continuing xml parsing if tag not found in python using minidom
Sample XML Document
<Authors>
<Author>
<LastName>def</LastName>
<age>20</age>
</Author>
<Author>
<ForeName>ghi</ForeName>
<age>22</age>
</Author>
<Author>
<ForeName>mno</ForeName>
<LastName>pqr</LastName>
<age>23</age>
</Author>
</Authors>
Sample output
Author:
FirstName : -
LastName : def
Author:
FirstName : ghi
LastName : -
Author:
FirstName : mno
LastName : pqr
Sample Code
import xml.dom.minidom
# use the parse() function to load and parse an XML file
doc = xml.dom.minidom.parse("sampleinput.xml");
auth = doc.getElementsByTagName('Author')
for a in auth:
print("Author:")
try:
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
except:
print("FirstName : - ")
try:
print("LastName : ",a.getElementsByTagName("LastName")[0].firstChild.data)
except:
print("LastName : - ")
i want to insert an '-' symbol if corresponding tag is not found. is there any other reliable way to do that rather than try and except?
python
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
add a comment |
Sample XML Document
<Authors>
<Author>
<LastName>def</LastName>
<age>20</age>
</Author>
<Author>
<ForeName>ghi</ForeName>
<age>22</age>
</Author>
<Author>
<ForeName>mno</ForeName>
<LastName>pqr</LastName>
<age>23</age>
</Author>
</Authors>
Sample output
Author:
FirstName : -
LastName : def
Author:
FirstName : ghi
LastName : -
Author:
FirstName : mno
LastName : pqr
Sample Code
import xml.dom.minidom
# use the parse() function to load and parse an XML file
doc = xml.dom.minidom.parse("sampleinput.xml");
auth = doc.getElementsByTagName('Author')
for a in auth:
print("Author:")
try:
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
except:
print("FirstName : - ")
try:
print("LastName : ",a.getElementsByTagName("LastName")[0].firstChild.data)
except:
print("LastName : - ")
i want to insert an '-' symbol if corresponding tag is not found. is there any other reliable way to do that rather than try and except?
python
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
add a comment |
Sample XML Document
<Authors>
<Author>
<LastName>def</LastName>
<age>20</age>
</Author>
<Author>
<ForeName>ghi</ForeName>
<age>22</age>
</Author>
<Author>
<ForeName>mno</ForeName>
<LastName>pqr</LastName>
<age>23</age>
</Author>
</Authors>
Sample output
Author:
FirstName : -
LastName : def
Author:
FirstName : ghi
LastName : -
Author:
FirstName : mno
LastName : pqr
Sample Code
import xml.dom.minidom
# use the parse() function to load and parse an XML file
doc = xml.dom.minidom.parse("sampleinput.xml");
auth = doc.getElementsByTagName('Author')
for a in auth:
print("Author:")
try:
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
except:
print("FirstName : - ")
try:
print("LastName : ",a.getElementsByTagName("LastName")[0].firstChild.data)
except:
print("LastName : - ")
i want to insert an '-' symbol if corresponding tag is not found. is there any other reliable way to do that rather than try and except?
python
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
Sample XML Document
<Authors>
<Author>
<LastName>def</LastName>
<age>20</age>
</Author>
<Author>
<ForeName>ghi</ForeName>
<age>22</age>
</Author>
<Author>
<ForeName>mno</ForeName>
<LastName>pqr</LastName>
<age>23</age>
</Author>
</Authors>
Sample output
Author:
FirstName : -
LastName : def
Author:
FirstName : ghi
LastName : -
Author:
FirstName : mno
LastName : pqr
Sample Code
import xml.dom.minidom
# use the parse() function to load and parse an XML file
doc = xml.dom.minidom.parse("sampleinput.xml");
auth = doc.getElementsByTagName('Author')
for a in auth:
print("Author:")
try:
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
except:
print("FirstName : - ")
try:
print("LastName : ",a.getElementsByTagName("LastName")[0].firstChild.data)
except:
print("LastName : - ")
i want to insert an '-' symbol if corresponding tag is not found. is there any other reliable way to do that rather than try and except?
python
python
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
asked Nov 22 '18 at 5:04
vinay nischalvinay nischal
65
65
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
There is! So lets see what happens when you actually run a.getElementsByTagName if it does not contain your target element.
for a in auth:
print(a.getElementsByTagName("ForeName"))
>>
[<DOM Element: ForeName at 0x163a17226d0>]
[<DOM Element: ForeName at 0x163a1722898>]
Right, now we know that if you try to get an element it does not have, it returns an empty list and is also aligned to the documentation:
A NodeList represents a sequence of nodes. These objects are used in
two ways in the DOM Core recommendation: an Element object provides
one as its list of child nodes, and the getElementsByTagName() and
getElementsByTagNameNS() methods of Node return objects with this
interface to represent query results.
