Python ReportLab

[ek5442]

I need to generate pdf report Avery 5160 format. I am having trouble displaying report on multiple pages. 

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[/font][/color] [color=#222222][font=Verdana, arial, sans-serif]""" [/font][/color]     Created by Egor Kozitski   """   from reportlab.pdfgen import canvas   from reportlab.lib.pagesizes import LETTER   from reportlab.lib.units import inch,mm   from reportlab.graphics.barcode import code128   import json,sys,operator,itertools   """       @class LabelGenerator will generate Lbels using reportlab       @param filelocation is the location of the file where file will be saved   """   class LabelGenerator():           def __init__(self,fileLocation):           self.fileLocation = fileLocation           self.canv = canvas.Canvas(self.fileLocation,pagesize=LETTER)           self.canv.setPageCompression(0)           #LABELW is the width of the label           self.LABELW = 2.6 * inch           #LABELSEP  is the label separation           self.LABELSEP = 2.75 * inch           #LABELH is the height of the label           self.LABELH = 1 * inch       #helper method to split list into chunks of 30 elements       def grouper(self,n, iterable):           #create iterable object out of iterable           it = iter(iterable)           #iterate infinitely and create chunks           while True:               #slice iterable by n ammount of elements               chunk = list(itertools.islice(it, n))               if not chunk:                   return               #yield back the result               yield chunk           def label_position(self,ordinal):           """               @method label_position will find the coordinates for the next label               @param ordinal is the label number for which to find postion           """           y,x = divmod(ordinal , 3)           x = 14 + x * self.LABELSEP           y = 756 - y * self.LABELH           #return the coordinates           return x , y           def label_generator(self,json_list):           """           @method label_generator will generate labels for n ammount of items           """           # self.generate_label(json_list)           if len(json_list) < 30:               self.generate_label(json_list)           else:                   for label in list(self.grouper(30,json_list)):                   self.generate_label(label)                   self.canv.showPage()               self.canv.save()                       def generate_label(self,json_list):           """               @method generate_label will iterate over list of labels and generate labels           """               #iterate over list of labels           for i in range(1,len(json_list)+1):               #iterate over the label to extract Order and make sure that its matches index               for item in json_list:                   #if we find the match than generate label                   if item['Order'] == str(i):                       #set barcode width                       barcode_setBarWidth = 1                       #set coordinates for label                       x,y = self.label_position(i-1)                       #while true iterate infinitely and generate the right baarcode                       while True:                           barcode = code128.Code128(item['UPC'],barHeight=6*mm,\                                                                 barWidth=barcode_setBarWidth)                           if barcode.width >= 300:                               barcode_setBarWidth = barcode_setBarWidth - 0.01                           else:                               break                       #get image from the item and scale it to the size of the label                       #postion it to the right position                       self.canv.drawImage("image.png",x,y,width=self.LABELW,height=-self.LABELH+10)                       #create text object which will hold UPC number                       #position text in the label                       text = self.canv.beginText(x+22,y-55)                       #draw barcode on the label                       barcode.drawOn(self.canv,x-15,y-48)                       #set text style and fond                       text.setFont('Helvetica',7,7)                       #set the text to be drawn                       text.textLines(item['UPC'])                       #draw text on the canvas                       self.canv.drawText(text)                       #save it into pdf                   # self.canv.save()                   if __name__ =='__main__':       json_list = """[{"TemplateID":"Microsoft 4YM-0016","UPC":"854024427546","Order":"1"},{"TemplateID":"Microsoft 4YM-0016","UPC":"896070896551","Order":"2"},{"TemplateID":"Microsoft 4YM-0016","UPC":"492535039795","Order":"3"},{"TemplateID":"Microsoft 4YM-0016","UPC":"980144179532","Order":"4"},{"TemplateID":"Microsoft 4YM-0016","UPC":"953237474752","Order":"5"},{"TemplateID":"Microsoft 4YM-0016","UPC":"800403475381","Order":"6"},{"TemplateID":"Microsoft 4YM-0016","UPC":"459867062992","Order":"7"},{"TemplateID":"Microsoft 4YM-0016","UPC":"314882354925","Order":"8"},{"TemplateID":"Microsoft 4YM-0016","UPC":"421298698843","Order":"9"},{"TemplateID":"Microsoft 4YM-0016","UPC":"146153461080","Order":"10"},{"TemplateID":"Microsoft 4YM-0016","UPC":"854805864303","Order":"11"},{"TemplateID":"Microsoft 