You have to convert the ints to strings and then you can join them:
','.join([str(i) for i in list_of_ints])
Finxter
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5 Best Ways to Join a List of Integers with Commas in Python - Be on the Right Side of Change
February 24, 2024 - Here, we use a list comprehension to convert every integer in the list to a string, and then the join() method concatenates these strings, separated by commas.
Top answer 1 of 5
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You have to convert the ints to strings and then you can join them:
','.join([str(i) for i in list_of_ints])
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You can use map to transform a list, then join them up.
",".join( map( str, list_of_things ) )
BTW, this works for any objects (not just longs).
How do I use the .join function on integers?
Say you have a mixed list, you are right, you can't join them: >>> data = ['cat', 1, 'hat', 2] >>> ', '.join(data) Traceback (most recent call last): File "", line 1, in TypeError: sequence item 1: expected str instance, int found So you have to convert all the elements of the list into strings, first: >>> text = [str(x) for x in data] # List comprehension >>> ', '.join(text) 'cat, 1, hat, 2' Or put more succinctly: print(', '.join(str(x) for x in data)) Note that in my short version, I don't use a list comprehension, as the square brackets are missing. Instead I use a very similar "generator expression", which happens to still work for join. https://stackoverflow.com/questions/364802/how-exactly-does-a-generator-comprehension-work More on reddit.com
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February 19, 2020Convert a comma separated property to a List
.SelectMany More on reddit.com
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August 16, 2022Using C, convert a dynamic int array to a comma-separated string as cleanly as possible
I have a dynamically-allocated array of unsigned integers which I need to convert to a comma-separated string for logging. Does it really have to be converted to a string? Doesn't the logging interface provide a printf-like function that you can use? If not, I humbly submit that the logging interface fucking sucks. More on reddit.com
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November 16, 2009Most elegant way of removing comma at the end of a list
You could not stitch the list together but use a built in string joining method (eg. in c# string.join) More on reddit.com
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December 9, 2019Tutorial Reference
tutorialreference.com › python › examples › faq › python-how-to-join-list-of-integers-to-string
How to Join a List of Integers into a String in Python | Tutorial Reference
March 29, 2025 - The most concise and Pythonic way to join a list of integers into a string is to use the map() function and str.join(): ... map(str, my_list): This applies the str() function to each element in my_list, effectively converting each integer to its string representation.
DigitalOcean
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Join Python List: Methods, Examples, and Best Practices | DigitalOcean
June 16, 2026 - Learn how to join a Python list using join(), +, extend(), and itertools.chain(). See real code examples, benchmarks, and best practices.
Reddit
reddit.com › r/learnpython › how do i use the .join function on integers?
r/learnpython on Reddit: How do I use the .join function on integers?
February 19, 2020 -
I have a function that can add commas between lists and print them out as strings
def commaCode(listValue):
listValue.insert(-1, 'and')
NewlistValue = ', '.join(listValue)
print(NewlistValue)Here's the output:
cat, bat, and, sat
But I need this to work for integers as well. (and combinations of strings and integers).
How do I use the .join function on integers?
Top answer 1 of 3
7
Say you have a mixed list, you are right, you can't join them: >>> data = ['cat', 1, 'hat', 2] >>> ', '.join(data) Traceback (most recent call last): File "", line 1, in TypeError: sequence item 1: expected str instance, int found So you have to convert all the elements of the list into strings, first: >>> text = [str(x) for x in data] # List comprehension >>> ', '.join(text) 'cat, 1, hat, 2' Or put more succinctly: print(', '.join(str(x) for x in data)) Note that in my short version, I don't use a list comprehension, as the square brackets are missing. Instead I use a very similar "generator expression", which happens to still work for join. https://stackoverflow.com/questions/364802/how-exactly-does-a-generator-comprehension-work
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.join() is a string method, so in order for u to use the .join method on integers , u have to convert those values into a string.
Dot Net Perls
dotnetperls.com › join-python
Python - String join Examples (Get String From List) - Dot Net Perls
30] # Map each integer to a string with str. list_mapped = map(str, list) # Join together with comma. result = ",".join(list_mapped) print(result) 10,20,30 · It is best to avoid calling join() more than needed. For complex data structures, keep all elements in lists or maps—avoid excessive split() and join calls. Join() is called on a string—often a string literal. This syntax confuses most beginning Python developers.
