在kali linux 中使用scapy后，使用sniff命令后报上面的错误

I see. The error message "NameError: name 'Sniff' is not defined" is likely caused by a typo in your code. In Scapy, the command to capture and sniff packets is lowercase "sniff", not "Sniff" with an uppercase S.

Here's an example of how to use the "sniff" function in Scapy:

from scapy.all import *

# Define a function to handle captured packets
def handle_packet(packet):
    # Do something with the packet (e.g. print its contents)
    print(packet.summary())

# Capture packets using sniff function
sniff(filter="icmp", prn=handle_packet)

In this example, the "sniff" function is used to capture ICMP packets and pass them to the "handle_packet" function for processing. The "filter" parameter specifies a BPF filter expression to select which packets to capture, and the "prn" parameter specifies the callback function to handle each captured packet.

Make sure to double-check your code and ensure that you are using the correct syntax for the "sniff" function.