Lesson04

def a():
    y = 2
    return y + ｙ
    
x = a()
print(x)

x = a() + a()
print(x)

def b():
    y = 2
    return True
    
x = b()
print(x)
print(b()+b())
#print(b + b)

def a():
    y = 1 
    def b():
        print("I am from function b")
        #return None <-- hide
    return b
    
x = a()
print(x())
#print(None) x() = b(), after running b(), return None

def a():
    y = 1 
    def b():
        print("I am from function b")
        #return None <-- hide
    return b()
x = a()
print(x)

def a():
    y = [1,2,3]
    z = 1,2,3
    def b():
        print("I am from function b")
        return None
    return y,z,b
x = a()
print(x[2](), id(x))    #x[2]() == b() function

def a(w):
    y = w
    z = 1,2,3
    def b():
        print("I am from function b")
        return None
    return y,z,b
x = a([1,2,3])
print(x[0], id(x))

def a(w):
    y = w
    z = 1,2,3
    def b():
        print("I am from function b")
        return None
    return y,z,b
x = a(True)
print(x[0], id(x))

def a(w):
    y = w
    z = 1,2,3
    def b():
        print("I am from function b")
        return None
    return y + y
x = a('k')
print(x, id(x))

def a(w):
    return w()
def b():
    print("I am fron function b")
a(b)