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You may want to use one of two possible searches while working with list of strings: if list element is equal to an item ('example' is in ['one','example','two']): if item in your_list: some_function_on_true() 'ex' in ['one','ex','two'] => True. 'ex_1' in ['one','ex','two'] => False.
The best way is probably to use the list method .index. For the objects in the list, you can do something like: def __eq__(self, other): return self.Value == other.Value with any special processing you need. You can also use a for/in statement with enumerate(arr) Example of finding the index of an item that has value > 100.
- From Dive Into Python: >>> li ['a', 'b', 'new', 'mpilgrim', 'z', 'example', 'new', 'two', 'elements'] >>> li.index("example") 5.
- If you just want to find out if an element is contained in the list or not: >>> li ['a', 'b', 'new', 'mpilgrim', 'z', 'example', 'new', 'two', 'el...
- Here is another way using list comprehension (some people might find it debatable). It is very approachable for simple tests, e.g. comparisons on o...
- assuming you want to find a value in a numpy array, I guess something like this might work: Numpy.where(arr=="value")[0].
- There is the index method, i = array.index(value), but I don't think you can specify a custom comparison operator. It wouldn't be hard to write you...
- I use function for returning index for the matching element (Python 2.6): def index(l, f): return next((i for i in xrange(len(l)) if f(l[i])),...
- The index method of a list will do this for you. If you want to guarantee order, sort the list first using sorted(). Sorted accepts a cmp or key pa...
- how's this one? def global_index(lst, test): return ( pair[0] for pair in zip(range(len(lst)), lst) if test(pair[1]) ). Usage: >>> global_inde...
- I found this by adapting some tutos. Thanks to google, and to all of you ;)
To search a list item in python is easy and we can perform this action in a few different ways like using the python list index() method, using linear search, and, using the in operator. In this article, we will explore these options for searching a list item in python.
Binary search. Sorting and searching are two of the most frequently needed algorithms in program design. These algorithms have evolved to take account of this need. Part of Computer Science ...
Aug 17, 2020 · On Career Karma, learn how to find items in a Python list using “in”, a linear search, the index () method, and a list comprehension.
Feb 26, 2024 · When working with lists in Python, a common task is to determine if an element is present. Given a list, such as [4, 'blue', 8, 'red'], we might want to check if the string 'blue' is an element of the list. This article explores five effective methods to perform this search operation, each with examples and use-cases.
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