[issue28984] json.dump + indent creates trailing extra spaces
Josh Rosenberg
report at bugs.python.org
Thu Dec 15 19:43:13 EST 2016
Josh Rosenberg added the comment:
This is documented behavior for Python 2 ( https://docs.python.org/2/library/json.html#basic-usage ):
>Note: Since the default item separator is ', ', the output might include trailing whitespace when indent is specified. You can use separators=(',', ': ') to avoid this.
and also:
If specified, separators should be an (item_separator, key_separator) tuple. By default, (', ', ': ') are used. To get the most compact JSON representation, you should specify (',', ':') to eliminate whitespace.
Python 3 gives a different guarantee (dynamically chosen default separators based on the value of indent), and it follows that contract.
Given it's clearly documented, easily worked around, and largely harmless, I see no strong argument for backporting the Python 3 behavior to the legacy codebase.
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nosy: +josh.r
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