Python list to string without join

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Python list to string without join

Python is one of the most popular programming languages today, and in this tutorial we will learn various nuances of Python, including what is a list in python, what is a string, ways to change a list to a string and more. Let's start. A list in python is an ordered sequence that can hold a variety of object types, such as, integer, character or float. A list in python is equivalent to an array in other programming languages. It is represented using square brackets, and a comma(,) is used to separate two objects present in the list. A list and an array in other programming languages differ in the way that an array only stores a similar data type, meaning that an array is homogeneous in nature, but a list in python can store different data types at a time, and therefore it can either be homogeneous or heterogeneous. Below are some examples of homogeneous and heterogeneous lists in python: Homogenous Lists: Heterogeneous Lists: An item from the list can be accessed by referring to its index in the list. The indexing of elements in the list starts from 0. Let's take an example of the list we created in the last step. To access an element from the list, we pass the index of that element in the print function. As mentioned earlier, that indexing starts from 0, so when index [1] is passed, it gives the result as "dog". Similarly, if we pass the index, say [2], it will give the output 2.2 A string in python is an ordered sequence of characters. The point to be noted here is that a list is an ordered sequence of object types and a string is an ordered sequence of characters. This is the main difference between the two. A sequence is a data type composed of multiple elements of the same data type, such as integer, float, character, etc. This means that a string is a subset of sequence data type, containing all elements as characters. Here is an example of string in python and how to print it. For declaring a string, we assign a variable to the string. Here, a is a variable assigned to the string simplilearn. An element of a string can be accessed in the same way as we saw in the case of a list. The indexing of elements in a string also starts from 0. The join function is one of the simplest methods to convert a list to a string in python. The main point to keep in mind while using this function is that the join function can convert only those lists into string that contains only string as its elements. Refer to the example below. Here, all the elements in the list are individual string, so we can use the join function directly. Note that each element in the new string is delimited with a single space. Now, there may be a case when a list will contain elements of data type other than string. In this case, The join function can not be used directly. For a case like this, str() function will first be used to convert the other data type into a string and then further, the join function will be applied. Refer to the example given below to understand clearly. In this example, firstly we declare a list that has to be converted to a string. Then an empty string has to be initialized to store the elements. After that, each element of the list is traversed using a for loop, and for every index, the element would be added to the initialized string. At the end, the string will be printed using the print() function. The map function can be used in 2 cases to convert a list to a string. if the list contains only numbers. If the list is heterogenous The map() function will accept 2 arguments; str() function; that will convert the given data type into the string data type. An iterable sequence; each and every element in the sequence will be called by str() function. The string values will be returned through an iterator. At the end, the join() function is used to combine all the values returned by the str() function. List comprehension in python generates a list of elements from an existing list. It then employs the for loop to traverse the iterable objects in an element-wise pattern. To convert a list to a string, use Python List Comprehension and the join() function. The list comprehension will traverse the elements one by one, and the join() method will concatenate the list's elements into a new string and return it as output. An example of conversion of list to string using list comprehension is given below. Now, that we have completed the tutorial, let's make a quick revision. Firstly, we saw what is list in python and what are its two types and how to declare the same. Next, we learnt about strings and how string and list differ from each other. In the end, we also looked at 4 methods by which you can change a list to a string. These methods are: Using join() function Traversal of a list Using map() function List comprehension Looking forward to making a move to the programming field? Take up the Python Training Course and begin your career as a professional Python programmer In case you wish to master the A to Z of Python, enroll in our Python Certification Training today! And in case you have any questions regarding the tutorial, drop a comment below and our experts will help you out. To convert a list lst of strings to a string, use the ''.join(lst) method with an empty separator string between the elements. If you have a list of objects, first convert each element to a string and join the result with the generator expression ''.join(str(x) for x in lst). Problem: Given a list of elements. How to convert them to a string? Example: Given