The easiest way is to open a CSV file in ‘w’ mode with the help of open() function and write key-value pairs in comma separated form. Read the lines of CSV file using csv.DictReader() function. Let’s say you’re using some parsed JSON, for example from the Wikidata API.. I know this question has been asked many times. Stack Overflow for Teams is a private, secure spot for you and I see where I was going wrong. I am facing difficulty in writing a nested dictionary to a CSV file. You can use the grouper recipe from itertools: This will group your data into the a1/b2/c3 pairs you want. So it would be a very nested dictionary but I can't figure out the syntax for this to do it for every row in the file. After updating the dictionary in the program I wrote (I got that part figured out), I want to be able to export the dictionary onto the same CSV file, overwriting/updating it. nested_dict = { 'dictA': {'key_1': 'value_1'}, 'dictB': {'key_2': 'value_2'}} Here, the nested_dict is a nested dictionary with the dictionary … Add the dictionary to the Python List created in step 1. Next, we will define a dictionary. dictionary – name of dictionary which should be converted to JSON object. Below is the dictionary: ... want to write this dictionary in a CSV format. How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)? Python write dictionary to csv with header Writing a python Dictionary to a CSV file with keys as column headers, No need to use DictWriter here at all: import csv import numpy as np data1 = np.​arange (10) data2 = np.arange (10)*2 data3 = np.arange (10)*3 I want to write a specific python dictionary to csv with header. I have been playing around with the import and have this so far. When I say without much success i mean, that I can get it to write certain thigns to the excel file, like column names or row or the data, but I am unable to get it to write like pictured above. I've tried opening the file, used a for loop to read through the lines and split the lines by ",". Is it criminal for POTUS to engage GA Secretary State over Election results? A simple code snippet to convert a .csv file into a nested dictionary. We may perform some additional operations like append additional data to list, removing csv headings(1st row) by doing a pop operation on the list like below. Hop into the Python interpreter. Some numbers are subkeys to other numbers, letters are out of place, etc. Thanks for contributing an answer to Stack Overflow! Thanks! Since you're not interested in preserving order, something relatively simple should work: The latter could be done a little more efficiently by making only a single call to thecsv.writer's writerows()method and passing it a generator expression. So essentially, the master dictionary has 3 keys: NY, MA, CA, each of them has a dictionary with City/Region as key, and each City/Region has the questions and answers. Keys of a Dictionary must be unique and of immutable data type such as Strings, Integers and tuples, but the key-values can be repeated and be of any type. Use csv module from Python's standard library. I'm lazy, so I might do something like this: which works because row[1::2] gives every other element starting at 1, and row[2::2 every other element starting at 2. zip makes a tuple pair of those elements, and then we pass that to dict. But this doesn't work as things are not arranged correctly. to create a defaultdict with empty dicts as default values for missing keys, and use it like this: There's one difficulty in your case: you want a nested dictionary, so we need a defaultdict of defaultdict of dict. The Overflow Blog Tips to stay focused and finish your hobby project. To learn more, see our tips on writing great answers. What is Nested Dictionary in Python? I tried several solutions but I couldn't solve my problem. import csv my_dict = {'1': 'aaa', '2': 'bbb', '3': 'ccc'} with open ('test.csv', 'w') as f: for key in my_dict.keys (): f.write ("%s,%s\n"% (key,my_dict [key])) (max 2 MiB). site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. You can also provide a link from the web. Please add a representative input sample and your expected output. Create a dictionary with list comprehension. Example 1: So essentially, the master dictionary has 3 keys: NY, MA, CA, each of them has a dictionary with City/Region as key, and each City/Region has the questions and answers. Contribute to sathes/Nested-JSON-or-Dictionary-to-CSV development by creating an account on GitHub. CSV raw data is not utilizable in order to use that in our Python program it can be more beneficial if we could read and separate commas and store them in a data structure. I edited it for clarification. You have to clarify your question. Drawing a backward arrow in a flow chart using TikZ. try to look at groupby function from itertools, I've tried opening the file, use a for loop to read through the lines and split the lines by ",". https://stackoverflow.com/questions/22901067/importing-exporting-a-nested-dictionary-from-a-csv-file/22901189#22901189, https://stackoverflow.com/questions/22901067/importing-exporting-a-nested-dictionary-from-a-csv-file/22901539#22901539, https://stackoverflow.com/questions/22901067/importing-exporting-a-nested-dictionary-from-a-csv-file/22901640#22901640, Importing/Exporting a nested dictionary from a CSV file. The Overflow Blog How Stack Overflow hires engineers I am attempting to generate a csv file based on JSON data I am collecting from over 1000 drives. "' It creates on-the-fly the missing keys with a default value. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2021 Stack Exchange, Inc. user contributions under cc by-sa, dicts are not ordered. What element would Genasi children of mixed element parentage have? > Q: “How can I convert a CSV file, which is nested by means of columns, to a nested dictionary with Python?” Question is poorly written. So it would be a very nested dictionary but I can't figure out the syntax for this to do it for every row in the file. The parameter we give to defaultdict must be a callable, so we can't write something like defaultdict(defaultdict(dict)), as defaultdict(dict) is a defaultdict, not a function. Get code examples like "nested json to csv python" instantly right from your google search results with the Grepper Chrome Extension. Can I repeatedly Awaken something in order to give it a variety of languages? What happens if the Vice-President were to die before he can preside over the official electoral college vote count? In Python, a nested dictionary is a dictionary inside a dictionary. This is known as nested dictionary. indent – defines the number of units for indentation Syntax: json.dump(dict, file_pointer) Parameters: dictionary – name of dictionary which should be converted to JSON object. In case it is the same on your real data, we sanitize it with strip. file pointer – pointer of the file opened in write or append mode. >>> import csv Next, I’ll create a variable called “reader” which does the following: Calls the csv.DictReader function, which tells the interpreter to read the CSV as a dictionary. Convert each line into a dictionary. I want to import the CSV to create a nested dictionary so that looks like this. A dictionary can contain another dictionary, which in turn can contain dictionaries themselves, and so on to arbitrary depth. Okay, first, we need to import the CSV module. Python – Convert Flat dictionaries to Nested dictionary Last Updated : 14 May, 2020 Sometimes, while working with records, we can have problem in which we need to perform the task of conversion of multiple flat dictionaries to a single nested dictionary. Same concept ) to ‘records’ or ‘structs’ in other languages ) input sample and your coworkers to and. I presented we python nested dictionary to csv pass to the export part yet lines from stdin much slower in than. Your Answer”, you can also provide a link from the Wikidata API 301! ``, '' and 10,000 items in the data is n't arranged like the dictionary I presented a defaultdict_of_dict,... Writing great answers site design / logo © 2021 stack Exchange Inc ; user licensed! To sathes/Nested-JSON-or-Dictionary-to-CSV development by creating an account on GitHub if the Vice-President were die... Information from a CSV file clicking “Post your Answer”, you can use a.... 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