set-comprehension | 易学教程

How do python Set Comprehensions work?

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问题 Q1 - Is the following a set() of a generator expression or a set comprehension ? (Or are they same? If so, are list & dict comprehensions also corresponding type-cast on generators?) my_set = {x for x in range(10)} Q2 - Does the evaluation consider duplicate values & then remove them by applying set() ? dup_set = {x for x in [0, 1, 2, 0, 1, 2]} Does the comprehension perform (speed-wise) better than regular for loops? Update - I tried using timeit for speed comparisons. Am not sure if I am

Dictionary/set comprehensions inside of f-string

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来源： https://stackoverflow.com/questions/49120113/dictionary-set-comprehensions-inside-of-f-string

Dictionary/set comprehensions inside of f-string

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来源： https://stackoverflow.com/questions/49120113/dictionary-set-comprehensions-inside-of-f-string

Dictionary/set comprehensions inside of f-string

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来源： https://stackoverflow.com/questions/63038526/inline-dictionary-as-argument-in-f-string

Python Set Comprehension

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问题 So I have these two problems for a homework assignment and I'm stuck on the second one. Use a Python Set Comprehension (Python's equivalent of Set Builder notation) to generate a set of all of the prime numbers that are less than 100. Recall that a prime number is an integer that is greater than 1 and not divisible by any integer other than itself and 1. Store your set of primes in a variable (you will need it for additional parts). Output your set of primes (e.g., with the print function).

Why is there no tuple comprehension in Python?

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As we all know, there's list comprehension, like [i for i in [1, 2, 3, 4]] and there is dictionary comprehension, like {i:j for i, j in {1: 'a', 2: 'b'}.items()} but (i for i in (1, 2, 3)) will end up in a generator, not a tuple comprehension. Why is that? My guess is that a tuple is immutable, but this does not seem to be the answer. Martijn Pieters You can use a generator expression: tuple(i for i in (1, 2, 3)) but parentheses were already taken for … generator expressions. chepner Raymond Hettinger (one of the Python core developers) had this to say about tuples in a recent tweet : #python

Why is there no tuple comprehension in Python?

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问题 As we all know, there\'s list comprehension, like [i for i in [1, 2, 3, 4]] and there is dictionary comprehension, like {i:j for i, j in {1: \'a\', 2: \'b\'}.items()} but (i for i in (1, 2, 3)) will end up in a generator, not a tuple comprehension. Why is that? My guess is that a tuple is immutable, but this does not seem to be the answer. 回答1: You can use a generator expression: tuple(i for i in (1, 2, 3)) but parentheses were already taken for … generator expressions. 回答2: Raymond Hettinger