How to determine parity using python

How to use Python to determine parity: Modulo operation: If the remainder of a number divided by 2 is 0, it is an even number. Binary bit mask: The lowest bit of even numbers is 0 in binary representation, and the lowest bit of odd numbers is 1. Logical operations: Even numbers can be represented as multiples of 2, odd numbers cannot.

How to use Python to determine parity

It is very simple to determine whether a number is odd or even in Python.

1. Modulo operation

The most common method is to use the modulus operator (%). A number is even if the remainder when divided by 2 is 0; otherwise, it is odd.

<code class="python">def is_even(number):
    """
    判断一个数字是否为偶数。

    参数：
        number：要判断的数字

    返回：
        True 如果数字为偶数，否则为 False
    """
    return number % 2 == 0</code>

2. Binary bit mask

Another method is to use binary bit mask. The lowest bit of the binary representation of even numbers is always 0, and the lowest bit of odd numbers is always 1. Therefore, we can use the bitwise AND operator (&) to operate a number with 1. If the result is 0, the number is even; otherwise, it is odd.

<code class="python">def is_even_bitmask(number):
    """
    使用位掩码判断一个数字是否为偶数。

    参数：
        number：要判断的数字

    返回：
        True 如果数字为偶数，否则为 False
    """
    return (number & 1) == 0</code>

3. Logical operations

Finally, we can also use logical operations to determine parity. Even numbers can be expressed as multiples of 2, but odd numbers cannot. Therefore, we can use the logical XOR operator (^) to operate a number with 1. If the result is 0, the number is even; otherwise, it is odd.

<code class="python">def is_even_logical(number):
    """
    使用逻辑运算判断一个数字是否为偶数。

    参数：
        number：要判断的数字

    返回：
        True 如果数字为偶数，否则为 False
    """
    return (number ^ 1) == 0</code>

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