Format floats with standard json module

by

Note: This does not work in any recent version of Python.

Unfortunately, I believe you have to do this by monkey-patching (which, to my opinion, indicates a design defect in the standard library json package). E.g., this code:

import json
from json import encoder
encoder.FLOAT_REPR = lambda o: format(o, '.2f')
    
print(json.dumps(23.67))
print(json.dumps([23.67, 23.97, 23.87]))

emits:

23.67
[23.67, 23.97, 23.87]

as you desire. Obviously, there should be an architected way to override FLOAT_REPR so that EVERY representation of a float is under your control if you wish it to be; but unfortunately that’s not how the json package was designed.

More Related Contents:

  1. How to prettyprint a JSON file?
  2. Python JSON serialize a Decimal object
  3. Formatting floats without trailing zeros
  4. Easy pretty printing of floats?
  5. Loading JSON file Using Python Utils Library
  6. How to POST JSON data with Python Requests?
  7. How to convert JSON data into a Python object?
  8. Convert floats to ints in Pandas?
  9. What is the best way to compare floats for almost-equality in Python?
  10. What are the differences between json and simplejson Python modules?
  11. How to convert CSV file to multiline JSON?
  12. Range values to pseudocolor
  13. Return JSON response from Flask view
  14. How to recursively find specific key in nested JSON?
  15. Python datetime formatting without zero-padding
  16. Trying to parse `request.body` from POST in Django [duplicate]
  17. Python: Read several json files from a folder
  18. How to add a key-value to JSON data retrieved from a file?
  19. Python floating point number comparison
  20. How to send requests with JSON in unit tests
  21. Python to JSON Serialization fails on Decimal [duplicate]
  22. Python serializable objects json [duplicate]
  23. Parsing json and searching through it
  24. How to get largest possible precision? (Python – Decimal)
  25. What is the difference between json.dumps and json.load? [closed]
  26. How to merge two json string in Python?
  27. Issue with merging multiple JSON files in Python
  28. How to Fix JSON Key Values without double-quotes?
  29. Handle JSON Decode Error when nothing returned
  30. Convert nested JSON to CSV file in Python

Leave a Comment