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Adjust some old Python 2 idioms to their modern counterparts.

* Change some type comparisons to isinstance() calls:
    type(x) == T -> isinstance(x, T)
    type(x) is T -> isinstance(x, T)
    type(x) != T -> not isinstance(x, T)
    type(x) is not T -> not isinstance(x, T)

* Change "while 1:" into "while True:".

* Change both

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    v.sort()
    foo(v)

and the more general

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    v.sort()
    foo(v)

into

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    foo(v)
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              >
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            next=any*
        >
        |
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        >
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