python - if else in a list comprehension - Stack Overflow Note that in the first list comprehension for X_non_str, the order is: expression for item in iterable if condition and in the last list comprehension for X_str_changed, the order is: expression1 if condition else expression2 for item in iterable I always find it hard to remember that expression1 has to be before if and expression2 has to be
Create a dictionary with list comprehension in Python A dictionary comprehension takes the form {key: value for (key, value) in iterable} This syntax was introduced in Python 3 and backported as far as Python 2 7, so you should be able to use it regardless of which version of Python you have installed
python - What does list comprehension and similar mean? How does it . . . A list comprehension is a high level, declarative way to create a list in Python The main benefits of comprehensions are readability and maintainability A lot of people find them very readable, and even developers who have never seen them before can usually guess correctly what it means
python - How can I use list comprehensions to process a nested list . . . For small number of lists with less elements per list, the difference is negligible For larger lists with more elements per list one might like to use map instead of list comprehension, but it totally depends on application needs However I personally find list comprehension to be more readable and idiomatic than map
How to parallelize list-comprehension calculations in Python? No, because list comprehension itself is a sort of a C-optimized macro If you pull it out and parallelize it, then it's not a list comprehension, it's just a good old fashioned MapReduce But you can easily parallelize your example Here's a good tutorial on using MapReduce with Python's parallelization library:
Understanding list comprehensions in Python - Stack Overflow It was intentionally done like that for reasons of efficiency But so many complained about it that it was changed for Python 3 Which means that Python 3 list comps don't "leak", but they are also a little slower than Python 2 list comps, and consume a little more RAM –
Python Asynchronous Comprehensions - how do they work? @Dave: no, unbounded asynchronous generators do not break, they work just like regular generators except that they also yield to the event loop Yes, a list comprehension using async for will produce a list object just like a regular list comprehension, with the only difference being the yielding-to-the-eventloop behaviour of coroutines
python - List comprehension with if statement - Stack Overflow Don't confuse a list comprehension (filtering), with a conditional expression (which must have a value, making the else expression mandatory) – Martijn Pieters Commented Jun 20, 2017 at 6:00