list = ['a','b','c','d','e']
reverse_list = list[::-1]

string = "python"
print string[::-1]

list = ['a','b','c','d','e']
reverse_list = list[::-2]

  list = ['a','b','c','d','e']
  list[3:] = ['x','y','z']
  print list
  #output : ['a', 'b', 'c', 'x', 'y', 'z']

import os.path
os.path.isfile(filename) # True if file exists
os.path.isfile(dirname) # False if direcoty exists

import os.path
os.path.exists(filename) # True if file exists
os.path.exists(dirname) #True if directory exists

from subprocess import call
call(['ls,'-l'])

print 'True' if True else 'False'