How can I find the index for a given item in a list?
@stefanct this likely does double the complexity, I believe the in operator on a list has linear runtime. . @ApproachingDarknessFish stated it would iterate twice which answers your …
How do I make a flat list out of a list of lists? - Stack Overflow
Dec 3, 2016 · A list of lists named xss can be flattened using a nested list comprehension: flat_list = [ x for xs in xss for x in xs ] The above is equivalent to: flat_list = [] for xs in xss: for x in xs: …
Command to list all files in a folder as well as sub-folders in windows
Mar 11, 2015 · To print specific file present in the folders/sub-folders for eg : If you want to list just the csv files then : dir /b/s/A-D/o:gn *.csv >list.txt If you want to also include .xlsx files then the …
What is the syntax to insert one list into another list in python?
Sep 20, 2010 · List slicing is quite flexible as it allows to replace a range of entries in a list with a range of ...
python - Removing duplicates in lists - Stack Overflow
Nov 1, 2011 · def make_unique(original_list): unique_list = [] [unique_list.append(obj) for obj in original_list if obj not in unique_list] return unique_list Some may consider list comprehension …
Best way to remove elements from a list - Stack Overflow
Feb 2, 2014 · This makes indexing a list a[i] an operation whose cost is independent of the size of the list or the value of the index. When items are appended or inserted, the array of references …
TypeError: list indices must be integers or slices, not str
Sep 14, 2015 · 1. A list is used as if it were a dictionary 1.1. Index a list as if it was a dictionary. This case commonly occurs when a json object is converted into a Python object but there's a …
Array versus List<T>: When to use which? - Stack Overflow
Jan 12, 2009 · Using e.g. List<Point> list, it would be necessary to instead say Point temp=list[3]; temp.x+=q; list[3]=temp;. It would be helpful if List<T> had a method Update<TP>(int index, …
writing a list to a txt file in python - Stack Overflow
Dec 2, 2013 · writelines() needs a list of strings with line separators appended to them but your code is only giving it a list of integers. To make it work you'd need to use something like this: …
python - Find a value in a list - Stack Overflow
Another alternative: you can check if an item is in a list with if item in list:, but this is order O(n). If you are dealing with big lists of items and all you need to know is whether something is a …