basestring:
Type basestring cannot be instantiated; it is the base for str and
unicode.
str:
str(object) -> string
dict:
dict() -> new empty dictionary
dict(mapping) -> new dictionary initialized from a mapping object's
(key, value) pairs
dict(iterable) -> new dictionary initialized as if via:
d = {}
for k, v in iterable:
d[k] = v
dict(**kwargs) -> new dictionary initialized with the name=value pairs
in the keyword argument list.
list:
list() -> new empty list list(iterable) -> new list
initialized from iterable's items