# Python Print One Line List

## Problem Formulation

Given a list such as a list of integers. How to print the list elements in one line?

```Input:
[1, 2, 3, 4, 5]

Output:
1 2 3 4 5```

## Method 1: Print One Line List With Asterisk

To print all list of elements in one line, unpack the list into the built-in `print()` function. In particular, you use the asterisk operator as a prefix in front of the list to unpack all elements into the argument list of the `print()` function. For example, to print the list `[1, 2, 3]` in one line, use `print(*[1, 2, 3])`.

Here’s an example on an integer list:

```>>> print(*[1, 2, 3, 4, 5])
1 2 3 4 5```

Here’s another example with mixed data types:

```>>> print(*['alice', 'bob', 'carl', 42])
alice bob carl 42```

You can watch my explainer video on the asterisk operator here:

## Method 2: Print One Line List Separator

Say, you want to print a list of elements in one line using a specific separator between the elements.

To accomplish this, unpack the list into the built-in `print()` function using the asterisk operator as a prefix in front of the list. This unpacks all elements into the argument list of the `print()` function. Now, add the desired separator argument, e.g., `sep='\t'` to use the tabular character as a separator. For example, to print the list `[1, 2, 3]` in one line, separatred by tab chars, use `print(*[1, 2, 3], sep='\t')`.

Here’s an example on an integer list:

```>>> print(*[1, 2, 3, 4, 5], sep='\t')
1	2	3	4	5```

## Method 3: Simple For Loop with the Print Function’s End Argument

To print a list and display it in a single line, a straightforward solution is to iterate over each element in a for loop and print this element into the same line using the `print()` function with the `end=' '` argument set to the empty space. This prevents the `print()` function to automatically print each element to a new line.

Here’s how this is done for a mixed-type list:

```>>> lst = [1, 2, 3, 4, 5, 'alice', 'bob']
>>> for x in lst:
print(x, end= ' ')

1 2 3 4 5 alice bob ```

You can also use another `end` argument such as the tabular character `'\t'` like so:

```>>> lst = [1, 2, 3, 4, 5, 'alice', 'bob']
>>> for x in lst:
print(x, end= '\t')

1	2	3	4	5	alice	bob```

## Method 4: str.join() on List of Strings

The `' '.join(list)` method concatenates all elements in a given list of strings using the empty space (on which the method is called) as a separator argument.

Here’s how this works out to print a list of strings in a single line by first creating a one-line string using the join method and then printing that string to the shell:

```>>> ' '.join(['the', 'answer', 'is', '42'])

You can master the `join()` method and other string methods here:

## Method 5: str.join() and List Comprehension on General List

The `' '.join(list)` method concatenates all elements in a given list of strings using the empty space (on which the method is called) as a separator argument. To convert each element in the list to a string value first, use the list comprehension statement `[str(x) for x in list]`. You can combine both to `' '.join([str(x) for x in list])` to print all elements in a general list to the standard output in one line.

Here’s how this works:

```>>> ' '.join(str(x) for x in lst)
'42 python 3.3 (1, 2)'```

You can master generator expressions here and list comprehension here:

## Where to Go From Here?

Enough theory, let’s get some practice!

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