How to read and write dictionaries to external files in python?

2018-06-13 08:09:35

This question already has an answer here:

Parsing values from a JSON file? 7 answers

Let's create a dictionary:

>>> d = {'guitar':'Jerry', 'drums':'Mickey' }

Now, let's dump it to a file:

>>> import json
>>> json.dump(d, open('1.json', 'w'))

Now, let's read it back in:

>>> json.load(open('1.json', 'r'))
{'guitar': 'Jerry', 'drums': 'Mickey'}

Taking better care of file handles

The above illustrates the json module but was sloppy about closing files. Better:

>>> with open('1.json', 'w') as f:
...     json.dump(d, f)
... 
>>> with open('1.json') as f:
...     json.load(f)
... 
{'guitar': 'Jerry', 'drums': 'Mickey'}

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