执行Python代码时发生IndentationError

请通读上述代码，并确定在test=“ping”行中出现的错误，该行将获得一个

indicationerror

from os import popen
from string import split, join
from re import match
import subprocess
import os
   # execute the code and pipe the result to a string
rtr_table = [elem.strip().split() for elem in popen("route print").read().split("Metric\n")[1].split("\n") if match("^[0-9]", elem.strip())]
#print "Active default gateway:", rtr_table[0][2]
x=rtr_table[0][2]
#x has a.a.a.a 
y = x[:x.rfind(".")]
# y has a.a.a
# in order to test in range of 1 to 255 for the default gateway
for i in range(1,255):
#ping by sending 1 packet and wait for 500 milli seconds 
test = "ping -n 1 -w 500 %s.%d" % (y,i)
process = subprocess.Popen(test, shell=True, stdout=subprocess.PIPE)
   # give it time to respond
process.wait()
   # optional check (0 --> success)
   #print process.returncode
   # read the result to a string
result_str = process.stdout.read()
   # test it ...
   # print result_str
#from arp we get mac address and corresponding ip address and state as we use '-a'
lines=os.popen('arp -a')
for line in lines:
   print line
sh-4.3$ python main.py                                                                                                                                                          
  File "main.py", line 20                                                                                                                                                       
    test = "ping -n 1 -w 500 %s.%d" % (y,i)                                                                                                                                     
       ^                                                                                                                                                                        
IndentationError: expected an indented block                                                                                                

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您忘记了在下面的第一个for循环缩进

您应该在

for

语句之后缩进。看起来非常明显RTR_table=[elem.strip（）.split（）（用于popen（“路由打印”）.read（）.split（“度量\n”）[1]。split（“\n”）如果匹配（^[0-9]”，elem.strip（））]indexer:列表索引超出范围我收到此错误

from os import popen
from string import split, join
from re import match
import subprocess
import os
   # execute the code and pipe the result to a string
rtr_table = [elem.strip().split() for elem in popen("route print").read().split("Metric\n")[1].split("\n") if match("^[0-9]", elem.strip())]
#print "Active default gateway:", rtr_table[0][2]
x=rtr_table[0][2]
#x has a.a.a.a 
y = x[:x.rfind(".")]
# y has a.a.a
# in order to test in range of 1 to 255 for the default gateway
for i in range(1,255):
    #ping by sending 1 packet and wait for 500 milli seconds 
    test = "ping -n 1 -w 500 %s.%d" % (y,i)
    process = subprocess.Popen(test, shell=True, stdout=subprocess.PIPE)
    # give it time to respond
    process.wait()
    # optional check (0 --> success)
    #print process.returncode
    # read the result to a string
    result_str = process.stdout.read()
    # test it ...
    # print result_str
    #from arp we get mac address and corresponding ip address and state as we use '-a'
lines=os.popen('arp -a')
for line in lines:
   print line