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Whitespaces are a Production Risk

Count one violation each time a format replacement field contains a whitespace. bad

print "{ what} is {how it is}".format({"what": "life", "how it is": "hard"})
# Output: KeyError; the correct key would be ' what' with a leading whitespace

print "{ what} is {how it is}".format({" what": "life", "how it is": "hard"})
# Output: KeyError; notice the double whitespace in the placeholder

good

print "{what} is {how_it_is}".format({"what": "life", "how_it_is": "so much easier if you use QuantifiedCode"})
# Output: "life is so much easier if you use QuantifiedCode"

Why you should care

If you use a replacement field like { var} in your format string, which contains a whitespace in its name, the key of the corresponding entry in your dictionary must contain this whitespace, too. Since whitespaces are easy to miss and you should avoid them.

Business Impacts

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CAST recommendations

References

https://www.quantifiedcode.com/knowledge-base/correctness/Avoid%20whitespaces%20in%20your%20replacement%20field%20names/9n9zeiZc [nz_btn text="See features" link="http://casthighlight.wpengine.com/outputs-analytics/" target="_self" icon="icon-stats" animate="false" animation_type="ghost" color="black" size="small" shape="rounded" type="normal" hover_normal="fill" hover_ghost="fill"][nz_btn text="How it works" link="http://casthighlight.wpengine.com/how-it-works/" target="_self" icon="icon-cog" animate="false" animation_type="ghost" color="black" size="small" shape="rounded" type="ghost" hover_normal="fill" hover_ghost="fill"]