浅谈Python中数据解析
Importos;--Python自带
print(os.getcwd())--获得当前工作目录
os.chdir('/Users/longlong/Documents')--转换到/Users/longlong/Documents目录
os.path.join(parm1,parm2,...)--从一个或多个路径片段中构造一个路径名。
os.path.expanduser()--用来将包含～符号的路径扩展为完整的路径
>>>pathname='/Users/pilgrim/diveintopython3/examples/humansize.py'
>>>os.path.split(pathname) --('/Users/pilgrim/diveintopython3/examples','humansize.py'）罗列目录内容构造绝对路径
>>>importos
>>>print(os.getcwd())
/Users/longlong/Documents
>>>os.chdir("./python/")
>>>os.getcwd()
'/Users/longlong/Documents/python'
>>>print(os.path.realpath('whileloop.py')
)
/Users/longlong/Documents/python/whileloop.py
>>>print(os.path.realpath("whileloop.py"))
/Users/longlong/Documents/python/whileloop.py
>>>
列表解析
>>>[os.path.realpath(f)forfinglob.glob("*.py")]
['/Users/longlong/Documents/python/indices_over_two_objects.py','/Users/longlong/Documents/python/loops_over_indices.py','/Users/longlong/Documents/python/while_loops.py']<br>
>>>[fforfinglob.glob("*.py")ifos.stat(f).st_size>700]
['indices_over_two_objects.py','while_loops.py']
1
字典解析
>>>metadat_dict={f:os.stat(f)forfinglob.glob('*.py')}
>>>type(metadat_dict)
<class'dict'>
>>>list(metadat_dict.keys())
['indices_over_two_objects.py','while_loops.py','loops_over_indices.py']
>>>metadat_dict['indices_over_two_objects.py'].st_size
871
>>>list(metadat_dict.keys())
['indices_over_two_objects.py','while_loops.py','loops_over_indices.py']
>>>a_dict={'a':1,'b':2,'c':3}
>>>{value:keyforkey,valueina_dict.items()}
{1:'a',2:'b',3:'c'}
集合解析
>>>a_set=set(range(10))
>>>a_set
{0,1,2,3,4,5,6,7,8,9}
>>>{x**2forxina_set}
{0,1,64,4,36,9,16,49,81,25}
>>>{xforxina_setifx%2==0}
{0,8,2,4,6}
>>>{2**xforxinrange(10)}
{32,1,2,64,4,128,256,512,8,16}
以上所述就是本文的全部内容了，希望大家能够喜欢。