Django read csv file in view

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Django read csv file in view

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I'm a full-stack developer who loves technology, comic books and building products. Here is what I'm up to now. I didn't want this functionality accessible to users so it didn't make sense to build the CSV file import into the main application. The only other place on the app where this form could live is the Django admin at least for now.

There is a lot that can be done with the Django admin but I don't typically believe in building the Django admin as a replacement for advanced functionality. The Django admin is a huge benefit and saves a ton of time but I believe it shines when you use it as a tool to update your database tables. It's the perfect admin for things like a blog or for your support team but once you start building in heavy customization, I believe it's time to look for another solution.

The first thing I wanted to do was add a button to the top of the admin page that brings you to a Django form. This form will allow you to select your file and associate the imported data with a another table.

From here create a new block using the object-tools-items template block and you can add the button as a list item like below. Since I want to create a new admin page that will display a form to upload the CSV file, I'm going to have the button link go to a view that I built that will load the form page.

The view itself is pretty straightforward. There are a few areas in the view that still need to be cleaned up as I found it a bit challenging to subclass the right Django admin views.

django read csv file in view

The main challenge here is making sure the links in the breadcrumbs bar show up properly as well as the site header and the permissions. Because of this I basically hard coded these parts of the view, which isn't the best thing to do as it could cause bugs when changes are made in the future. For now I felt this was good enough and will update it in the future. There are two classes that I built to make the view work.

The first is the form that I'll be using to upload my CSV file and process the file itself. The logic is very simple, all we're doing is reading the CSV file and adding the values in the column to a table in the database. The CSV file is controlled internally so I don't have to worry about different formats or anything like that.

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As you can see the form is pretty straight forward. I have two fields that I'm using to capture the CSV file.

The BulkCreateManager allows us to bulk create records instead of inserting them one by one. It's a great little utility class put together by the CaktusGroup which you can read about here.

There is a little more going on with the view. I'm sure there is a cleaner way to do this by inheriting another set of admin views but at this time hard coding has worked for me. Once I have time to clean this up, I'll be sure to update the article. There are a few minor things we have to do on the template itself.

In order to make the breadcrumbs link show up as they do with the rest of the Django admin, we need to fill in th breadcrumbs block on our template. Once we setup the breadcrumbs we can then setup the rest of our form, just like we would in any other template.Python comes with a CSV library, csv.

For example, by streaming a file that takes a long time to generate you can avoid a load balancer dropping a connection that might have otherwise timed out while the server was generating the response.

In this example, we make full use of Python generators to efficiently handle the assembly and transmission of a large CSV file:. Alternatively, you can use the Django template system to generate CSV.

This is lower-level than using the convenient Python csv module, but the solution is presented here for completeness.

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The idea here is to pass a list of items to your template, and have the template output the commas in a for loop. The only difference between this example and the previous example is that this one uses template loading instead of the CSV module. This template is quite basic. It just iterates over the given data and displays a line of CSV for each row.

You can use either of these techniques to output any text-based format you can dream of. You can also use a similar technique to generate arbitrary binary data; see Outputting PDFs with Django for an example. Enter search terms or a module, class or function name. Django 2. In this example, we make full use of Python generators to efficiently handle the assembly and transmission of a large CSV file: import csv from django.

How to Export CSV File With Django

The range is based on the maximum number of rows that can be handled by a single sheet in most spreadsheet applications. Quick search Enter search terms or a module, class or function name.It is based on the django-style declarative model. If you now want to interact with a django model, you just have to add a dbModel option to the class meta. If field names of your Csv model does not match the field names of your django model, you can manage this with the match keyword:.

Apply the function before returning the result. Here is an example of a way to use the transform attribute. You can also skip a row during preparetransform or in a validator by raising a SkipRow exception. Set it to LinearLayout by default or Tabular Layout.

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Modify the way your data are organised in. Tabular read:. A3 C7 C8 C9. This allow to add a value to any line of the csv file before the loading. If you want to create more than object by line, you should use a group CSV model. Some additionnal supported parameters are:.

django read csv file in view

For any questions, you can contact me at csv. CSV Importer latest. Model Decimal FloatField : return a float CharField : return a string DateField : return a datetime ForeignKey : return a django model object IgnoredField : skip the value ComposedKeyForeign : return a django model object retrieve with multiple values as keys. If a list is defined, all the field matching will received the value.

django read csv file in view

A class which should implement a validate function: def validate self, value : and return a Boolean. This allow to apply some business validation on the object before uploading. If you do not set one, the sniffer will try to find one itself. CsvDbModel only. To do take into account the django field of the django model defined in this list.

Tabular read: B1 B2 B3. If the value is found, update instead of creating a new object. If the value is not found, create a new object. If you want to retrieve multiple items, it should be set root element distinguish these items. Used to defined list of elements or just to organise your code better.In this article we will discuss how to upload an Excel file and then process the content without storing file on server.

