未知格式代碼「X」

我工作的一個程序在Python和所有的代碼看起來當我運行該程序從終端我收到以下錯誤消息，除了良好：未知格式代碼「X」

Traceback (most recent call last): 
    File "packetSniffer.py", line 25, in <module> 
    main() 
    File "packetSniffer.py", line 10, in main 
    reciever_mac, sender_mac, ethernetProtocol, data = ethernet_frame(rawData) 
    File "packetSniffer.py", line 17, in ethernet_frame 
    return getMacAddress(reciever_mac), getMacAddress(sender_mac), socket.htons(protocol), data[14:] 
    File "packetSniffer.py", line 21, in getMacAddress 
    bytesString = map('{:02x}'.format, bytesAddress) 
ValueError: Unknown format code 'x' for object of type 'str'

這裏是到目前爲止我的整個程序的代碼，任何人都可以提供幫助嗎？

import struct 
import textwrap 
import socket 

def main(): 
    connection = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(3)) 

    while True: 
     rawData, address = connection.recvfrom(65535) 
     reciever_mac, sender_mac, ethernetProtocol, data = ethernet_frame(rawData) 
     print('\nEthernet Frame: ') 
     print('Destination: {}, Source: {}, Protocol: {}'.format(reciever_mac, sender_mac, ethernetProtocol)) 

# Unpack ethernet frame 
def ethernet_frame(data): 
    reciever_mac, sender_mac, protocol = struct.unpack('! 6s 6s H', data[:14]) 
    return getMacAddress(reciever_mac), getMacAddress(sender_mac), socket.htons(protocol), data[14:] 

# Convert the Mac address from the jumbled up form from above into human readable format 
def getMacAddress(bytesAddress): 
    bytesString = map('{:02x}'.format, bytesAddress) 
    macAddress = ':'.join(bytesString).upper() 
    return macAddress 

main()

來源

2016-07-19 Ahad Sheriff

你確定這是Python 3嗎？ – Will

似乎是從這裏：https://github.com/koehlma/snippets/blob/master/python/network/sniffer.py https://stackoverflow.com/questions/34968090/python-3-4-未知格式碼-X – Will

在下面的代碼段，format typex不指望字符串。它接受整數。然後它將整數轉換爲相應的十六進制格式。

# Convert the Mac address from the jumbled up form from above into human readable format 
def getMacAddress(bytesAddress): 
    bytesString = map('{:02x}'.format, bytesAddress) 
    macAddress = ':'.join(bytesString).upper()

因此，如果您bytestAddress是整數的字符串形式，那麼，你可以這樣做：

bytesAddress = '123234234' 
map('{:02x}'.format, [int(i) for i in bytesAddress]) 
#map('{:02x}'.format, map(int, bytesAddress)) 
['01', '02', '03', '02', '03', '04', '02', '03', '04']

此外，如果你要處理一對整數（以字符串形式）爲十六進制，那麼首先將`bytesAddress'轉換爲

[bytesAddress[i:i+2] for i in range(0, len(bytesAddress), 2)]

來源

2016-07-19 07:19:24 DurgaDatta

未知格式代碼「X」

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