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...Algorithm Transition Plan If the algorithm used to hash target and metadata files becomes vulnerable, it SHOULD be replaced by a stronger hash algorithm. The TUF metadata format allows to list digests from different hash algorithms alongside each other, together with an algorithm identifier, so that clients can seamlessly switch between algorithms. However, once support for an old algorithm is turned off, clients that don't support the new algorithm will only be able to install or update package...
...Algorithm Transition Plan If the algorithm used to hash target and metadata files becomes vulnerable, it SHOULD be replaced by a stronger hash algorithm. The TUF metadata format allows to list digests from different hash algorithms alongside each other, together with an algorithm identifier, so that clients can seamlessly switch between algorithms. However, once support for an old algorithm is turned off, clients that don't support the new algorithm will only be able to install or update ...
...algorithms that worked fine for small inputs but took O(n**2) time for large inputs due to the underlying O(n) behavior of array-based lists. The deque type, introduced in Python 2.4, solved the most common problem of needing a fast FIFO queue. However, the deque type doesn't help if we need to repeatedly insert or delete elements from the middle of a long list. A wide variety of data structure provide good asymptotic performance for insertions and deletions, but they either have O(n) performan...
...algorithm was switched from right-to-left to left-to-right, which is more efficient for small bases. In addition, if the exponent is large, the algorithm now does 5 bits (instead of 1 bit) at a time. That cut the time to compute 17**1000000 on my box in half again, down to about 4.5 seconds. OverflowWarning is no longer generated. PEP 237 scheduled this to occur in Python 2.3, but since OverflowWarning was disabled by default, nobody realized it was still being generated. On the chance that ...
...sequential and keyword arguments to the call, passed unchanged from tp_call. (The 'type' argument is used in combination with inheritance, see below.) There are no constraints on the object type that is returned, although by convention it should be an instance of the given type. It is not necessary that a new object is returned; a reference to an existing object is fine too. The return value should always be a new reference, owned by the caller. Once the tp_new slot has returned an object, fu...
...algorithm is now used. This is most effective if the inputs have roughly the same size. If they both have about N digits, Karatsuba multiplication has O(N**1.58) runtime (the exponent is log_base_2(3)) instead of the previous O(N**2). Measured results may be better or worse than that, depending on platform quirks. Besides the O() improvement in raw instruction count, the Karatsuba algorithm appears to have much better cache behavior on extremely large integers (starting in the ballpark of a ...
...sequential order so that each case clause constitutes an actual statement. At the same time, we allow the interpreter to cache any information about the subject or change the order in which subpatterns are tried. In other words: if the interpreter has found that the subject is not an instance of a class C, it can directly skip case clauses testing for this again, without having to perform repeated instance-checks. If a guard stipulates that a variable x must be positive, say (i.e. if x > 0...