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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 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.
- Checking If Something Is Inside
- Filtering A Collection
- Finding The First Occurrence
- Finding The Location of An Item
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:
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 a generatorwhich you can imagine as a sort of lazy list that will only be built as soon as you iterate through it. By the way, the first one is exactly equivalent to in Python 2. Here yo...
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 not really well-known). You can also use which will return the first match or raise a StopIterationif none is found. Alternatively, you can use
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:
Jun 9, 2015 · Using .find to search a string inside a list. I want to loop through a list of strings... eg: I want to loop through the list items and search for the location of 'Hello!' within the string in each case an record its location.
Feb 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 cover in depth: An overview of lists in Python. How indexing works. Use the index() method to find the index of an item. 1.
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.
Feb 15, 2023 · In Python, finding a specific word or element within a list is a familiar task developers often search for. This tutorial will teach us four effective methods to find a word in a list. Table Of Contents. Method 1: Using the 'in' Keyword. Find a word in a list. Find multi-words in a list. Method 2: Using the index () method.
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Sep 16, 2021 · In this article, we’ll cover the most effective ways to find an item in a Python list. What Is a Python List? A list in Python is a collection of elements. The elements in a list can be of any data type: >>> cool_stuff = [17.5, 'penguin', True, {'one': 1, 'two': 2}, []]
