Problem on using lxml with tostring and pretty_print

Question

I have read some of the answers for related questions, but none of them is directly related with lxml tostring and pretty_print.

I am using lxml and trying to create a xml file on Python 3.6.

The problem I found is that elements are not wrapped and ordered by parent element and believe it is related with the "pretty_print" option.

What I need to achieve is:

<root>
    <element1></element1>
    <element2></element2>
    <child1></child1>
    <child2></child2>
</root>

The result I get is:

<root><element1></element1><element2></element2><child1></child1><child2></child2></root>

Part of the code I am using:

from lxml import etree as et

CompanyID = "Company Identification"
TaxRegistrationNumber = "Company Reg. Number"
TaxAccountingBasis = "File Tipe"                   
CompanyName = "Company Name"
BusinessName = "Business Name"

root = et.Element("root")
header = et.SubElement(root, 'Header')
header.tail = '\n'

data = (
       ('CompanyID', str(CompanyID)),
       ('TaxRegistrationNumber', str(TaxRegistrationNumber)),
       ('TaxAccountingBasis', str(TaxAccountingBasis)),
       ('CompanyName', str(CompanyName)),
       ('BusinessName', str(BusinessName)),
     )

for tag, value in data:
    if value is None :
        continue
    et.SubElement(header, tag).text=value

xml_txt = et.tostring(root, pretty_print=True, encoding="UTF-8")
print(xml_txt)

If I print the elements with no data into it, it works fine and the "pretty_print" works fine.

If I add data to each of the elements (using the above variables), the "pretty_print" does not work and the structure gets messed up.

What could be wrong?

Answer 1

I found it.

I have removed the "header.tail = '\n'" from the code and it's working now.

root = et.Element("root")
header = et.SubElement(root, 'Header')
#header.tail = '\n'

Thank you all