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To automatically resize a QLineEdit to fit its content, you can use the following code:
# Get the width of the text in the QLineEdit
text_width = my_qlineedit.fontMetrics().boundingRect(my_qlineedit.text()).width()
# Set the minimum width of the QLineEdit to the width of the text
my_qlineedit.setMinimumWidth(text_width)
This code gets the width of the text in the QLineEdit using the QFontMetrics.boundingRect() method, then sets the minimum width of the QLineEdit to that width. The QLineEdit will automatically resize itself to fit its content as the user types or deletes text.