Python | Count the elements in a list until an element is a Tuple

Last Updated : 01 Feb, 2023

In this problem, we need to accept a list. The list can have nested tuples. We need to count the elements in a list until a tuple has been encountered. Examples:

Input : [4, 5, 6, 10, (1, 2, 3), 11, 2, 4]
Output : 4

Input : [4, (5, 6), 10, (1, 2, 3), 11, 2, 4]
Output : 1

Method #1:

In this program we will use the concept of isinstance() to verify whether we are encountering a tuple or not in our path of count. For detailed guide on isinstance() visit isinstance in Python.

Python3

# Python program to count the items
# until a list is encountered
def Count(li):
    counter = 0
    for num in li:
        if isinstance(num, tuple):
            break
        counter = counter + 1
    return counter
 
# Driver Code
li = [4, 5, 6, 10, (1, 2, 3), 11, 2, 4]
print(Count(li))

Output:

Method #2: Using type() method

Python3

# Python program to count the items
# until a list is encountered
def Count(li):
    counter = 0
    for num in li:
        if type(num) is tuple:
            break
        counter = counter + 1
    return counter
 
# Driver Code
li = [4, 5, 6, 10, (1, 2, 3), 11, 2, 4]
print(Count(li))

Output

Method#3: Using recursion

Python3

def count_items(li,i):
    if type(li[i]) is tuple or i==len(li):
        return 0
    return 1 + count_items(li,i+1)
 
li = [4, 5, 6, 10, (1, 2, 3), 11, 2, 4]
print(count_items(li,0))
#This code is contributed by Vinay Pinjala.

Output

Time Complexity: O(n)

Auxiliary Space: O(n)

C

Chinmoy Lenka

Improve

Python - Concatenate Rear elements in Tuple List

Similar Reads

Python | Sort tuple list by Nth element of tuple

Sometimes, while working with Python list, we can come across a problem in which we need to sort the list according to any tuple element. These must be a generic way to perform the sort by particular tuple index. This has a good utility in web development domain. Let's discuss certain ways in which this task can be performed. Method #1: Using sort(

Python | Replace tuple according to Nth tuple element

Sometimes, while working with data, we might have a problem in which we need to replace the entry in which a particular entry of data is matching. This can be a matching phone no, id etc. This has it's application in web development domain. Let's discuss certain ways in which this task can be performed. Method #1: Using loop + enumerate() This task

Python - Raise elements of tuple as power to another tuple

Sometimes, while working with records, we can have a problem in which we may need to perform exponentiation, i.e power of tuples. This problem can occur in day-day programming. Let’s discuss certain ways in which this task can be performed. Method #1: Using zip() + generator expression The combination of above functions can be used to perform this

Python - Flatten tuple of List to tuple

Sometimes, while working with Python Tuples, we can have a problem in which we need to perform the flattening of tuples, which have listed as their constituent elements. This kind of problem is common in data domains such as Machine Learning. Let's discuss certain ways in which this task can be performed. Input : test_tuple = ([5], [6], [3], [8]) O

Python Program to Convert Tuple Matrix to Tuple List

Given a Tuple Matrix, flatten to tuple list with each tuple representing each column. Example: Input : test_list = [[(4, 5), (7, 8)], [(10, 13), (18, 17)]] Output : [(4, 7, 10, 18), (5, 8, 13, 17)] Explanation : All column number elements contained together. Input : test_list = [[(4, 5)], [(10, 13)]] Output : [(4, 10), (5, 13)] Explanation : All co

Python Program to find tuple indices from other tuple list

Given Tuples list and search list consisting of tuples to search, our task is to write a Python Program to extract indices of matching tuples. Input : test_list = [(4, 5), (7, 6), (1, 0), (3, 4)], search_tup = [(3, 4), (8, 9), (7, 6), (1, 2)]Output : [3, 1]Explanation : (3, 4) from search list is found on 3rd index on test_list, hence included in r

Python Program to Merge tuple list by overlapping mid tuple

Given two lists that contain tuples as elements, the task is to write a Python program to accommodate tuples from the second list between consecutive tuples from the first list, after considering ranges present between both the consecutive tuples from the first list. Input : test_list1 = [(4, 8), (19, 22), (28, 30), (31, 50)], test_list2 = [(10, 12

Python | Remove and print every third from list until it becomes empty

Given a list of numbers, Your task is to remove and print every third number from a list of numbers until the list becomes empty. Examples: Input : [10, 20, 30, 40, 50, 60, 70, 80, 90] Output : 30 60 90 40 80 50 20 70 10 Explanation: The first third element encountered is 30, after 30 we start the count from 40 for the next third element which is 6

Python - Convert Tuple String to Integer Tuple

Interconversion of data is a popular problem developer generally deal with. One can face a problem to convert tuple string to integer tuple. Let's discuss certain ways in which this task can be performed. Method #1 : Using tuple() + int() + replace() + split() The combination of above methods can be used to perform this task. In this, we perform th

Python - Convert Tuple to Tuple Pair

Sometimes, while working with Python Tuple records, we can have a problem in which we need to convert Single tuple with 3 elements to pair of dual tuple. This is quite a peculiar problem but can have problems in day-day programming and competitive programming. Let's discuss certain ways in which this task can be performed. Input : test_tuple = ('A'

Article Tags :

Practice Tags :

python