Tuple of one element in Python

A tuple can consist of only one element.

However, when working with such tuples, there is a nuance: after the element, you must put a hanging comma:

pythontpl = ('a',)

If you leave the element without a comma, the brackets will denote mathematical grouping brackets:

pythontest1 = ('a',) # tuple
test2 = ('a')  # string
test3 = (1)    # number

If you create a tuple of several elements, then you don’t need to put a comma after the last one (but you can):

pythontpl = ('a', 'b', 'c')

pythontst = ('1')

pythontst = (1,)

pythontst = (True)