[docs] docs@ InfiniteLoop in example on website

[Abhinav Tyagi]

Following example in Section 4.2 would run into infinite loop.

https://docs.python.org/2/tutorial/controlflow.html#for-statements

>>> for w in words[:]:  # Loop over a slice copy of the entire list....     if len(w) > 6:...         words.insert(0, w)...>>> words['defenestrate', 'cat', 'window', 'defenestrate']


Should be something like this (but still leaves duplicate elements in the
list):
-----------------------------------
words_tmp = copy.deepcopy(words)
for w in words_tmp:
    if len(w)>6 :
            words.insert(0,w)
-----------------------------------


Thanks & Regards
Abhinav Tyagi
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