PySNMP walk - 省略maxRows参数？

Question

我正在尝试使用基于PySNMP开发人员提供的示例的脚本进行SNMP漫游。

我的代码看起来像这样

from pysnmp.entity.rfc3413.oneliner import cmdgen
from os.path import exists
import sys
import os

# Turn on debugging
#debug.setLogger(debug.Debug('msgproc', 'secmod'))

# Enter parameters
target_IP           = raw_input('Target IP (192.168.13.100): ') or '192.168.13.100'
target_port         = raw_input('Target port (161): ') or 161
target_file_name    = raw_input('Target filename (.txt is added): ') + '.txt' 

# Check for already existing file
path = 'walks/'
if not os.path.exists(path):
    os.makedirs(path)
if exists(path+target_file_name):
    sys.exit("The file '%s' already exists. Try again." % target_file_name)
else: 
    target_file = open(path+target_file_name, 'w+')

# Initialize counter to zero
counter = 0

# Create command generator
cmdGen = cmdgen.CommandGenerator()

# Get data

errorIndication, errorStatus, errorIndex, varBindTable = cmdGen.nextCmd(
    cmdgen.CommunityData('public'),
    cmdgen.UdpTransportTarget((target_IP, target_port)),
    '1.3',  # <----------------- doesn't seem perfect either
    lexicographicMode=True, 
    maxRows=5000, # <-------------------- can't leave it out
    ignoreNonIncreasingOid=True,
    lookupNames=True, 
    lookupValues=True
)

# Print errors and values to file
if errorIndication:
    print(errorIndication)
else:
    # Print error messages

    if errorStatus:
        print('%s at %s' % (
            errorStatus.prettyPrint(),
            errorIndex and varBindTable[-1][int(errorIndex)-1] or '?'
            )
        )
    else:
        # Print values
        for varBindTableRow in varBindTable:
            for name, val in varBindTableRow:
                counter += 1
                target_file.write("(%s)\t start_OID: %s\tvalue =\t%s\n" % (counter, name.prettyPrint(), val.prettyPrint()))

        # Finish the operation                
        target_file.close()
        print('Writing to %s successful. %d lines have been written' % (target_file_name, counter))
        sys.exit(0)

现在效果很好，唯一的问题是我不能忽略maxRows参数。但是，如果我总是要输入最大行数，我如何让它“走到尽头”？