Sometimes, we don’t use lists as is. Instead, we have to convert them to other types.
Turn A List Into A String.
We can use the ”.join() method which combines all elements into one and returns as a string.
weekdays = ['sun','mon','tue','wed','thu','fri','sat']
listAsString = ' '.join(weekdays)
print(listAsString)
#output: sun mon tue wed thu fri sat
Turn A List Into A Tuple.
Call Python’s tuple() function for converting a list into a tuple.
This function takes the list as its argument.
But remember, we can’t change the list after turning it into a tuple because it becomes immutable.
weekdays = ['sun','mon','tue','wed','thu','fri','sat']
listAsTuple = tuple(weekdays)
print(listAsTuple)
#output: ('sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat')
Turn A List Into A Set.
Converting a list to a set poses two side-effects.
Set doesn’t allow duplicate entries so that the conversion will remove any such item.
A set is an ordered collection, so the order of list items would also change.
However, we can use the set() function to convert a list into a Set.
weekdays = ['sun','mon','tue','wed','thu','fri','sat','sun','tue']
listAsSet = set(weekdays)
print(listAsSet)
#output: set(['wed', 'sun', 'thu', 'tue', 'mon', 'fri', 'sat'])
Turn A List Into A Dictionary.
In a dictionary, each item represents a key-value pair. So converting a list isn’t as straightforward as it were for other data types.
However, we can achieve the conversion by breaking the list into a set of pairs and then call the zip() function to return them as tuples.
Passing the tuples into the dict() function would finally turn them into a dictionary.
weekdays = ['sun','mon','tue','wed','thu','fri']
listAsDict = dict(zip(weekdays[0::2], weekdays[1::2]))
print(listAsDict)
#output: {'sun': 'mon', 'thu': 'fri', 'tue': 'wed'}
