If no positional argument is given, an empty dictionary is created.
If a positional argument is given and it is a mapping object, a dictionary
is created with the same key-value pairs as the mapping object. Otherwise,
- the positional argument must be an :term:`iterator` object. Each item in
- the iterable must itself be an iterator with exactly two objects. The
+ the positional argument must be an :term:`iterable` object. Each item in
+ the iterable must itself be an iterable with exactly two objects. The
first object of each item becomes a key in the new dictionary, and the
second object the corresponding value. If a key occurs more than once, the
last value for that key becomes the corresponding value in the new