Finxter
blog.finxter.com › home › learn python blog › 5 best ways to convert a python list of ints to a comma-separated string
5 Best Ways to Convert a Python List of Ints to a Comma-Separated String - Be on the Right Side of Change
February 24, 2024 - The iterable is converted to a comma-separated string through the join() method. For situations where CSV output is desired for tabular data, Python’s csv.writer() can be an excellent tool.
Wsldp
elearning.wsldp.com › python3 › how-to-convert-python-list-to-comma-separated-string
How To Convert Python List to Comma Separated String
September 16, 2021 - To convert a Python list to a comma-separated string, you will want to use the join() method. ... The join() method creates a string where the individual list items are separated by a given separator character.
Simplilearn
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How to Convert a List to String in Python Easily [2026]
3 weeks ago - Learn the fastest, cleanest ways to convert a Python list to a string using join(), map(), list comprehension, and more, with copy-paste code examples.
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Bobby Hadz
bobbyhadz.com › blog › python-convert-comma-separated-string-to-list
Convert a comma-separated String to a List in Python | bobbyhadz
April 9, 2024 - We passed the int() class to the map() function, so the class will get invoked with each string from the list. The last step is to use the list() class to convert the map object to a list. Use the str.join() method to convert a list to a ...
Note.nkmk.me
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Concatenate Strings in Python: +, +=, join(), and more | note.nkmk.me
May 19, 2025 - You can concatenate a list of strings ... empty string ('') will simply concatenate the list elements, while using a comma (,) will create a comma-separated string....
Medium
arccoder.medium.com › python-fastest-convert-list-of-integers-to-comma-separated-string-7818494ab8f6
Python: Fastest — Convert list of integers to comma separated string | by Akshay Chavan | Medium
July 27, 2020 - Recently I had to look for ways to converts a list of integers to a comma separated string in python. A simple google search lead me to a couple of stack overflow articles [1] and [2], where I found a number of ways to complete the task. However, I had to find the fastest way to accomplish the task as I had to convert integer lists of length between 10000 and 12000, that too a multiple times. So, I decided to run some experiments. Here is the sample list to convert, with the 7 contenders and outputs:
Bobby Hadz
bobbyhadz.com › blog › python-join-integer-list
Join a List of Integers into a String in Python | bobbyhadz
April 8, 2024 - Use the map() function to convert the integers in the list to stings. Call the str.join() method on a string separator.
freeCodeCamp
freecodecamp.org › news › python-list-to-string-join-example
List to String Python – join() Syntax Example
April 7, 2022 - So again, the syntax is ... convert into a string]). In this case, I used a comma as my separator, but you could use any character you want. Here. Let's join this again, but this time, let's add a space after the comma so the resulting string will be a bit easier to read: >>> exampleCombinedString = ', '.join(exampleList) >>> exampleCombinedString 'car, house, computer' There you go. There are a number of ways to concatenate lists in Python...
GeeksforGeeks
geeksforgeeks.org › python › convert-lists-to-comma-separated-strings-in-python
Convert Lists to Comma-Separated Strings in Python - GeeksforGeeks
July 23, 2025 - In this approach, list comprehension is used to add commas to each element of the list, and then join combines these elements into a single string.
Centron
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Python Join List - Tutorial – centron
February 7, 2025 - Launch a server → · We can use python string join() function to join a list of strings. This function takes iterable as argument and List is an iterable, so we can use it with List.
BlueVPS
bluevps.com › blog › python join(): a complete guide to merging lists and python string join
A Complete Guide to Merging Lists and Python String Join | BlueVPS
June 18, 2025 - ... The Python list join() method is used to combine a list of strings into one single string, inserting a specified separator between each element. ... separator: A string that you want to insert between each element (e.g., a comma ...
Code.mu
code.mu › en › python › manual › string › join
The join method - merges list elements into a string in Python
The join method merges the elements of a list into a string with the specified separator (space, comma, etc.).
StrataScratch
stratascratch.com › blog › python-list-manipulation-convert-lists-to-strings
Python List Manipulation: Convert Lists to Strings - StrataScratch
April 4, 2025 - Because integers can’t be joined as-is, we convert each item in the list to a string with this: str(item) for item in row. Then, we join all the string items using join() and a comma separator to create a single line.
Hyperskill
hyperskill.org › university › python › join-method-in-python
Python join() Method: Join Strings from a List (with Examples)
June 5, 2026 - For example, if you have a list of words ["Hello", "world", "Python"] and want to join them with spaces, you would use join() like this: ... The result would be "Hello world Python". You can choose any separator, such as a comma, dash, or even no separator at all.