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Python 2.7 and 3.0 unified all collection types by introducing dictionary and set comprehensions, similar to list comprehensions: >>> [ n * n for n in range ( 5 )] # regular list comprehension [ 0 , 1 , 4 , 9 , 16 ] >>> >>> { n * n for n in range ( 5 )} # set comprehension { 0 , 1 , 4 , 9 , 16 } >>> >>> { n : n * n for n in range ( 5 )} # dict ...
Python 2.7 and 3.x also support dict comprehensions (similar to list comprehensions), a compact syntax for generating a dictionary from any iterator: >>> square_dict = { i : i * i for i in range ( 5 )} >>> square_dict { 0 : 0 ,
Here, the list [0..] represents , x^2>3 represents the predicate, and 2*x represents the output expression.. List comprehensions give results in a defined order (unlike the members of sets); and list comprehensions may generate the members of a list in order, rather than produce the entirety of the list thus allowing, for example, the previous Haskell definition of the members of an infinite list.
A generator expression may be used in Python versions >= 2.4 which gives lazy evaluation over its input, and can be used with generators to iterate over 'infinite' input such as the count generator function which returns successive integers:
[52] [53] While Python 2.7 and older versions are officially unsupported, a different unofficial Python implementation, PyPy, continues to support Python 2, i.e. "2.7.18+" (plus 3.10), with the plus meaning (at least some) "backported security updates". [54] Python 3.0 was released on 3 December 2008, with some new semantics and changed syntax.
The US Justice Department has entered an agreement with the Antioch, California, police department, which will end an investigation into racist text messages sent and received by its officers.
“The message was that he wants what everyone else wants: his agenda to pass,” Self said. “And that was my message to him: ‘Mr. President, we need a strong negotiating team.’” ...
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...