the following list of strings. lst = ['a', 'b', 'c'] You want to convert the list of strings to the following string: 'abc' What's the most Pythonic way of converting a list to a string? The answer depends on the nuances. Here's a quick overview before we dive into each of the methods: Exercise: Run the code! What's the most Pythonic way in your opinion? Method 1: Join List of Strings The most straightforward way is to use the string.join(iterable) method that concatenates all values in the iterable (such as a list) using the separator string in between the elements. lst = ['a', 'b', 'c'] s = ''.join(lst) The output is the following string: print(s) # abc Due to its conciseness and efficiency, this is the most Pythonic way of converting a list of strings to a string. However, the join() method expects that you pass a list of strings. If you have a list of non-strings, it will throw an error! Related article: The Ultimate Guide to Python Join Method 2: Join List of Non-Strings with Generator Expression So, what to do if you want to convert a list of general objects to a string? The most Pythonic way to concatenate a list of objects is the expression ''.join(str(x) for x in lst) that converts each object to a string using the built-in str(...) function in a generator expression. You can concatenate the resulting list of strings using the join() method on the empty string as a delimiter. The result is a single string value that's the concatenation of the objects' string representations. lst = [1, 2, 3] s = ''.join(str(x) for x in lst) print(s) # 123 This general method works for all objects (because all objects implement the __str__ method per default). It's the most Pythonic way of converting a list of non-string Related article: What's the most Pythonic way to join a list of objects? Method 3: String Concatenation with + Just for the sake of completeness, I want to highlight that you can also concatenate all strings in a list by using the + operator. If you have a list with a few objects, this is a viable option: lst = ['a', 'b', 'c'] s = lst[0] + lst[1] + lst[2] print(s) # abc This is inefficient because each + operator creates a new string. For n list elements, you create n-1 new strings in memory. Related article: The + operator for string concatenation. This must be slightly modified when concatenating a list of objects to a single string: Method 4: String Concatenation with + and str() Again, if you have a list of objects, you need to convert each object to a string first: # Method 4: String Concatenation with + and str() lst = [1.0, 2.0, 3.0] s = str(lst[0]) + str(lst[1]) + str(lst[2]) print(s) # 1.02.03.0 This is very tedious and it deserves to be titled the "least Pythonic way to convert a list to a string". You should prefer the general Method 2 that's not only shorter and more efficient, but also more readable and generally applicable. Method 5: Use Map + Join The map function allows you to convert each element to a string first. You can then join the strings using the standard string.join() method on the resulting iterable of strings. lst = [1, 2, 'hello', 3.2] s = ''.join(map(str, lst)) print(s) # 12hello3.2 This works beautifully for list of objects as well and it's quite Pythonic. Many Python coders like this functional style--but I don't consider it the most Pythonic one. Python code should be readable. Guido van Rossum, Python's creator, tried to avoid functional programming because he didn't find it readable compared to list comprehension or its generalization "generator expressions" (see Method 2). Related Article: The map() function in Python Method 6: Simple Loop Let's see what coders who come from another programming language such as Java would do: lst = [1, 2, 'hello', 3.2] s = '' for x in lst: s += str(x) print(s) # 12hello3.2 They'd first create an empty string. Then, they'd add the string representation of each list element to the string until all list elements are added. This is highly inefficient because of the repeated creation of new strings and it needs three lines instead of one. As it's often the case in Python, you can avoid loops by using Python's powerful built-in capabilities. Related article: Go vs Python Where to Go From Here? Enough theory. Let's get some practice! Coders get paid six figures and more because they can solve problems more effectively using machine intelligence and automation. To become more successful in coding, solve more real problems for real people. That's how you polish the skills you really need in practice. After all, what's the use of learning theory that nobody ever needs? You build high-value coding skills by working on practical coding projects! Do you want to stop learning with toy projects and focus on practical code projects that earn you money and solve real problems for people? If your answer is YES!, consider becoming a Python freelance developer! It's the best way of approaching the task of improving your Python skills--even if you are a complete beginner. If you just want to learn about the freelancing opportunity, feel free to watch my free webinar "How to Build Your High-Income Skill Python" and learn how I grew my coding business online and how you can, too--from the comfort of your own home. Join the free webinar now! While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students. To help students reach higher levels of Python success, he founded the programming education website . He's author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide. His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.

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