字节数组到十六进制字符串

使用str.format：

        array_alpha = [ 133, 53, 234, 241 ] print ''.join('{:02x}'.format(x) for x in array_alpha) 8535eaf1 或使用 format

        print ''.join(format(x, '02x') for x in array_alpha) 8535eaf1 注意：在format语句中，02表示0在必要时最多填充2个前导s。这是重要的，因为[0x1, 0x1, 0x1] i.e. (0x010101)会被格式化"111"，而不是"010101"

或bytearray用于binascii.hexlify：

        import binascii binascii.hexlify(bytearray(array_alpha)) '8535eaf1' 这是Python 3.6.1中上述方法的基准：

from timeit import timeit import binascii

number = 10000

def using_str_format() -> str: return "".join("{:02x}".format(x) for x in test_obj)

def using_format() -> str: return "".join(format(x, "02x") for x in test_obj)

def using_hexlify() -> str: return binascii.hexlify(bytearray(test_obj)).decode('ascii')

def do_test(): print("Testing with {}-byte {}:".format(len(test_obj), test_obj.class.name)) if using_str_format() != using_format() != using_hexlify(): raise RuntimeError("Results are not the same")

print("Using str.format -> " + str(timeit(using_str_format, number=number))) print("Using format -> " + str(timeit(using_format, number=number))) print("Using binascii.hexlify -> " + str(timeit(using_hexlify, number=number)))

test_obj = bytes([i for i in range(255)]) do_test()

test_obj = bytearray([i for i in range(255)]) do_test() 结果：

Testing with 255-byte bytes: Using str.format -> 1.459474583090427 Using format -> 1.5809937679100738 Using binascii.hexlify -> 0.014521426401399307 Testing with 255-byte bytearray: Using str.format -> 1.443447684109402 Using format -> 1.5608712609513171 Using binascii.hexlify -> 0.014114164661833684 使用的方法format的确提供了其他格式选项，例如用空格" ".join，逗号", ".join，大写字母"{:02X}".format(x)/ format(x, "02X")等分隔数字，但是会影响性能。