How to setup the QPlainText line-height in Python

I encountered a problem while using Pyton's QPlaintExt component: How do I set the line height of QPlainText? I've tried multiple approaches: Method 1: Using QTextDocument with HTML (Guaranteed to Work)

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit, QVBoxLayout, QWidget
from PyQt5.QtCore import Qt

class TextEditor(QMainWindow): 
def __init__(self): 
super().__init__() 
self.initUI() 

def initUI(self): 
self.setWindowTitle('Working Line Height - HTML Method') 
self.setGeometry(100, 100, 600, 400) 

central_widget = QWidget() 
self.setCentralWidget(central_widget) 
layout = QVBoxLayout(central_widget) 

# Use QTextEdit instead of QPlainTextEdit 
self.text_edit = QTextEdit() self.text_edit.setAcceptRichText(True) 
layout.addWidget(self.text_edit) 

# Set line height using HTML/CSS 
self.set_text_with_line_height() 

def set_text_with_line_height(self): 
"""Set text with line height using HTML/CSS""" 
html_content = """ 
<style> 
p { 
line-height: 2.0; /* Double spacing */ 
margin: 0; 
padding: 0; 
} 
</style> 
<p>Line 1 with double spacing</p> 
<p>Line 2 with double spacing</p> 
<p>Line 3 with double spacing</p> 
<p>Line 4 with double spacing</p> 
""" 

self.text_edit.setHtml(html_content)

if __name__ == '__main__': 
app = QApplication(sys.argv) 
editor= TextEditor() 
editor.show() 
sys.exit(app.exec_())

Method 2: Custom QPlainTextEdit with Painter (Advanced but Works)

importsys
from PyQt5.QtWidgets import QApplication, QMainWindow, QPlainTextEdit, QVBoxLayout, QWidget
from PyQt5.QtGui import QTextFormat, QPainter, QFontMetrics
from PyQt5.QtCore import Qt, QRect

class CustomPlainTextEdit(QPlainTextEdit): 
def __init__(self, line_height_factor=1.5): 
super().__init__() 
self.line_height_factor = line_height_factor 

def paintEvent(self, event): 
# Create a custom painter 
painter = QPainter(self.viewport()) 

#Get the document and block 
doc = self.document() 
block = doc.firstBlock() 

# Get font metrics 
font_metrics = QFontMetrics(self.font()) 
line_spacing = font_metrics.lineSpacing() * self.line_height_factor 

#Calculate visible area 
content_offset_y = self.contentOffset().y() 
viewport_rect = self.viewport().rect() 

painter.setFont(self.font()) 
painter.setPen(self.palette().text().color()) 

# Iterate through blocks 
while block.isValid(): 
layout = block.layout() 
if not layout: 
block = block.next() 
continue 

# Get block position 
position = doc.findBlock(block.position()).position() 
block_rect = self.blockBoundingGeometry(block).translated(self.contentOffset()).toRect() 

# Only draw visible blocks 
if block_rect.bottom() < viewport_rect.top(): 
block = block.next() 
continue 
if block_rect.top() > viewport_rect.bottom(): 
break 

# Draw text with custom line height 
lines = block.text().split('\n') 
y = block_rect.top() 

for line in lines: 
if y > viewport_rect.bottom(): 
break 
if y + line_spacing >= viewport_rect.top(): 
painter.drawText(QRect(0, y, viewport_rect.width(), line_spacing), 
Qt.AlignLeft | Qt.AlignTop, line) 
y += line_spacing 

block = block.next() 

painter.end()

class TextEditor(QMainWindow): 
def __init__(self): 
super().__init__() 
self.initUI() 

def initUI(self): 
self.setWindowTitle('Custom QPlainTextEdit with Line Height') self.setGeometry(100, 100, 600, 400) 

central_widget = QWidget() 
self.setCentralWidget(central_widget) 
layout = QVBoxLayout(central_widget) 

# Use our custom QPlainTextEdit 
self.text_edit = CustomPlainTextEdit(line_height_factor=2.0) # Double spacing 
layout.addWidget(self.text_edit) 

# Set text 
self.text_edit.setPlainText("Line 1\nLine 2\nLine 3\nLine 4\nLine 5")

if __name__ == '__main__': 
app = QApplication(sys.argv) 
editor = TextEditor() 
editor.show() 
sys.exit(app.exec_())

Method 3: Simple Workaround - Use QTextEdit in Plain Text Mode ... Code omitted...

None of the methods work(from 1 to 3).