如何读取Excel个文件，生成二维码？

Question

我正在尝试使用此代码

from openpyxl import load_workbook
import qrcode

wb = load_workbook("D:\QR\qrcodes.xlsx")  
ws = wb.['Sheet1']  
column = ws['A']  # Column
data = [column[x].value for x in range(len(column))]

print(data)
qr = qrcode.QRCode(version = 1, error_correction = qrcode.constants.ERROR_CORRECT_H,box_size = 10, border = 4)

ext=".png"
for images in data:
    qr.add_data(i)
    qr.make(fit=True)
    img=qr.make_image()
    img.save("{}{}".format(i,ext))

但是每次循环后创建的图像也包含前一个图像的值，如何解决？

Answer 1

首先请转换为csv。然后你应该添加 enumerate 这样你的文件名也会有一个索引号而不是多个 file.jpg.

import csv
import qrcode

with open('D:\QR\qrcodes.csv') as csvfile:
    fieldnames= ["Your_Column"]
    reader= csv.reader(csvfile)

    qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_L,
    box_size=10,
    border=4,
    )
    for i, row in enumerate(reader):
        labeldata = row[0]

        qr.add_data(labeldata)
        qr.make(fit=True)

        img = qr.make_image()
        img.save("test{}.jpg".format(i))

Answer 2

您正在循环外创建 QR 对象。
您最好在 for 循环中初始化对象 and
还使用 函数来创建 QR 图像，因为函数内的变量具有局部作用域。

ext=".png"
def createQr(data):
    qr = qrcode.QRCode(version = 1, error_correction = qrcode.constants.ERROR_CORRECT_H,box_size = 10, border = 4)
    qr.add_data(data)
    qr.make(fit=True)
    img=qr.make_image()
    return img

for i in data:
    img = createQr(i)
    img.save("{}{}".format(i,ext))

同样如 @martineau 所述，您必须将循环变量从 images 更改为 i

Answer 3

从 Excel 文件中，它从第二行开始读取“A”列中的数据并生成其 QR 码，并创建一个名为“qrcode_produced 的新 excel 文件" 在 B 列中生成了 QR 码。

# modules needed
import qrcode
from tkinter import filedialog
from tkinter import *
import openpyxl
from openpyxl import Workbook
from openpyxl.styles import Alignment
from openpyxl import load_workbook

#select the excel file to be read
# the texts must be in the "A" column starting with "2" row. In the B column, qrcodes will be seen.
print('select xlsx file:')
root = Tk()
root.filename =  filedialog.askopenfilename(initialdir = "/",title = "Select file",filetypes = (("xlsx files","*.xlsx"),("all files","*.*")))
print (root.filename)

# select the folder to save qrcodes as png format images and excel file with qrcodes
print('where to save excel file and qrcodes:')
root2 = Tk()
root2.withdraw()
folder_selected = filedialog.askdirectory()

# read the excel file
workbook = load_workbook(str(root.filename))
sheet = workbook.active

# settings for qrcode to be produced
qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_L,
    box_size=4,
    border=2,)

# excel file cell size settings that will be produced 
sheet.column_dimensions['B'].width = 25
for i in range(1,len(sheet['A'])+1):
    sheet.row_dimensions[i+1].height=150

# Title of B column
sheet["B1"]="Qr_Codes"

# production of qrcodes for each row in the A column except first row. Skips the empty rows.
for i in range(2,len(sheet['A'])+1):
  if sheet.cell(row=i, column=1).value is None:
    continue 
  else:
    qr.add_data(str(sheet.cell(row=i, column=1).value))
    qr.make(fit=True)
    img = qr.make_image()
    img.save(folder_selected + "/" + "row_"+str(i)+"_qrcode.png")
    img=openpyxl.drawing.image.Image(folder_selected + "/" + "row_"+str(i)+"_qrcode.png")
    img.anchor = "B" + str(i)
    sheet.add_image(img)
    sheet["B" + str(i)].alignment = Alignment(horizontal='center', vertical='center')
    sheet["A" + str(i)].alignment = Alignment(horizontal='center', vertical='center')


# saving the excel file
workbook.save(folder_selected+ "/qrcode_produced.xlsx")

如何读取Excel个文件，生成二维码？

How to read Excel file, create a QR code?

python

openpyxl