4YM-0016","UPC":"678579770722","Order":"12"},{"TemplateID":"Microsoft 4YM-0016","UPC":"168480935247","Order":"13"},{"TemplateID":"Microsoft 4YM-0016","UPC":"668791157220","Order":"14"},{"TemplateID":"Microsoft 4YM-0016","UPC":"740939140828","Order":"15"},{"TemplateID":"Microsoft 4YM-0016","UPC":"001570965556","Order":"16"},{"TemplateID":"Microsoft 4YM-0016","UPC":"324975221753","Order":"17"},{"TemplateID":"Microsoft 4YM-0016","UPC":"120476838669","Order":"18"},{"TemplateID":"Microsoft 4YM-0016","UPC":"598077900477","Order":"19"},{"TemplateID":"Microsoft 4YM-0016","UPC":"250843881374","Order":"20"},{"TemplateID":"Microsoft 4YM-0016","UPC":"811257091846","Order":"21"},{"TemplateID":"Microsoft 4YM-0016","UPC":"915409953650","Order":"22"},{"TemplateID":"Microsoft 4YM-0016","UPC":"881926369040","Order":"23"},{"TemplateID":"Microsoft 4YM-0016","UPC":"062532812772","Order":"24"},{"TemplateID":"Microsoft 4YM-0016","UPC":"073714100107","Order":"25"},{"TemplateID":"Microsoft 4YM-0016","UPC":"212960117066","Order":"26"},{"TemplateID":"Microsoft 4YM-0016","UPC":"506050029642","Order":"27"},{"TemplateID":"Microsoft 4YM-0016","UPC":"016286646554","Order":"28"},{"TemplateID":"Microsoft 4YM-0016","UPC":"294969321128","Order":"29"},{"TemplateID":"Microsoft 4YM-0016","UPC":"929011126614","Order":"30"},{"TemplateID":"Microsoft 4YM-0016","UPC":"529476319910","Order":"31"},{"TemplateID":"Microsoft 4YM-0016","UPC":"727535059435","Order":"32"},{"TemplateID":"Microsoft 4YM-0016","UPC":"986364488579","Order":"33"},{"TemplateID":"Microsoft 4YM-0016","UPC":"395522038237","Order":"34"},{"TemplateID":"Microsoft 4YM-0016","UPC":"229477467590","Order":"35"},{"TemplateID":"Microsoft 4YM-0016","UPC":"918033470486","Order":"36"},{"TemplateID":"Microsoft 4YM-0016","UPC":"800393354664","Order":"37"},{"TemplateID":"Microsoft 4YM-0016","UPC":"088054124430","Order":"38"},{"TemplateID":"Microsoft 4YM-0016","UPC":"324938407073","Order":"39"},{"TemplateID":"Microsoft 4YM-0016","UPC":"830941102460","Order":"40"},{"TemplateID":"Microsoft 4YM-0016","UPC":"941487562347","Order":"41"},{"TemplateID":"Microsoft 4YM-0016","UPC":"801340683962","Order":"42"},{"TemplateID":"Microsoft 4YM-0016","UPC":"189323958875","Order":"43"},{"TemplateID":"Microsoft 4YM-0016","UPC":"746227509638","Order":"44"},{"TemplateID":"Microsoft 4YM-0016","UPC":"055060376660","Order":"45"},{"TemplateID":"Microsoft 4YM-0016","UPC":"446781569032","Order":"46"},{"TemplateID":"Microsoft 4YM-0016","UPC":"423709974662","Order":"47"},{"TemplateID":"Microsoft 4YM-0016","UPC":"587053879378","Order":"48"},{"TemplateID":"Microsoft 4YM-0016","UPC":"747103897209","Order":"49"},{"TemplateID":"Microsoft 4YM-0016","UPC":"258132557428","Order":"50"},{"TemplateID":"Microsoft 4YM-0016","UPC":"488228790214","Order":"51"},{"TemplateID":"Microsoft 4YM-0016","UPC":"425761168401","Order":"52"},{"TemplateID":"Microsoft 4YM-0016","UPC":"827175725340","Order":"53"},{"TemplateID":"Microsoft 4YM-0016","UPC":"560804923240","Order":"54"},{"TemplateID":"Microsoft 4YM-0016","UPC":"161877874043","Order":"55"},{"TemplateID":"Microsoft 4YM-0016","UPC":"886087107202","Order":"56"},{"TemplateID":"Microsoft 4YM-0016","UPC":"211523352048","Order":"57"},{"TemplateID":"Microsoft 4YM-0016","UPC":"818659045277","Order":"58"},{"TemplateID":"Microsoft 4YM-0016","UPC":"960161455387","Order":"59"},{"TemplateID":"Microsoft 4YM-0016","UPC":"802917018499","Order":"60"},{"TemplateID":"Microsoft 4YM-0016","UPC":"656937238692","Order":"61"},{"TemplateID":"Microsoft 4YM-0016","UPC":"694357455377","Order":"62"},{"TemplateID":"Microsoft 4YM-0016","UPC":"735951196240","Order":"63"},{"TemplateID":"Microsoft 4YM-0016","UPC":"678074643581","Order":"64"},{"TemplateID":"Microsoft 4YM-0016","UPC":"551659479192","Order":"65"},{"TemplateID":"Microsoft 4YM-0016","UPC":"527330347299","Order":"66"},{"TemplateID":"Microsoft 4YM-0016","UPC":"637794765129","Order":"67"},{"TemplateID":"Microsoft 4YM-0016","UPC":"806857974484","Order":"68"},{"TemplateID":"Microsoft 4YM-0016","UPC":"303689331607","Order":"69"}]"""       #create object       label = LabelGenerator("OttoVonBismark")       #generate pdf file [color=#222222][font=Verdana, arial, sans-serif]    label.label_generator(json.loads(json_list))   [/font][/color] [color=#222222][font=Verdana, arial, sans-serif]

I am using json_list as a sample.
I think I am doing something wrong in the label_generator. The output is just one page with 30 labels

[Larz60+]

can you insert a PageBreak?

[ek5442]

I found the problem and now I am trying to fix it. My problem is when I am trying to sort by Order which is line 148 and down

[Larz60+]

This is not what's causing the problem, but:

1 2 3 4 5

for i in range(1,len(json_list)+1):                #iterate over the label to extract Order and make sure that its matches index                for item in json_list:

can be replaced with:

1	for i, item in enumerate(json_list):

You can sort the list with:

1	json_lsit = json_list.sort()

[ek5442]

Hmm , than I do not understand what do you mean by PageBreak

[Larz60+]

Hmm , than I do not understand what do you mean by PageBreak

see page 92 of doc.

---

Sorry you can't sort it that way, I thought it was a regular list (even though named json_list)

[ek5442]

I rewrote it with this

1	sorted(json.loads(json_list),key=lambda d:("Order" not in d, int(d.get("Order"))))