String formatting a python nested dict

Question

bag_id = 'abcd'
result_str = "{'affiliate_details.affiliate_bag_id': '{bag_id}'}".format(bag_id)

I want the output result_str as "{'affiliate_details.affiliate_bag_id':'abcd' }"

It gives a key error - affiliate_details

I tried with unpacking them using **{'bag_id':'abcd'} in the format but it too gives the same result. I think its assuming the kwarg for affiliate_details but how do I deal with a nested one?

Also tried providing this but it gives same error

result_str = "{'affiliate_details.affiliate_bag_id': '{bag_id}'}".format(**{'affiliate_details':'affiliate_details', 'bag_id':'abcd'})

Jean-François Fabre · Accepted Answer · 2019-01-02 16:06:06Z

2

how can python know where to search for format placeholders?

You have to escape the curly braces you want as bare curly braces:

"{{'affiliate_details.affiliate_bag_id': '{bag_id}'}}".format(bag_id=bag_id)

maybe you'd better build a real dictionary and serialize it:

result_dict = {'affiliate_details.affiliate_bag_id': bag_id}

then:

str(result_dict)

or

json.dumps(result_dict)

(slight differences when using json, with None and booleans, but you can use indentation options)

answered Jan 2, 2019 at 16:06

Jean-François Fabre♦

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2 Comments

Arjunsingh Over a year ago

I was actually using JSONBender and wanted to try it out in a single statement rather than calling a function and dumping json. Thanks for your answer... :)

Jean-François Fabre Over a year ago

answer also applies to any third party json serializer/parser as well of course :)

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