Do you know how to use enumerate in Python? Have you ever thought about the process of enumerating in Python? Let’s experience what is enumerated in Python.
But before we start the programming journey, let’s know what is meaning of enumerate is.
Enumerate simply means to count something and produce it one by one. In this article, we will see what enumerate does in Python and how it works. Let us see what we will learn in this article.
A Quick Overview Of The Article:
In this article on how to use enumerate in Python, we will dive into the concept of Python enumerate. We will also learn why do we use enumerate in Python. Have a look below to learn more!
- Enumerate is a built-in method in Python that is used to access each element of an iterable and keeps a count of its occurrence in the entire iterable. If you’re working with lists, knowing How to Find Index in List Python can further help in efficiently managing and retrieving elements from lists.
- This method accepts any iterable like string, list, etc, and returns an enumerate object.
- It simplifies the process of iteration and thus, helps in reducing the complexity of your programs.
- Its ability to access the element and its index during the process of iteration enhances the code’s clarity as well
Further, we will also see how to implement enumerate in Python using example codes. So, let’s begin!
What Is Enumerate In Python? Know More
Before we learn the actual implementation, let us start by understanding the basics of enumerate and what enumerate does in Python.
Enumerate is an inbuilt function of Python that iterates over a structure like lists, strings, etc and accesses its elements along with their indexes. To understand how different data types interact with Python loops, check out our guide on Different Kinds of Python Data Types. It helps in getting rid of complex iterations and reduces the time complexity of your code as well.
Generally, it will take a single line to generate the count of the elements. As well as it will distribute the elements with the numbers. If you’re working with large lists and variables, understanding Ways to Delete a Variable in Python will help in efficient memory management.
This will help to find out the elements in a big string easily.
General Syntax: enumerate(name, starting_value)
The enumerate() function takes two arguments. These are:
- name: This is the name of the data structure that you want to iterate over.
- starting_value: This signifies the starting point of the count value when you start iterating. By default, this value is zero.
In the case of List & String enumerate will provide the output as another List. Then if needed you have to remove the brackets from both sides of the List.
How To Use Enumerate In Python? Read Below
There are mainly two types of methods to use enumerate in Python. Otherwise, there is no way to use such things in Python. Let’s make a list of those methods:
- Using Simple Enumerate Syntax
- Using Enumerate Syntax & Loop
Of these, the first one is the most commonly used method. This method is applicable for both Lists & Strings. But the loop method is only applicable to the List method only.
The second method is quite long. It is advisable to use only the first method. As it will save the time of the program. It will efficiently help the time complexity of the program.
Let’s look at the methods one by one.
How To Use Enumerate In Python Using Simple Enumerate Syntax:
To use the enumerate function in this case, first, we have to declare a List in Python and provide the elements to it. Then we have to do operations on it.
The enumerate function returns the output in the form of an enumerate object that adds a counter to an iterable that is it returns the count value before the item. You can convert this object into any other kind of data type like list, tuple, python sets, etc. as well.
Now, let us learn how to use this built-in function by looking at some easy coding examples of enumerate in Python.
Let us first use the enumerate() function while keeping the starting value as the default value i.e. 0. This printing & conversation can be done in a single line.
General Syntax: list(enumerate(list-name))
Then we will try to enumerate the List from a programmer-specific output. Suppose, we try to enumerate this thing from 100. Then we need to provide the starting number as 100.
General Syntax: list(enumerate(list-name, 100))
Code To Use Enumerate In Python Using Simple Enumerate Syntax
# Declaring The List
sub = ['Bengali', 'English', 'Math']
# Printing Enumerate Counting From Zero
print("Enumerate Form Counting Zero: ")
print(list(enumerate(sub)))
# Printing Enumerate Counting From 100
print("Enumerate Form Counting 100: ")
print(list(enumerate(sub,100)))
Let’s look at the output of the above code. Hence, we come to know how to use enumerate in Python.
Output:
From the above output, we can see that in our first case starting with the default value as zero, the enumerate function returned the object where each element in the list sub is written after its index count value.
Whereas, in the second case, when we provided the starting value as 100, the counter before each element is greater than 100. This is because, for the element at index 0, the counter becomes 100+0. Similarly for the item at index 1, the count value becomes 100+1, and so on.
Still, wondering how this works? Feel free to seek guidance from a group of skilled professionals at CodingZap, if you’re curious about how this operates. Our Python Homework Assistance provides expert support for Python programming assignments and projects.
Now, we will look into the procedure for the String.
For this case, we need to declare a string there. Let us call this string ‘name’ and assign the value ‘Codingzap’ to it. We also have to provide value there.
Then we will try to do the same case for String also. Here, in this case, also the syntax will be the same. But in place of the List name, we have to provide the String name there.
General Syntax: list(enumerate(string-name))
You might have noticed, that the syntax for this scenario looks a little different. Observed the keyword ‘list’ there?
