Bài kiểm tra trắc nghiệm về Python - Phần 2

def printHello():
     print("Hello") 
a = printHello()

def outerFunction():
     global a
     a = 20
     def innerFunction():
          global a
          a = 30
          print('a =', a) 
a = 10
outerFunction()
print('a =', a)

class Foo:
     def printLine(self, line='Python'):
     print(line)

o1 = Foo()
o1.printLine('Java')

class Point:
    def __init__(self, x = 0, y = 0):
       self.x = x+1
       self.y = y+1

p1 = Point()
print(p1.x, p1.y)

class Point:

     def __init__(self, x = 0, y = 0):
        self.x = x
        self.y = y

     def __sub__(self, other):
        x = self.x + other.x
        y = self.y + other.y
        return Point(x,y)

p1 = Point(3, 4)
p2 = Point(1, 2)
result = p1-p2
print(result.x, result.y)