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

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

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[Tut] The Most Pythonic Way to Convert a List of Tuples to a String - xSicKxBot - 06-08-2020

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

[Image: convert-1024x576.jpg]

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!

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