In this case, we have performed type conversion, so that we receive the right datatype of the output. Now, let us have a look at the code below.
# Declaring The String
name = 'Codingzap'
# Printing Enumerate Counting From Zero
print("Enumerate Form Counting Zero: ")
print(list(enumerate(name)))
Let’s look at the output of the above code. Hence, we come to know how to use enumerate in Python.
Output:
Again, we see that the output returned in this case is enclosed in square brackets [] signifying that the enumerate object has been type converted to a list.
Inside this new list, we can see something like a list of tuples. Here, each item of the string has a count value before it that represents its index count.
How To Use Enumerate In Python Using Simple Enumerate Syntax & Loop:
In such cases, we have to declare a List. As well as we have to provide the values there. When working with lists and loops, it’s also crucial to understand The Difference Between A = A+B And A += B In Python to prevent unnecessary memory usage.
Then using a for loop in Python we have to run the List in the enumerate function. This will provide enumerated output in every single line. Here the brackets will also be available at every end of the data.
If the programmer needs the output without the brackets, then they have to follow the next method. There we have run a count number that will run with them for a loop. Hence it will provide the output without brackets.
Also, there is a way to start counting from the new value. The approach for that will also same as the previous methods.
Code To Use Enumerate In Python Using Simple Enumerate Syntax & Loop:
# Declaring The List
sub = ['Bengali', 'English', 'Math']
# Normal Way To Print Enumerate In Loop
print("Normally Print Using Loop: ")
for topic in enumerate(sub):
print(topic)
# Way To Print Enumerate Without Brackets
print("Printing Without Brackets: ")
for num, topic in enumerate(sub):
print(num, topic)
# Changing Default Start Value And Printing
print("Printing From Another Start Value: ")
for num, topic in enumerate(sub, 5):
print(num, topic)
Let’s look at the output of the above code. Hence, we come to know how to use enumerate in Python.
Output:
Let us break down this output to understand what is happening here. In the first loop, we have simply printed the return value of the enumerate object. Each item is printed in different lines.
In case you want to print index value and item without parentheses, you can follow the second loop in which we are treating both these return values as different variables.
To print using the start index value in enumerate, use the third loop and you will see expected the counter added before the item when the output is printed.
How To Stop Enumerate In Python? Keep Reading!
Now that you know how to implement the enumerate function, let us learn another concept related to it. What if you want to enumerate an iterable until a certain point? What if you want to stop the enumeration process once a condition has been reached?
How can we stop enumeration in Python? Enumerate() helps us to keep track of the input and its index. In case we are using loops, we can stop that loop that utilizes the function enumerate() by using the break statement. Another method to do this is the slicing of an iterable.
Let us see how we can perform both these methods using coding examples.
sub = ['Bengali', 'English', 'Science', 'Math']
for num, topic in enumerate(sub):
# Add a condition to break out of the loop when a specific condition is met
if topic == 'Science':
break
else:
print(num, topic)
In the above code, we have used the if-else condition within the loop. Therefore, when the if statement gets executed and we have reached the index of the ‘Science’ item, we break out of the loop and stop enumerating.
Now, let us try this using the slicing technique for an iterable. Here we will provide the starting index and stopping index within the enumerate syntax. Take a look at the code below.
sub = ['Bengali', 'English', 'Science', 'Math']
start = 0
stop = 2
for num, topic in enumerate(sub[start:stop], start=start):
print(num, topic)
Here, we have used 0 as the start index and 2 as the stop index. Using these in the code will automatically stop the execution of the loop when we have reached the stop index.
The output for both of these codes is given below. Have a look!
Output:
Here, we stop or break out of the loop upon reaching ‘Science’. Since the default start index was 0, the code prints, Bengali and English.
Indexing in Python lists may present challenges, and to tackle this issue, we’ve developed a detailed article aimed at enhancing your understanding.
Conclusion:
As we saw the enumeration in Python is very important to use. It reduces the workload related to the fields of String & List. It counts & produces the elements in the List easily.
Key Takeaways:
Through this article, we were able to learn that-
- The Python enumerate function is an in-built method that helps us to keep track of the index and item when we iterate over an iterable data structure.
- The general syntax to use this is: enumerate(iterable_name, start_index) and it returns an object that can be type-converted.
- We can implement this method in a single line as well as using loops as it helps us to enhance our code by reducing time and space complexity.
- You can specify conditional statements or use slicing techniques to include stop parameters while iterating using enumerate()
FAQs (Frequently Asked Question by Students)
Yes! Enumerate() can be used for all iterable data types or objects like strings, tuples, etc.
You can use enumerate() in a loop by using the given syntax: for index, item in enumerate(iterable_name)
Enumerate is not a generator function. It returns an enumerated object as the return value.
Although Python dictionaries do not have a specific order, the function can be used with the ‘item’ method to iterate over key-value pairs in a dictionary.