Now instead of doing the try and except loop, you can explicitly check if the element is present before printing your data with:
for a in auth:
if a.getElementsByTagName("ForeName"):
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
else:
print("FirstName : - ")
>>
FirstName : -
FirstName : ghi
FirstName : mno
Here the if block checks to see if it is not empty and followed by a print. Ff the NodeList is empty, it prints the dash.
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
There is! So lets see what happens when you actually run a.getElementsByTagName if it does not contain your target element.
for a in auth:
print(a.getElementsByTagName("ForeName"))
>>
[<DOM Element: ForeName at 0x163a17226d0>]
[<DOM Element: ForeName at 0x163a1722898>]
Right, now we know that if you try to get an element it does not have, it returns an empty list and is also aligned to the documentation:
A NodeList represents a sequence of nodes. These objects are used in
two ways in the DOM Core recommendation: an Element object provides
one as its list of child nodes, and the getElementsByTagName() and
getElementsByTagNameNS() methods of Node return objects with this
interface to represent query results.
Now instead of doing the try and except loop, you can explicitly check if the element is present before printing your data with:
for a in auth:
if a.getElementsByTagName("ForeName"):
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
else:
print("FirstName : - ")
>>
FirstName : -
FirstName : ghi
FirstName : mno
Here the if block checks to see if it is not empty and followed by a print. Ff the NodeList is empty, it prints the dash.
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
add a comment |
There is! So lets see what happens when you actually run a.getElementsByTagName if it does not contain your target element.
for a in auth:
print(a.getElementsByTagName("ForeName"))
>>
[<DOM Element: ForeName at 0x163a17226d0>]
[<DOM Element: ForeName at 0x163a1722898>]
Right, now we know that if you try to get an element it does not have, it returns an empty list and is also aligned to the documentation:
A NodeList represents a sequence of nodes. These objects are used in
two ways in the DOM Core recommendation: an Element object provides
one as its list of child nodes, and the getElementsByTagName() and
getElementsByTagNameNS() methods of Node return objects with this
interface to represent query results.
Now instead of doing the try and except loop, you can explicitly check if the element is present before printing your data with:
for a in auth:
if a.getElementsByTagName("ForeName"):
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
else:
print("FirstName : - ")
>>
FirstName : -
FirstName : ghi
FirstName : mno
Here the if block checks to see if it is not empty and followed by a print. Ff the NodeList is empty, it prints the dash.
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
add a comment |
There is! So lets see what happens when you actually run a.getElementsByTagName if it does not contain your target element.
for a in auth:
print(a.getElementsByTagName("ForeName"))
>>
[<DOM Element: ForeName at 0x163a17226d0>]
[<DOM Element: ForeName at 0x163a1722898>]
Right, now we know that if you try to get an element it does not have, it returns an empty list and is also aligned to the documentation:
A NodeList represents a sequence of nodes. These objects are used in
two ways in the DOM Core recommendation: an Element object provides
one as its list of child nodes, and the getElementsByTagName() and
getElementsByTagNameNS() methods of Node return objects with this
interface to represent query results.
Now instead of doing the try and except loop, you can explicitly check if the element is present before printing your data with:
for a in auth:
if a.getElementsByTagName("ForeName"):
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
else:
print("FirstName : - ")
>>
FirstName : -
FirstName : ghi
FirstName : mno
Here the if block checks to see if it is not empty and followed by a print. Ff the NodeList is empty, it prints the dash.
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
There is! So lets see what happens when you actually run a.getElementsByTagName if it does not contain your target element.
for a in auth:
print(a.getElementsByTagName("ForeName"))
>>
[<DOM Element: ForeName at 0x163a17226d0>]
[<DOM Element: ForeName at 0x163a1722898>]
Right, now we know that if you try to get an element it does not have, it returns an empty list and is also aligned to the documentation:
A NodeList represents a sequence of nodes. These objects are used in
two ways in the DOM Core recommendation: an Element object provides
one as its list of child nodes, and the getElementsByTagName() and
getElementsByTagNameNS() methods of Node return objects with this
interface to represent query results.
Now instead of doing the try and except loop, you can explicitly check if the element is present before printing your data with:
for a in auth:
if a.getElementsByTagName("ForeName"):
print("FirstName : ",a.getElementsByTagName("ForeName")[0].firstChild.data)
else:
print("FirstName : - ")
>>
FirstName : -
FirstName : ghi
FirstName : mno
Here the if block checks to see if it is not empty and followed by a print. Ff the NodeList is empty, it prints the dash.
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
answered Nov 22 '18 at 5:53
BernardLBernardL
2,3381929
2,3381929
add a comment |
add a comment |
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