python列表，元组，字典和字符串之间的相互转换

>>> mytuple = (1,2,3)
>>> print list(mytuple)
[1, 2, 3]

>>> mylist = [1,2,3]
>>> print tuple(mylist)
(1, 2, 3)

>>> mylist2 = [('black',0), ('red',3), ('yellow',7)]
>>> print dict(mylist2)
{'black': 0, 'yellow': 7, 'red': 3}

>>> mystr = 'I love you'
>>> print list(mystr)
['I', ' ', 'l', 'o', 'v', 'e', ' ', 'y', 'o', 'u']

>>> mylist3 = ['l','o','ve']
>>> print ''.join(mylist3)
love