Python pydicom中的ds.get（）和ds.get_item（）之间有什么区别
有人知道FileDataset.get和FileDataset.get两种方法在Pydicom中的区别吗？Python pydicom中的ds.get（）和ds.get_item（）之间有什么区别,python,pydicom,Python,Pydicom,有人知道FileDataset.get和FileDataset.get两种方法在Pydicom中的区别吗？ 谢谢 我想你的答案就在这两个函数的源代码中。看起来像是将字符串和数据元素作为输入进行处理 def get(self, key, default=None): """Extend dict.get() to handle DICOM DataElement keywords. Parameters ---------- key
谢谢 我想你的答案就在这两个函数的源代码中。看起来像是将字符串和数据元素作为输入进行处理
def get(self, key, default=None):
"""Extend dict.get() to handle DICOM DataElement keywords.
Parameters
----------
key : str or pydicom.tag.Tag
The element keyword or Tag or the class attribute name to get.
default : obj or None
If the DataElement or class attribute is not present, return
`default` (default None).
Returns
-------
value
If `key` is the keyword for a DataElement in the Dataset then
return the DataElement's value.
pydicom.dataelem.DataElement
If `key` is a tag for a DataElement in the Dataset then return the
DataElement instance.
value
If `key` is a class attribute then return its value.
"""
if isinstance(key, (str, compat.text_type)):
try:
return getattr(self, key)
except AttributeError:
return default
else:
# is not a string, try to make it into a tag and then hand it
# off to the underlying dict
if not isinstance(key, BaseTag):
try:
key = Tag(key)
except Exception:
raise TypeError("Dataset.get key must be a string or tag")
try:
return_val = self.__getitem__(key)
except KeyError:
return_val = default
return return_val
def get_item(self, key):
"""Return the raw data element if possible.
It will be raw if the user has never accessed the value, or set their
own value. Note if the data element is a deferred-read element,
then it is read and converted before being returned.
Parameters
----------
key
The DICOM (group, element) tag in any form accepted by
pydicom.tag.Tag such as [0x0010, 0x0010], (0x10, 0x10), 0x00100010,
etc. May also be a slice made up of DICOM tags.
Returns
-------
pydicom.dataelem.DataElement
"""
if isinstance(key, slice):
return self._dataset_slice(key)
if isinstance(key, BaseTag):
tag = key
else:
tag = Tag(key)
data_elem = dict.__getitem__(self, tag)
# If a deferred read, return using __getitem__ to read and convert it
if isinstance(data_elem, tuple) and data_elem.value is None:
return self[key]
return data_elem
我想你的答案在这两个函数的源代码中。看起来像是将字符串和数据元素作为输入进行处理
def get(self, key, default=None):
"""Extend dict.get() to handle DICOM DataElement keywords.
Parameters
----------
key : str or pydicom.tag.Tag
The element keyword or Tag or the class attribute name to get.
default : obj or None
If the DataElement or class attribute is not present, return
`default` (default None).
Returns
-------
value
If `key` is the keyword for a DataElement in the Dataset then
return the DataElement's value.
pydicom.dataelem.DataElement
If `key` is a tag for a DataElement in the Dataset then return the
DataElement instance.
value
If `key` is a class attribute then return its value.
"""
if isinstance(key, (str, compat.text_type)):
try:
return getattr(self, key)
except AttributeError:
return default
else:
# is not a string, try to make it into a tag and then hand it
# off to the underlying dict
if not isinstance(key, BaseTag):
try:
key = Tag(key)
except Exception:
raise TypeError("Dataset.get key must be a string or tag")
try:
return_val = self.__getitem__(key)
except KeyError:
return_val = default
return return_val
def get_item(self, key):
"""Return the raw data element if possible.
It will be raw if the user has never accessed the value, or set their
own value. Note if the data element is a deferred-read element,
then it is read and converted before being returned.
Parameters
----------
key
The DICOM (group, element) tag in any form accepted by
pydicom.tag.Tag such as [0x0010, 0x0010], (0x10, 0x10), 0x00100010,
etc. May also be a slice made up of DICOM tags.
Returns
-------
pydicom.dataelem.DataElement
"""
if isinstance(key, slice):
return self._dataset_slice(key)
if isinstance(key, BaseTag):
tag = key
else:
tag = Tag(key)
data_elem = dict.__getitem__(self, tag)
# If a deferred read, return using __getitem__ to read and convert it
if isinstance(data_elem, tuple) and data_elem.value is None:
return self[key]
return data_elem
这两种方法在用户代码中并不经常使用。Dataset.get是python的等价物；它允许您请求字典中的项，但如果数据集中不存在该项，则返回默认值。从数据集中获取项目的更常用方法是使用点表示法，例如
dataset.PatientName
dataset[0x100010]
与关键字一起使用时，Dataset.get返回值，而不是DataElement实例。Dataset.get_项始终返回DataElement实例或RawDataElement实例。这两种情况在用户代码中不常用。Dataset.get是python的等价物；它允许您请求字典中的项，但如果数据集中不存在该项，则返回默认值。从数据集中获取项目的更常用方法是使用点表示法，例如
dataset.PatientName
dataset[0x100010]