says

"operator.add ... Return a + b, for a and b numbers "

and

"operator.mul... Return a * b, for a and b numbers"

but both of those also work on strings [0] (and perhaps other types):

>>> import operator
>>> operator.add('s', 't')
'st'
>>> operator.mul('a', 3)
'aaa'
>>> operator.mul(3, 'b')

'bbb'

[0] "Strings can be concatenated (glued together) with the + operator, and repeated with *"

>>> 3 * 'un' + 'ium'
'unununium'