In this Python tutorial, we will learnhow to find the index of elements in a list by using Python. Also, we will cover these topics. Show
Python find index of element in list
Syntax: Here is the Syntax of the index() method list.index( element, start, end )
Example: Lets take an example and check how to find the index of an element in a list new_lis = [82, 64, 189, 920, 452, 701] new_val = 920 result = new_lis.index(new_val) print(result)In the above code, we have created a list with integer numbers and then we will find the index of 920 in the given list. To do this task first we create a variable result and then assign a list.index() method to get the index value of that number. Here is the Output of the following given code Python find an index of an element in a list Read Square Root in Python Get index of elements in a Python list
Source Code: lis_1 = ['45', '92', '193', '193', '231', '190'] emp_lis = [] for m in range(0, len(lis_1)) : if lis_1[m] == '193' : emp_lis.append(m) print("Index no of '193':", emp_lis)Here is the implementation of the following given code Python find the index of an element in a list As you can see in the Screenshot the element is present at 2 and 3 positions. By using NumPy method
Source Code: import numpy as np new_list = [56,829,992,119,734,567,890] arr = np.array(new_list) result = np.where(arr == 119)[0] print(result)You can refer to the below Screenshot Python find the index of an element in a list As you can see in the Screenshot the element 119 is present at 3 positions. This is how to use the NumPy method to get the index of elements in a Python list. Also, check: Python find number in String Python find index of element in list closest to value
Example: new_lis = [21.34,15.4567,18.478,22.105,13.189] b = min(range(len(new_lis)), key=lambda m: abs(new_lis[m]-17.6)) print(b)Here is the Screenshot of the following given code Python find an index of the element in the list closest to value Read: Remove non-ASCII characters Python Python find index of element in list greater thanIn this example, we will use a Python lambda function to equate with the given value at each index and then, filter out the given condition. This method actually sets the index value as 0 and specifies the first item greater than the value. Example: my_lis = [109,134,12,83,10] new_output = list(filter(lambda m: m > 120, my_lis))[0] print(my_lis.index(new_output))In the above code first, we have initialized a list my_lis and then used the filter+ lambda() function to get the index of elements in a list that is greater than 120. Once you will print new_output then the output will display the index number which is greater than 120 that is 1:134. Here is the Output of the following given code Python find an index of the element in list greater than Read: Python convert binary to decimal Python find index of element in list of lists
Source Code: new_lis_lis = [["98","85","112","321","405"],["189","239","706","148","227"]] def find(m): for x, new_val in enumerate(new_lis_lis): try: y = new_val.index(m) except ValueError: continue yield x, y new_result = [z for z in find('321')] print(new_result)Here is the execution of the following given code Python find an index of the element in a list of lists As you can see in the Screenshot the element is present at 3 positions. Read: Python Count Words in File Python find index of element in list with condition
Example: new_lis = [1877,18,77,30,77,45,567] output = [ i for i in range(len(new_lis)) if new_lis[i] == 77 ] print("Get index number from list:",output)In the above code, we have to find the index number of 77 by using list comprehension. Once you will print output then the result will display the index number of 77 that is 2 and 4. You can refer to the below Screenshot Python find an index of an element in the list with condition Also, check: How to Find Duplicates in Python DataFrame Python find index of item in list
Source code: new_lis = [73,123,64,52,74,86,32,64,64] output = [m for m in range(len(new_lis)) if new_lis[m] == 64] print("Find index of element in list:",output)Here is the Screenshot of the following given code Python find an index of the item in a list As you can see in the Screenshot the element is present at 2 7 and 8 positions. Read: Case statement in Python Python find index of item in list containing string
Source Code: new_list = ['George', 'Micheal', 'Micheal', 'John', 'Micheal', 'Potter'] emp_lis = [] for m in range(0, len(new_list)) : if new_list[m] == 'Micheal' : emp_lis.append(m) print("Index no of 'Micheal':", emp_lis)You can refer to the below Screenshot Python find the index of an item in a list containing a string Read: How to Reverse a List in Python Python get index of element in list by value
Example: new_lis = [28, 190, 210, 567, 912, 678] new_val = 210 result = new_lis.index(new_val) print(result)In the above code, we have created a list new_lis and then initialize a variable new_val in which we have to assign the value 210. Now to find the index number of 210 we have to use the list.index() method. Here is the implementation of the following given code Python get an index of an element in the list by value Also, read: Get First Key in dictionary Python Python find index of item in list without exception
Source Code: my_new_lis = [56,92,17,39,115,189,459,512] new_output = [i for i, j in enumerate(my_new_lis) if j == 115] print("Element is present at index:",new_output)You can refer to the below Screenshot Python find an index of the item in a list without exception As you can see in the Screenshot the element is present in the 4th position. Finding an index of the item in a list without exception
Example: new_element = [27,39,128,739,367,734] try: new_val = new_element.index(420) except ValueError: new_val = 2 print(new_val)Here is the Screenshot of the following given code Python find an index of the item in a list without exception This is how you can find the index of elements in the list without exception. Read: Python dictionary increment value Python find index of item in list case insensitive
Example: Search_ele = 's' my_new_lis1 = ['M', 'Q', 'S', 'T', 'Z', 'H', 'W', 'A'] new_result = [item.lower() for item in my_new_lis1] b = new_result.index(Search_ele.lower()) print(b)Here is the execution of the following given code Python find an index of the item in list case insensitive As you can see in the Screenshot s is available at the 2nd position. Read: Python dictionary of lists Python get index of item in list while iterating
