Performs a Mail Merge on Office Open XML (docx) files. Can be used on any system without having to install Microsoft Office Word. Supports Python 2.7, 3.3 and up.
Installation with pip:
$ pip install docx-mailmerge2
Open the file.
from mailmerge import MailMerge
with MailMerge('input.docx',
remove_empty_tables=False,
auto_update_fields_on_open="no",
keep_fields="none") as document:
...
List all merge fields.
print(document.get_merge_fields())
Merge fields, supplied as kwargs.
document.merge(field1='docx Mail Merge',
field2='Can be used for merging docx documents')
Merge table rows. In your template, add a MergeField to the row you would like
to designate as template. Supply the name of this MergeField as anchor
parameter. The second parameter contains the rows with key-value pairs for
the MergeField replacements.
If the tables are empty and you want them removed, set remove_empty_tables=True in constructor.
document.merge_rows('col1',
[{'col1': 'Row 1, Column 1', 'col2': 'Row 1 Column 1'},
{'col1': 'Row 2, Column 1', 'col2': 'Row 2 Column 1'},
{'col1': 'Row 3, Column 1', 'col2': 'Row 3 Column 1'}])
Starting in version 0.2.0 you can also combine these two separate calls into a single call to merge.
document.merge(field1='docx Mail Merge',
col1=[
{'col1': 'A'},
{'col1': 'B'},
])
Starting in version 0.2.0 there's also the feature for template merging. This creates a copy of the template for each item in the list, does a merge, and separates them by page or section breaks (see function documentation). Starting in version 0.8.0 you can also use fields in the headers/footers/footnotes with the merge_templates method.
document.merge_templates([
{'field1': "Foo", 'field2: "Copy #1"},
{'field1': "Bar", 'field2: "Copy #2"},
], separator='page_break')
Starting in version 0.6.0 the fields formatting is respected when compatible. Numeric, Text, Conditional and Date fields (0.6.2) are implemented. For Date fields a compatible datetime, date or time objects must be provided. If locale support is needed, make sure to call the setlocale before merging
import locale
locale.setlocale(locale.LC_TIME, '') # for system locale
document.merge_templates([
{'datefield': datetime.date('2022-04-15')},
], separator='page_break')
The {NEXT} fields are supported (0.6.3).
You can also use the merge fields inside other fields, for example to insert pictures in the docx {INCLUDEPICTURE} or for conditional texts {IF}. Microsoft Word is needed to update the values of those fields.
{ INCLUDEPICTURE "{ MERGEFIELD path }/{ MERGEFIELD image }" }
{ IF "{ MERGEFIELD reason }" <> "" "Reason: { MERGEFIELD reason }" }
Always enclose the fields with double quotes, as the MERGE fields will be first filled in with data and then the other fields will be computed through Word.
If the fields are nested inside other fields, the outer fields need to be updated in Word. This can be done by selecting everything (CTRL-a) and then update the fields (F9). There is a way to force the Word to update fields automatically when opening the document. docx-mailmerge can set this setting when saving the document. You can configure this feature by using the auto_update_fields_on_open parameter. The value always will set the setting regardless if needed or not and the value auto will only set it when necessary (when nested fields exist). The default value no will not activate this setting.
Write document to file. This should be a new file, as ZipFile cannot modify
existing zip files.
document.write('output.docx')
By default, all MERGEFIELD fields are replaced with their value. If a value is not given, it is replaced with an empty string. If you want to keep the existing MERGEFIELD fields (with their current value) you can specify the keep_fields="some" parameter in the constructor.
from mailmerge import MailMerge
with MailMerge('keep_unchanged_fields.docx',
keep_fields="some") as document:
...
If you want to only update the value of the MERGEFIELD fields but keep the fields themselves, you can specify the keep_fields="all" parameter in the constructor. This way, you can change the document and update the fields again later.
from mailmerge import MailMerge
with MailMerge('keep_all_fields.docx',
keep_fields="all") as document:
...
See also the unit tests and this nice write-up Populating MS Word Templates with Python on Practical Business Python for more information and examples.
To include dynamic images in a docx template document you can use the { INCLUDEPICTURE "...." } field. For the path you can use MERGEFIELD dynamic fields. See example above.
The problem is to actually include the images in the word document after the mailmerge. This can be done by opening the merged docx in Microsoft Word, selecting all the text and pressing the F9 to update all fields. Unfortunately this method needs Microsoft Word installed and it is known to cause a lot of problems.
Another solution would be to use the docx-mergefields package to replace the INCLUDEPICTURE fields with the actual image. This method also works with images loaded from a database in base64 data-uri format, as well as URLs and local images.
See the documentation of docx-mergefields for examples.
- Implement SKIPIF and NEXTIF fields
- Fork the repository on GitHub and start hacking
- Create / fix the unit tests
- Send a pull request with your changes
In order to make sure that the library performs the way it was designed, unit tests are used. When providing new features, or fixing bugs, there should be a unit test that demonstrates it. Run the test suite:
python -m unittest discover