Python字典中items()函数案例详解

>>> help(dict.items)
Help on method_descriptor:

items(...)
    D.items() -> list of D's (key, value) pairs, as 2-tuples

>>> help(dict.iteritems)
Help on method_descriptor:

iteritems(...)
    D.iteritems() -> an iterator over the (key, value) items of D

>>> help(dict.viewitems)
Help on method_descriptor:

viewitems(...)
    D.viewitems() -> a set-like object providing a view on D's items

>>> d={1:'one',2:'two',3:'three'}
>>> type(d.items())
<type 'list'>
>>> type(d.iteritems())
<type 'dictionary-itemiterator'>
>>> type(d.viewitems())
<type 'dict_items'>

>>> help(dict.items)
Help on method_descriptor:

items(...)
    D.items() -> a set-like object providing a view on D's items

>>> d={1:'one',2:'two',3:'three'}
>>> type(d.items())
<class 'dict_items'>

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }
sum = 0
for key, value in d.items():
    sum = sum + value
    print(key, ':' ,value)
print('平均分为:' ,sum /len(d))