[Tut] The Most Pythonic Way to Convert a List of Tuples to a String

[xSicKxBot]

The Most Pythonic Way to Convert a List of Tuples to a String



The most Pythonic way to convert a list of tuples to a string is to use the built-in method

Code:

str(...)

. If you want to customize the delimiter string, the most Pythonic way is to concatenate the

Code:

join()

method and the

Code:

map()

function

Code:

'\n'.join(map(str, lst))

to convert all tuples to strings and gluing those together with the new-line delimiter

Code:

'\n'

.



Exercise: Run the interactive code snippet. Which method do you like most?

https://trinket.io/embed/python/ad8db38a29

Method 1: Default String Conversion

Say, you’ve got a list of tuples, and you want to convert it to a string (e.g., see thisSO post). The easiest way to accomplish this is to use the default string conversion method

Code:

str(...)

.

Code:

>>> lst = [(1,1), (2,1), (4,2)] >>> str(lst) '[(1, 1), (2, 1), (4, 2)]'

The result is a nicely formatted string representation of your list of tuples.

Method 2: Join() and Map()

However, if you want to customize the delimiterstring, you can use the

Code:

join()

method in combination with the

Code:

map()

function:

Code:

lst = [(1,1), (2,1), (4,2)] print('--'.join(map(str, lst))) # (1, 1)--(2, 1)--(4, 2)

The

Code:

map()

function transforms each tuple into a string value, and the

Code:

join()

method transforms the collectionof strings to a single string—using the given delimiter

Code:

'--'

. If you forget to transform each tuple into a string with the

Code:

map()

function, you’ll get a

Code:

TypeError

because the

Code:

join()

method expects a collection of strings.

Method 3: Flatten List of Tuples

If you want to flatten the list and integrate all tupleelements into a single large collection of elements, you can use a simple list comprehension statement

Code:

[str(x) for t in lst for x in t]

.

Code:

lst = [(1,1), (2,1), (4,2)] print('\n'.join([str(x) for t in lst for x in t])) ''' 1 1 2 1 4 2 '''

If you want to redefine how to print each tuple—for example, separating all tuple values by a single whitespace character—use the following method based on a combination of the

Code:

join()

method and the

Code:

map()

function with a custom lambda function

Code:

lambda x: str(x[0]) + ' ' + str(x[1])

to be applied to each list element.

Code:

lst = [(1,1), (2,1), (4,2)] print('\n'.join(map(lambda x: str(x[0]) + ' ' + str(x[1]), lst))) ''' 1 1 2 1 4 2 '''

Where to Go From Here?

Enough theory, let’s get some practice!

To become successful in coding, you need to get out there and solve real problems for real people. That’s how you can become a six-figure earner easily. And that’s how you polish the skills you really need in practice. After all, what’s the use of learning theory that nobody ever needs?

Practice projects is how you sharpen your saw in coding!

Do you want to become a code master by focusing on practical code projects that actually earn you money and solve problems for people?

Then become a Python freelance developer! It’s the best way of approaching the task of improving your Python skills—even if you are a complete beginner.

Join my free webinar “How to Build Your High-Income Skill Python” and watch how I grew my coding business online and how you can, too—from the comfort of your own home.

Join the free webinar now!