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。这很重要，因为[0x1, 0x1, 0x1] i.e.(0x010101)它将被格式化为"111"而不是"010101"
或
bytearray与配合使用
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 timeitimport binasciinumber = 10000def 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)).depre('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 -> 1.459474583090427Using format-> 1.5809937679100738Using binascii.hexlify -> 0.014521426401399307Testing with 255-byte bytearray:Using str.format -> 1.443447684109402Using format-> 1.5608712609513171Using 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。
