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https://stackoverflow.com/questions/10973766/understanding-the-map-function
Understanding the map function
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506edited Jun 3, 2015 at 13:16
map isn't particularly pythonic. I would recommend using list comprehensions instead:

map(f, iterable)
is basically equivalent to:

[f(x) for x in iterable]
map on its own can't do a Cartesian product, because the length of its output list is always the same as its input list. You can trivially do a Cartesian product with a list comprehension though:

[(a, b) for a in iterable_a for b in iterable_b]
The syntax is a little confusing -- that's basically equivalent to:

result = []
for a in iterable_a:
for b in iterable_b:
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https://stackoverflow.com/questions/10973766
python - Understanding the map function - Stack Overflow
WebJun 11, 2012 · ys.append(x * 2) n-ary map is equivalent to zipping input iterables together and then applying the transformation function on every element of that intermediate zipped list. It's not a Cartesian product: xs = [1, 2, 3] ys = [2, 4, 6] def f(x, y): return (x * 2, y // 2) …
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map isn't particularly pythonic. I would recommend using list comprehensions instead: map(f, iterable) is basically equivalent to: [f(x) for x in...
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map doesn't relate to a Cartesian product at all, although I imagine someone well versed in functional programming could come up with some impossi...
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map creates a new list by applying a function to every element of the source: xs = [1, 2, 3] # all of those are equivalent — the output is [2, 4,...
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Simplifying a bit, you can imagine map() doing something like this: def mymap(func, lst): result = [] for e in lst: result.append...
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The map() function is there to apply the same procedure to every item in an iterable data structure, like lists, generators, strings, and other s...
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Webmap(do, range(1000)) def _list(): [do(i) for i in range(1000)] timeit(_for, number=10000) # 2.5515936921388516. timeit(_map, number=10000) # 0.010167432629884843. …
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Is map a function in Python?You will notice that Python has some other functional programming functions such as reduce, filter, zip etc. map is part of this class of functions where although each implements a very simple function, when you combine these into a single statement you can get very powerful results.
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What is the difference between Python 2 map and Python 3 map?In Python 2 map (), will iterate (go through the elements of the lists) according to the longest list, and pass None to the function for the shorter lists, so your function should look for None and handle them, otherwise you will get errors. In Python 3 map () will stop after finishing with the shortest list.
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Can I use a map in Python?Yes, but that's not too much easier than simply using the above method. At the end of the day, you can use for loops, list comprehensions, or map s for many of the same uses. It's up to you whatever you are comfortable with, is easy to read/understand, and is Pythonic!
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What does Python's locals() do?What does Python's locals () do? Python's locals() documentation says: Update and return a dictionary representing the current local symbol table. Free variables are returned by locals() when it is called in function blocks, but not in class blocks.
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WebNov 25, 2016 · Python's locals() documentation says: Update and return a dictionary representing the current local symbol table. Free variables are returned by locals() …
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WebWell, with that we can implement something like def f(x, *args, y=10) in python2 as that raises a syntax error in python2 but just works in python3: def f(x, *args, **kwargs): y = …
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WebAug 29, 2020 · return a + b. x = map(myfunc, ('apple', 'banana', 'cherry'), ('orange', 'lemon', 'pineapple')) print(x) print(list(x)) #for readability. in your case you can do this. def …
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Webmap(str.lower, list_of_strings) where str.lower is the unbound method on the str type. Note that a list comprehension is not really the equivalent of a map() here. map() can only do …
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WebMar 14, 2015 · As the question states. map(f, iterable) can be written as [f(x) for x in iterable]. Which is better to use? And why? As an example, I would like to convert a list …
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WebAug 24, 2014 · Python - use list as function parameters [duplicate] (4 answers) Closed 9 years ago. I know function map. It is used something like. new_list = map(func, list) But …
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WebJul 10, 2018 · old_list[i] = Sanitize(old_list[i]) There's nothing built-in. As suggested in the comments: a function as desired by the OP: def map_in_place(fn, l): for i in range(len(l)): …
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