Reading data using tn.read_all() in python

Question

read_all()" to read data from a cisco device.
some time it reads the data and sometime it won't read and gives empty string.
I tried below 2 commands but still it's not consitently reading data.

data=tn.read_until("exit")

data= tn.read_all()

please give some inputs i am new to python.

code i am using:

_command2='show chassis'

    print 'Commands issued............'

    #ISSUE COMMANDS VIA TELNET    

    tn.write("term len 0\r")

    #tn.read_until(" ")    

    #tn.write(_command1+"\r")   

    tn.write(_command2+"\r")

    tn.write("exit\r" )

    print 'Read telnet data............'

    #READ TELNET DATA

    #data=tn.read_eager()

    data=tn.read_until("exit")

    #data= tn.read_all()

    #print data

    print 'Telnet data read successfully............'

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Answer 1

I too faced the same problem..This would help:

tn = telnetlib.Telnet('64.0.0.1')
tn.write('ls \r\n')
data = '' 
while data.find('#') == -1:
    data = tn.read_very_eager()
print data

This snippet reads the info after a command being executed. And reads till '#' prompt is shown.

Reading data using tn.read_all() in python

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