x = "the exam is looming on Thursday".split()
print x
['the', 'exam', 'is', 'looming', 'on', 'Thursday']




for (index,word) in enumerate(x):
    if "i" in word:
        print "first i ", index
        
first i  2

first i  3


for index in range(len(x)):
    if "i" in x[index]:
        print "first i", index
        
first i 2

first i 3


y = [ [3, 4, 5, 6], [3, 5], [6,7]]
print set(y)
Traceback (most recent call last):
  File "C:\Users\Susan\AppData\Local\Enthought\Canopy\App\appdata\canopy-2.1.3.3542.win-x86_64\lib\site-packages\IPython\core\interactiveshell.py", line 2885, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-8-1ce6091a08cb>", line 1, in <module>
    print set(y)
TypeError: unhashable type: 'list'

y = set(4,5,6,7)
Traceback (most recent call last):
  File "C:\Users\Susan\AppData\Local\Enthought\Canopy\App\appdata\canopy-2.1.3.3542.win-x86_64\lib\site-packages\IPython\core\interactiveshell.py", line 2885, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-9-e937cbaa28ae>", line 1, in <module>
    y = set(4,5,6,7)
TypeError: set expected at most 1 arguments, got 4

y = set([4,5,6,7,4,5])
print y
set([4, 5, 6, 7])