CODEWITHSUNDEEP
python
krock1516
krock1516

Reputation: 461

Python TypeError: execv() arg 2 must contain only strings

I have a below code written to get the Speed of the current running interface on the Linux but when i'm running this script its just throwing the error : TypeError: execv() arg 2 must contain only strings .

would appreciate any help or ideas.

Below is the script:

In the Below script i have 2 functions created 1) The one is get_Inf() which gives the Interface information. 2) The Second One is get_intSpeed() which takes the interface name from the First functon and pass it the os command ethtool which further parsed in via a regex to Fetch only the Speed like 1000Mb/s.

#!/grid/common/pkgs/python/v2.7.10/bin/python
import subprocess
import netifaces
import re

''' This snippet is just to get the Speed of the running interface on the System '''



def get_Inf():
    Current_inf = netifaces.gateways()['default'][netifaces.AF_INET][1]
    return get_Inf

def get_intSpeed():
    spd = subprocess.Popen(['/sbin/ethtool', get_Inf()], stdout=subprocess.PIPE).communicate()[0]
    pat_match=re.search(".*Speed:\s+(\d+Mb/s)\s+.*", spd)       # "d" means any number of digit following the "Mb/s".
    speed = pat_match.group(1)
    return speed

def main():
    print get_intSpeed()


main()

Below is the os command /sbin/ethtool which has the Speed information of the Interface along with Other Information.

[root@tss /]# /sbin/ethtool eth0| grep Speed
              Speed: 1000Mb/s
[root@tss /]# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: g
        Link detected: yes

I am using python version 2.7.10.

Upvotes: 1

Views: 1367

Answers (1)

Albert P
Albert P

Reputation: 375

Your get_Inf() function will return itself with the return get_Inf statement, which is not a string, that is why execv (which is called by subprocess.Popen) is complaining. You should return Current_Inf from your function.

Upvotes: 2

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