[Tut] How to Print a List Without Commas in Python

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How to Print a List Without Commas in Python

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Problem Formulation

Given a Python listof elements.

If you print the list to the shell using

Code:

print([1, 2, 3])

, the output is enclosed in square brackets and separated by commas like so:

Code:

[1, 2, 3]

But you want the list without commas like so:

Code:

[1 2 3]

Code:

print([1, 2, 3]) # Output: [1, 2, 3] # Desired: [1 2 3]

How to print the list without separating commas in Python?

Note that this is slightly different to those two problem variants—feel free to click there to learn more about those problem variants:

Recommended Tutorial: How to Print a List Without Brackets and Commas in Python?

Recommended Tutorial: Howhttps://blog.finxter.com/how-to-print-a-...in-python/to Print a List Without Brackets in Python?

Method 1: Unpacking Multiple Values into Print Function

The asterisk operator

Code:

*

is used to unpack an iterableinto the argument list of a given function.

You can unpack all list elements into the

Code:

print()

function to print all values individually, separated by an empty space per default (that you can override using the

Code:

sep

argument). For example, the expression

Code:

print('[', *lst, ']')

prints the elements in

Code:

my_list

, empty space separated, with the enclosing square brackets and without the separating commas!

Here’s an example:

Code:

lst = [1, 2, 3] print('[', *lst, ']') # [ 1 2 3 ]

You can learn about the ins and outs of the built-in

Code:

print()

function in the following video:



To master the basics of unpacking, feel free to check out this video on the asterisk operator:



Method 2: String Replace Method

A simple way to print a list without commas is to first convertthe list to a string using the built-in

Code:

str()

function. Then modify the resulting string representation of the list by using the

Code:

string.replace()

method until you get the desired result.

Here’s an example:

Code:

my_list = [1, 2, 3] # Convert List to String s = str(my_list) print(s) # [1, 2, 3] # Replace Separating Commas s = s.replace(',', '') # Print List Without Commas print(s) # [1 2 3]

The last line of the code snippet shows that the commas are removed from the output.

Method 3: String Join With Generator Expression

You can print a list without commas using the

Code:

string.join()

method on any separator string such as

Code:

' '

or

Code:

'\t'

. Pass a generator expression to convert each list element to a string using the

Code:

str()

built-in function.

Specifically, the expression

Code:

print('[', ' '.join(str(x) for x in my_list), ']')

prints

Code:

my_list

to the shell without separating commas.

Code:

my_list = [1, 2, 3] print('[', ' '.join(str(x) for x in my_list), ']') # Output: [ 1 2 3 ]

• The
  Code:

  string.join(iterable)
  method concatenates the elements in the given iterable.
  
  
• The
  Code:

  str(object)
  built-in function converts a given object to its string representation.
  
  
• Generator expressions or list comprehensions are concise one-linerways to create a new iterable based by reusing elements from another iterable.
  

You can dive deeper into generators in the following video:



Note: Combining the

Code:

join()

method with a generator expression and string concatenation is the recommended approach of choice if you want to convert a list to a string without commas instead of printing it.

Here’s an example:

Code:

my_list = [1, 2, 3] s = '[' + ' '.join(str(x) for x in my_list) + ']' print(s) # Output: [ 1 2 3 ]

Method 4: Print NumPy Array

Sometimes it is sufficient to use the NumPy default output that is without separating commas. For example, if you print a list it yields

Code:

[1, 2, 3]

. And if you print an array it yields

Code:

[1 2 3]

. You can easily convert a list to a NumPy arrayusing the

Code:

np.array(lst)

constructor.

Code:

import numpy as np my_list = [1, 2, 3] print(np.array(my_list)) # Output: [1 2 3]

Recommended Tutorial: How to Install NumPy?

Where to Go From Here?

Enough theory. Let’s get some practice!

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Programmer Humor

Code:

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❗ Answer: They read the shampoo bottle instructions:
Lather. Rinse. Repeat.