Python Reportlab PDF - Centering Text on page

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I am using ReportLab to generate a pdf dynamically with python.

I would like a line of text to be centered on a page. Here is the specific code I currently have, but do not know how to center the text horizontally. 

header = p.beginText(190, 740)
header.textOut("Title of Page Here")

# I know i can use TextLine etc in place of textOut

p.drawText(header)

The text displays and I can manually move the left position so the text looks centered, but I need this to be centered programmatically since the text will be dynamic and I don't know how much text there will be.

reportlab pdf-generation python
5 Answers

You can use Flowable object like Paragraph and assign alignment value to 1:

styles = getSampleStyleSheet()
title_style = styles['Heading1']
title_style.alignment = 1
title = Paragraph("Hello Reportlab", title_style)
story.append(title)

This example will create a pdf document with centered text:

from flask import make_response
import io
from reportlab.platypus import SimpleDocTemplate, Paragraph
from reportlab.lib.styles import getSampleStyleSheet

story=[]
pdf_doc = io.BytesIO()
doc = SimpleDocTemplate(pdf_doc)

styles = getSampleStyleSheet()
title_style = styles['Heading1']
title_style.alignment = 1
title = Paragraph("Hello Reportlab", title_style)
story.append(title)
doc.build(story)

content = pdf_doc.getvalue()

#output to browser
response = make_response(content)
response.mimetype = 'application/pdf'
return response

If you want the text to be floaten to the left, you need to change alignment to 0:

title_style.alignment = 0

If you want the text to be floaten to the right, you need to change alignment to 2:

title_style.alignment = 2
user_98373290 
from reportlab.lib.pagesizes import letter
from reportlab.platypus import SimpleDocTemplate, Paragraph
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
doc = SimpleDocTemplate("form_letter.pdf",pagesize=letter,
                        rightMargin=72,leftMargin=72,
                        topMargin=72,bottomMargin=18)
Story = []
styles = getSampleStyleSheet()
title_style = styles['Heading1']
title_style.alignment = 1
title = Paragraph("Welcome to india", title_style)
Story.append(title)
doc.build(Story)
user_61554640
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