ex.32#循环和列表 the_count = [1,2,3,4,5]fruits = [‘apples‘,‘oranges‘,‘pears‘,‘apricots‘]change = [1,‘pennies‘,2,‘dimes‘,3,‘quarters‘] #this first kind of for-loop goes through a list. for number in the_count: print (‘this is count %d‘ %number) #same as abovefor fruit in fruits: print(‘a fruit of type %r‘ %fruit) #also we can go through mixed list too.#notice we have to use %r since we don‘t know what‘s in it. for i in change: print(‘i got %r‘ %i) #we can also built lists,first start with an empty one.elements = [] #then use the range function to do 0 to 5 counts.for i in range (0,6): print(‘adding %d to the list.‘ %i) #append is a function that lists understand. elements.append(i) #now we can print them out too.for i in elements: print(‘elements was %d‘ %i)--------------------------------------------------------------- dir（list）
[‘__add__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__delitem__‘, ‘__dir__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘_
_gt__‘, ‘__hash__‘, ‘__iadd__‘, ‘__imul__‘, ‘__init__‘, ‘__init_subclass__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__mul__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘
, ‘__reduce_ex__‘, ‘__repr__‘, ‘__reversed__‘, ‘__rmul__‘, ‘__setattr__‘, ‘__setitem__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘append‘, ‘clear‘, ‘copy‘, ‘co
unt‘, ‘extend‘, ‘index‘, ‘insert‘, ‘pop‘, ‘remove‘, ‘reverse‘, ‘sort‘]
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dir(range)
[‘__bool__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__dir__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__gt__‘, ‘__has
h__‘, ‘__init__‘, ‘__init_subclass__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__reversed__‘, ‘_
_setattr__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘count‘, ‘index‘, ‘start‘, ‘step‘, ‘stop‘]
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