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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<http://bugs.python.org/issue28984>
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