The Numpy library in Python comes with a number of useful functions to work with and manipulate arrays. In this tutorial, we will look at how to print a numpy array with elements separated by commas with the help of some examples.
Printing a Numpy Array
First, let’s see what we get when we directly print a numpy array.
import numpy as np # create numpy array ar = np.array([1, 2, 3, 4, 5]) # print the array print(ar)
Output:
[1 2 3 4 5]
Here, we created a numpy array of five numbers and then printed it using the print() function. You can see that the elements are printed with a space between them.
How to print a numpy array with commas?
You can use the numpy array2string() function to print a numpy array with elements separated by commas. Pass the array and the separator you want to use (“,” in our case) to the array2string() function.
The following is the syntax –
# print numpy array with "," separator print(np.array2string(ar, separator=","))
It returns a string representation of the array with the given separator.
Let’s now apply this function to the above array such that its elements are separated by commas on printing.
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# print array with "," as separator print(np.array2string(ar, separator=","))
Output:
[1,2,3,4,5]
The array elements are separated by commas.
If the printed array looks cluttered, you can specify , (a comma followed by a space) as the separator.
# print array with ", " as separator print(np.array2string(ar, separator=", "))
Output:
[1, 2, 3, 4, 5]
The elements now look less cluttered.
Use the repr() function
Alternatively, you can use the Python built-in repr() function to print a numpy array with commas. The repr() function is used to print the string representation of an object in Python.
Let’s look at an example.
print(repr(ar))
Output:
array([1, 2, 3, 4, 5])
The array elements are separated by commas. Note that the output is not exactly the same as what we got with the array2string() function.
Summary – Print Numpy Array with Comma as a Separator
In this tutorial, we looked at how to print a numpy array with a comma as a separator. The following are the steps mentioned in this tutorial –
- Create a numpy array (skip this step if you already have a numpy array to operate on).
- Use the numpy
array2string()function to get a string representation of the array with the desired separator (a comma in our case).
There are alternative methods as well, such as using therepr()function.
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