#!/usr/bin/python2.7
from subprocess import call
ip = ("8.8.8.8")
def pingWH(ip):
    call('ping -c 1 %s'%ip, shell=True)
pingWH(ip)

#!/usr/bin/python2.7
from subprocess import call
from Tkinter import *
a=Tk()
ip = ("8.8.8.8")
def pingWH(ip):
    call('ping -c 1 '+ip, shell=True)
b=Button(text='text')
b.pack()
b.bind("<1>",pingWH)
a.mainloop()

  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1437, in __call__
    return self.func(*args)
  File "./1.py", line 7, in pingWH
    call('ping -c 1 '+ip, shell=True)
TypeError: cannot concatenate 'str' and 'instance' objects

b.bind("<1>", lambda event: pingWH(ip))

b.bind("<1>", lambda event: pingWH(ip, event))

def pingWH(ip, event):