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List Comprehension tuple over iterator in Python


List Comprehension tuple over iterator in Python

By : Alexande
Date : November 20 2020, 03:01 PM
fixed the issue. Will look into that further The result of groupby(s) is not an iterator but tuples of keys and iterators. Passing two variables, "k,c" assigns k's to keys in groupby(s) and c to iterators in groupby(s).
There is ambiguity because
code :
for k,c in groupby(s)
for (k,c) in groupby(s)
for k in groupby(s)


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In Python, whats the difference between a list comprehension with a list and a tuple?

In Python, whats the difference between a list comprehension with a list and a tuple?


By : San Apps
Date : March 29 2020, 07:55 AM
I wish this help you Some people treat tuples as read-only lists, and that works in some contexts. But that is not the semantic intention of tuples. Lists are intended to be used for variable length structures of homogeneous elements (elements with a shared type). Tuples are intended for fixed length structures in which each indexed position contains a certain type of element.
enumerate(lst) is an example of this. It returns a variable-length list of tuples. Each tuple has exactly two elements, the first of which is always an integer, and the second of which is from lst.
code :
tuple(y.x() for y in f)
Sorting tuple genereated by list comprehension in python

Sorting tuple genereated by list comprehension in python


By : user3453317
Date : March 29 2020, 07:55 AM
wish helps you I'm having trouble sorting individual tuple created by a list comprehension. Say we have: , You could just sort the tuples as part of the creation:
code :
words = [sorted((a, b, c)) for a in al for b in bl for c in cl]
words = [tuple(sorted((a, b, c))) for a in al for b in bl for c in cl]
Python list comprehension with dummy names identical to iterator name: ill-advised?

Python list comprehension with dummy names identical to iterator name: ill-advised?


By : Ravi
Date : March 29 2020, 07:55 AM
I wish this helpful for you TL;DR: It is safe, technically, but it's a poor choice stylistically.
In a list comprehension, before binding the free variable of the for-loop to any object, Python will use a GET_ITER opcode on the iterable to get an iterator. This is done just once at the beginning of the loop.
code :
[f(x) for x in xs]
Python 3.x list comprehension VS tuple generator

Python 3.x list comprehension VS tuple generator


By : CT Turró
Date : March 29 2020, 07:55 AM
will help you Basically a list comprehension is faster than a generator expression and as the reason is that its iteration performs in C (Read the @Veedrac's comment for the reason). But the only reason that should use a generator expression within tuple is that you want to perform some operations on your items and/or filter them and more importantly you want a tuple (because of the immutability and its benefits against mutable objects).
After all you can always timeit your code:
code :
In [10]: %timeit tuple(i for i in range(5000))
1000 loops, best of 3: 325 µs per loop

In [11]: %timeit [i for i in range(5000)]
1000 loops, best of 3: 199 µs per loop
In [12]: %timeit list(range(5000))
10000 loops, best of 3: 98.3 µs per loop
Python - List comprehension with tuple unpack

Python - List comprehension with tuple unpack


By : Solomon Adir
Date : March 29 2020, 07:55 AM
wish helps you I have a list of tuples like: tuple_list = [ (0,1,2), (3,4,5), (6,7,8) ] , if you tuple is no so long. you can do:
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