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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

    v = list(EXPR)
    v.sort()
    foo(v)

and the more general

    v = EXPR
    v.sort()
    foo(v)

into

    v = sorted(EXPR)
    foo(v)
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        isinstance=comparison< %s %s T=any >
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        |
        sorted=any<
            any*
            simple_stmt<
              expr_stmt< id1=any '='
                         power< list='list' trailer< '(' (not arglist<any+>) any ')' > >
              >
              '\n'
            >
            sort=
            simple_stmt<
              power< id2=any
                     trailer< '.' 'sort' > trailer< '(' ')' >
              >
              '\n'
            >
            next=any*
        >
        |
        sorted=any<
            any*
            simple_stmt< expr_stmt< id1=any '=' expr=any > '\n' >
            sort=
            simple_stmt<
              power< id2=any
                     trailer< '.' 'sort' > trailer< '(' ')' >
              >
              '\n'
            >
            next=any*
        >
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