One approach could be uploading the file, storing it in upload directory and then reading the file. Another approach could be uploading file and reading it directly from post data without storing it in memory and displaying the data. You may create a new project or work on existing code. If you are setting up a new project then create a new virtual environment and install Django 2.

adventures with parsing Django uploaded csv files in python3

Assuming you are working on existing project, follow the below steps to upload and process the excel file in Django. For this article, I have created a new small project using Django 2. Source code is available on Github. In Django 2. Now iterate over the rows in worksheet and for each row iterate over the cells and read the value in each cell. Now restart the python server and go to localhost You will see below screen.

After index view read the data from worksheet and render the page again, screen will look like below:. You can add validations to check file extension or file size. Refer the csv upload article for same. Related Articles: How to upload an Image file in Django This article explains the simple steps of uploading and storing an image in Django application, After storing the image, how to use it in Django template or emails, Uploading a file in Django, Storing image in Django model, Uploading and storing the image in Django model, HTML for multipart file upload Read Full Article How to download large csv files in Django How to download large csv file in Django, streaming the response, streaming large csv file in django, downloading large data in django without timeout, using django.

Read Full Article How to download data as CSV and Excel file in Django How to download excel file in django, download data csv and excel file in django, excel file in python, csv and excel file in django python, download excel python-Django Weekly letter pythonprogramming. Hi, To get the curated list of awesome python articles from all over the Internet, please subscribe with pythonprogramming. This is specifically suitable for beginners. Advertise with us.

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How to upload and process the Excel file in Django. We will work with the later approach here. Views: Create a function in views with the name index. This view will be responsible to read the excel file. We can get name of all sheets using below code. There is only one sheet in our excel file ['Sheet1'] You can either iterate over the sheet names or can get desired sheet by sheet name. To get the active sheet just use the wb.

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Use below code for the same.There are a bunch of answers on stackoverflow! They all totally work with Python 2! Error: iterator should return strings, not bytes did you open the file in text mode?

The seek statement ensures the pointer is at the beginning of the file. This may or may not be required in your case. Make sure that you know how your CSV is encoded to start with, though! Unicode, Dammit is going to be my friend here.

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Which I do. StringIO gives you the iterator that DictReader needs, while ensuring that your content remains stringy. Hopefully now you can copy these lines, and spend only a few minutes solving this problem!

Romantic analytical technologist librarian. View all posts by Andromeda. Like Like. Thanks, this is perfect for me too. Thanks so much for this! Thank you. This works with FileFields too! You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Skip to content.

Andromeda Uncategorized April 25, Python comes with a CSV library, csv. For example, by streaming a file that takes a long time to generate you can avoid a load balancer dropping a connection that might have otherwise timed out while the server was generating the response.

In this example, we make full use of Python generators to efficiently handle the assembly and transmission of a large CSV file:. Alternatively, you can use the Django template system to generate CSV.

This is lower-level than using the convenient Python csv module, but the solution is presented here for completeness. The idea here is to pass a list of items to your template, and have the template output the commas in a for loop. The only difference between this example and the previous example is that this one uses template loading instead of the CSV module. This template is quite basic.

It just iterates over the given data and displays a line of CSV for each row. You can use either of these techniques to output any text-based format you can dream of. You can also use a similar technique to generate arbitrary binary data; see Outputting PDFs with Django for an example. Integrating Django with a legacy database. Outputting PDFs with Django. Django 2. In this example, we make full use of Python generators to efficiently handle the assembly and transmission of a large CSV file: import csv from django.

The range is based on the maximum number of rows that can be handled by a single sheet in most spreadsheet applications. Quick search.Posted by: admin December 1, Leave a comment. I have some django models named Product. In Product there are some fields like namedescription and price. I want something like this:. If you want to use a library, a quick google search for csv and django reveals two libraries — django-csvimport and django-adaptors.

Introduction - Django File Upload Tutorial - Part 1

The first requires you to write a model to match the csv file, while the second is more of a command-line importer, which is a huge difference in the way you work with them, and each is good for a different type of project.

So which one to use? That depends on which of those will be better suited for your project in the long run. However, you can also avoid a library altogether, by writing your own django script to import your csv file, something along the lines of warning, pseudo-code ahead :.

Just — figure out what you want to do with your project, how many files do you need to handle and then — if you decide to use a library, try figuring out which one better suits your needs. The Python csv library can do your parsing and your code can translate them into Products.

You can also use, django-adaptors. You can use the django-csv-importer package.

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Use the Pandas library to create a dataframe of the csv data. Then create a list of model instances. Finally use the django method. I was using the answer by mmrs but saving each row instance was very slow and any fields containing the delimiting character even inside of quotes were not handled by the open — line.

django read csv file in view

You can give a try to django-import-export. It has nice admin integration, changes preview, can create, update, delete objects. The output will be the class model definition. In this case the model will be called Product.


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