笔记
a = 10
b = 20
print(dir(a)) # Python中一切皆对象
print(a + b) # 执行加法运算
print(a.__add__(b))
print(a.__sub__(b)) # 执行减法运算
print(f'{a}<{b}吗?', a.__lt__(b))
print(f'{a}<={b}吗?', a.__le__(b))
print(f'{a}=={b}吗?', a.__eq__(b))
print('-' * 30)
print(f'{a}>{b}吗?', a.__gt__(b))
print(f'{a}>={b}吗?', a.__ge__(b))
print(f'{a}!={b}吗?', a.__ne__(b))
print('-'*40)
print(a.__mul__(b))
print(a.__truediv__(b))
print(a.__mod__(b))
print(a.__floordiv__(b))
print(a.__pow__(2))