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Generate barcodes by using Python(批量生成条形码)

Posted on Edited on In , Disqus:

Share a script I used today to generate batch of barcodes by using Python.

  1. generate the range of barcode you want.
  2. use label to generate an image.
  3. fill the image generated in step 2 into a PDF and save it.
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#!/usr/bin/env python3
from itertools import product

from typing import List
from reportlab.lib.pagesizes import A4
from reportlab.graphics.shapes import Drawing, String
from reportlab.graphics.barcode.eanbc import Ean13BarcodeWidget
from reportlab.graphics import renderPDF
from reportlab.pdfgen.canvas import Canvas

PAGESIZE = A4  # choose the final print page size
NUM_LABELS_X = 3    # how many barcodes per line
NUM_LABELS_Y = 5    # how many barcodes per column
BAR_WIDTH = 1.5     # barcode length
BAR_HEIGHT = 51.0   # barcode height
TEXT_Y = 80
BARCODE_Y = 17

LABEL_WIDTH = PAGESIZE[0] / NUM_LABELS_X
LABEL_HEIGHT = PAGESIZE[1] / NUM_LABELS_Y
SHEET_TOP = PAGESIZE[1]

def codes(number):
    """ Generate all the possible barcodes
    params
    number: the range number of each position
    """
    for barcode in product(range(10), repeat = number):
        yield "".join(map(str, barcode))

def label(ean13: str, description: str) -> Drawing:
    """
    Generate a drawing with EAN-13 barcode and descriptive text.
    :param ean13: The EAN-13 Code.
    :type ean13: str
    :param description: Short product description.
    :type description: str
    :return: Drawing with barcode and description
    :rtype: Drawing
    """
    print(ean13)
    text = String(0, TEXT_Y, description, fontName="Helvetica",
                  fontSize=10, textAnchor="middle")
    text.x = LABEL_WIDTH / 2  # center text (anchor is in the middle)

    barcode = Ean13BarcodeWidget(ean13)
    barcode.barWidth = BAR_WIDTH
    barcode.barHeight = BAR_HEIGHT
    x0, y0, bw, bh = barcode.getBounds()
    barcode.x = (LABEL_WIDTH - bw) / 2  # center barcode
    barcode.y = BARCODE_Y  # spacing from label bottom (pt)
    label_drawing = Drawing(LABEL_WIDTH, LABEL_HEIGHT)
    label_drawing.add(text)
    label_drawing.add(barcode)
    return label_drawing

def fill_sheet(canvas: Canvas, label_drawings: List[Drawing]):
    """
    Simply fill the given ReportLab canvas with label drawings.
    :param canvas: The ReportLab canvas
    :type canvas: Canvas
    :param label_drawing: Contains Drawing of configured size
    :type label_drawing: Drawing
    """
    index = 0
    for u in range(0, NUM_LABELS_Y):
        for i in range(0, NUM_LABELS_X):
            x = i * LABEL_WIDTH
            y = SHEET_TOP - LABEL_HEIGHT - u * LABEL_HEIGHT
            if index >= len(label_drawings):
                break
            renderPDF.draw(label_drawings[index], canvas, x, y)
            index += 1

if __name__ == '__main__':
    raw_codes = [code for code in codes(3)]
    labels = [label("490177241" + code, '') for code in raw_codes[:200]]
    total = NUM_LABELS_X * NUM_LABELS_Y
    page = 1
    while labels:
        canvas = Canvas("{}.pdf".format(page), pagesize=PAGESIZE)
        page += 1
        fill_sheet(canvas, labels[:min(total, len(labels))])
        canvas.save()
        labels = labels[min(total, len(labels)):]