locate value in list python

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https://stackoverflow.com/questions/9542738/find-a-value-in-a-list
Find a value in a list [duplicate]
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1737edited Aug 15, 2022 at 0:38
As for your first question: "if item is in my_list:" is perfectly fine and should work if item equals one of the elements inside my_list. The item must exactly match an item in the list. For instance, "abc" and "ABC" do not match. Floating point values in particular may suffer from inaccuracy. For instance, 1 - 1/3 != 2/3.
As for your second question:

3 in [1, 2, 3] # => True
Filtering a collection
That is, finding all elements in a sequence that meet a certain condition. You can use list comprehension or generator expressions for that:
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python - Find a value in a list - Stack Overflow
For lists, there's also the index method that can sometimes be useful if you want to know wherea certain element is in the list: However, note that if you have duplicates, .indexalways returns the lowest index:...... If there are duplicates and you want all the indexes then you can use enumerate()instead: See more
Checking If Something Is Inside
This is the use case you describe: Checking whether something is inside a list or not. As you know, you can use the inoperator for that: See more
Filtering A Collection
That is, finding all elements in a sequence that meet a certain condition. You can use list comprehension or generator expressions for that: The latter will return … See more
Finding The First Occurrence
If you only want the first thing that matches a condition (but you don't know what it is yet), it's fine to use a for loop (possibly using the elseclause as well, which is … See more
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WEBFeb 24, 2022 · finding the index using the index() list method, using a for-loop, and finally, using list comprehension and the enumerate() function. Specifically, here is what we will …
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Python: finding an element in a list - Stack Overflow
WEBFor 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 …
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From Dive Into Python: >>> li ['a', 'b', 'new', 'mpilgrim', 'z', 'example', 'new', 'two', 'elements'] >>> li.index("example") 5.
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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...
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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...
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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...
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assuming you want to find a value in a numpy array, I guess something like this might work: Numpy.where(arr=="value")[0].
19
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...
8
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])),...
6
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...
4
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...
2
I found this by adapting some tutos. Thanks to google, and to all of you ;)
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python - Fastest way to check if a value exists in a list Sep 26, 2011
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Find the Index of An Item: Where is it in a Python List? - Codefather
WEBJan 22, 2022 · To know where in a Python list a specific item is you can use the list index () method that returns the index of the item if the item is in the list. Otherwise, it raises a …
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WEBJul 27, 2023 · To find the index of an item in a list, specify the desired item as an argument to the index() method. This method returns the zero-based index of the item. l = [30, 50, …
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How to find a list item in Python?Python List index () method We can easily find an item from the python list by using the index() method. This method simply returns the index position of the list item. At first, it checks, if the items exist in the list or not. If it finds the item, it will return the specific position otherwise gives a ValueError that it is not found.
How to search a list item in python - CodeSource.io
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How to find position in a list in Python?Example: Python list index () method is used to find position of element in list Python. It returns the position of the first occurrence of that element in the list. If the item is not found in the list, index () function raises a “ ValueError ” error.
Python List index() - GeeksforGeeks
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How to search a list in Python?For that, Python's built-in index() method is used as a search tool. The syntax of the index() method looks like this: Let's break it down: my_list is the name of the list you are searching through. .index() is the search method which takes three parameters. One parameter is required and the other two are optional. item is the required parameter.
Python Find in List – How to Find the Index of an Item or Element in a List
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How to find the nearest value in a list in Python?Python offers a number of features to help find the nearest value and its index in a list. Examples: Let's create a list of random floats between 0 and 10: this code will generate for example: Goal: find nearest value of: and its index One approach is to use a Lambda expression which provide a simple and powerful way to create anonymous functions:
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Python List Index: Find First, Last or All Occurrences • datagy
WEBFeb 28, 2022 · Python List Index Method Explained. The Python list.index() method returns the index of the item specified in the list. The method will return only the first instance of …
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WEBAug 17, 2020 · How do you find an item in a Python list? It’s a question all Python coders encounter at some point. Luckily, the language offers a number of ways in which you …
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WEBNov 2, 2023 · To find a value in a Python list, you can use various approaches. In this answer, we will explore two common methods: using the. index () method and using a …
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WEBTo find an element in a list, you can use the in keyword. This keyword allows you to check if an element is in a list, and returns a boolean value indicating whether the element was …
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How to search a list item in python - CodeSource.io
WEBTo 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 …
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WEBSep 25, 2011 · and I want to know where in the list the value of 3 is..but without using a for loop to go through the entire list. Is that possible? I'm already going through a very large …
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