1 原始文件中的字符串
2 读取文件字符串
从文件中读取2个字节，代码如下：
def print_hex_str(str1):
print len(str1)
print str1
print int(str1, 16)
for i in str1:
print "--------"
print('%#X' % ord(i))
print('%d' % ord(i))
def des_ecb_decrypt_from_file(srcfile, dstfile, key):
fsrc = open(srcfile, 'rb')
if not fsrc:
print "fsrc open failed!"
fdst = open(dstfile, 'wb')
if not fdst:
print "fdst open failed!"
datalen = fsrc.read(2)print type(datalen)
print len(datalen)
print_hex_str(datalen)
3 运行程序报错
4 对字符串进行binascii转换
5 字符串转为整型正常
原字符串为：0X000X58
转换后的字符串为：0058
6 binascii分析
binascii.b2a_hex(data) 字符串转16进制字符串binascii.hexlify(data)¶Return the hexadecimal representation of the binary data. Every byte of data is converted into the corresponding 2-digit hex representation. The resulting string is therefore twice as long as the length of data.
官方网址：https://docs.python.org/2/library/binascii.html
7 参考资料
(1) https://blog.csdn.net/penny_hardaway/article/details/45046643
(2) https://www.cnblogs.com/LarryGen/p/5088144.html