4():
    print("In func4a")
    return func3()

def func3():
    print("In func4b")
    return func4()

# func3() # Yes, it is still possible to call the functions recursively