Python: Fastest — Convert list of integers to comma separated string
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.
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1. Using str.join[] function
The preferred approach to creating a comma-separated string from a list of strings is with the str.join[] function. This efficiently concatenates each member of the list using a separator and returns a new string. Here’s an example of its usage:
1 2 3 4 5 6 7 8 | if __name__ == '__main__': chars = ['A', 'B', 'C', 'D', 'E'] delim = ',' s = delim.join[chars] print[s] |
DownloadRun Code
If you have a list of integers, you should convert each element to a string first. This can be efficiently done using the map[] function.
1 2 3 4 5 6 7 8 | if __name__ == '__main__': nums = [1, 2, 3, 4, 5] delim = ',' s = delim.join[map[str, nums]] print[s] |
DownloadRun Code
Convert List to Comma-Separated String in Python
Python Python List Python String
Created: January-03, 2022
We can use a list to store different elements under a common name. A string is a collection of characters.
We will convert a list to a comma-separated string in this tutorial.
How to convert list to comma-separated string in Python
python1min read
Python has a built-in String join[] method by using that we can convert a list to an comma-separated.
Here is an example that combines the following list into a comma-separated string.
myList = ["a", "b", "c"] x = ",".join[myList] print[x]
Output:
a,b,c
If you want convert a non-string types [like numbers, floats, booleans] then you can do it like this.
myList = [1, 5, 7] x = ",".join[map[str, myList]] print[x]
In the above code, we first converted the list of numbers into a string by executing the str[] function on each value in the array then combined it into a comma-separated string using join[] method.
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Mohammed AbualrobSoftware Engineer @ Cisco
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