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What is join use for in python

What is join use for in python

>>> sentence = ['this','is','a','sentence']
>>> '-'.join(sentence)
'this-is-a-sentence'

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Source: stackoverflow.com

Join() python

# example of join() function in python

numList = ['1', '2', '3', '4']
separator = ', '
print(separator.join(numList))

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