Source Code: new_lis = ['Micheal', 'John', 'Micheal'] for m in range(len(new_lis)): print((m, new_lis[m]))Here is the implementation of the following given code Python get the index of an item in a list while iterating Get the index of an item in a list while iteratingBy using the enumerator() method we can solve this particular task and this method will help the user to iterate items through a sequence and this function takes in an iterable as a parameter such as lists. Example: list_value = [46, 81, 72, 39, 38, 1, 89,987,705,409] for x, y in enumerate(list_value): print(list((x, y)))You can refer to the below Screenshot Python get the index of an item in a list while iterating Read: Python dictionary extend Python get index of item in list with default
Source Code: my_new_val = [78,39,117,84,47,290] for z in range(0,len(my_new_val)): print([z])Here is the Output of the following given code Python get the index of an item in a list with default Python get index of element in list if exists
Example: Student_name = ['Olijah', 'William', 'Chris', 'James', 'Potter'] select_name = 'William' if select_name in Student_name: new_output = Student_name.index(select_name) print("Element exist in list:",new_output) else: print("Element does not exist in list:",select_name)In the above code first, we have created a list and used an operator to check if the item william exists in a list or not then use the index() method will get the index number of william if it exists. Here is the execution of the following given code Python get an index of the element in a list if exists As you can see in the Screenshot the element has 1st position. Read: Python string to list Python find index of item in list regex
Source Code: You can use the below snippet to execute this program import re new_lis1 = ['Germany', 'China', 'Switzerland'] new_output = [m for m, item in enumerate(new_lis1) if re.search('China', item)] print("element index:",new_output)Here is the Screenshot of the following given code Python find an index of the item in list regex Read: Python Dictionary Copy Python find a position of an item in a list
Example: fruit_name = ['Banana', 'Grapes', 'Mangoes', 'Apple'] result = fruit_name.index('Mangoes') print("Position of element in list:",result)You can refer to the below Screenshot Python find a position of an item in a list As you can see in the Screenshot the element is present in the 2nd position. Read: Python NumPy Random Python get index of max element in a list
Source code: list_elements = [89, 117, 734,864] new_val = max(list_elements) result = list_elements.index(new_val) print("Maximum element index:",result)In the above code, once you will print result then the output will display the index number of the maximum element that is 864. Python get the index of the max element in a list As you can see in the Screenshot the maximum element is present in the 3rd position. Read: Python dictionary multiple keys Python find index of smallest element in list
Example: min_list_my = [89, 64, 734,864,1167,23,45] new_val = min(min_list_my) result = min_list_my.index(new_val) print("Smallest element index:",result)You can refer to the below Screenshot Python find an index of the smallest element in a list As you can see in the Screenshot the minimum element is present in the 5th position. Find index of duplicate elements in list Python
Source Code: numbers_list = [83, 71, 83, 45, 83, 21, 11] new_output = [m for m, new_val in enumerate(numbers_list) if new_val in numbers_list[:m]] print("Duplicate element index:",new_output)Here is the Screenshot of the following given code Find an index of duplicate elements in list Python This is how to find the index number of duplicate values Get the index number of duplicate valuesBy using the duplicated and where() method we can easily perform this particular task. In Python, duplicated() method checks the condition of whether duplicate values are available in the list or not, and the np.where() function returns the indices of duplicate values. Source Code: import numpy as np import pandas as pd my_list = [78,489,55,78,92,78] b=pd.DataFrame(my_list) new_result = np.where(b.duplicated()) print("Index number of duplicate values:",new_result)Here is the execution of the following given code Find an index of duplicate elements in list Python Python find index of multiple elements in list
Source Code: num_lis = [89,145,734,819] result = {new_ele: m for m, new_ele in enumerate(num_lis)} search_ele = [734,145] b = [result.get(new_val) for new_val in search_ele] print("Multiple index:",b)In the above code, once you will print b then the output will display the index number of 734 and 145. You can refer to the below Screenshot Python find an index of multiple elements in a list Python get index of element in list NumPy
Source Code: import numpy as np new_numbers = [21,178,567,134,925,120,670] new_arr = np.array(new_numbers) result = np.where(new_arr== 134)[0] print(result)Here is the execution of the following given code Python get an index of an element in list NumPy As you can see in the Screenshot the element is present in the 3rd position. Python find index of common elements in two lists
Example: new_lis1=[87,56,36,77,58] new_lis2=[56,44,39,12,13] result = set(new_lis1).intersection(new_lis2) index_lis1 = [new_lis1.index(m) for m in result] index_lis2 = [new_lis2.index(m) for m in result] print(index_lis1,index_lis2)Here is the Output of the following given code Python find an index of common elements in two lists Python get index of item in list comprehension
Example: int_numbers = [78, 68, 156, 289, 213, 71] new_output = [z for z in range(len(int_numbers)) if int_numbers[z] == 156] print(new_output)Here is the Screenshot of the following given code Python get the index of an item in a list comprehension This is how to get the index of an item in a list by using the Python list comprehension method. You may also like the following Python tutorials:
In this Python tutorial, we have learnedhow to find the index of elements in a list by using Python. Also, we have covered these topics.
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