python3 nested dictionary unpack for format string

Question

I am trying to pass a dictionary (loaded from JSON file) to format string. While single key-value unpack works correctly, I am not sure how I can access the nested keys (children) with a format string.

Or is there any other better way to pass JSON to string format?

config = {
    "TEST": "TEST",
    "TEST1": "TEST1",
    "TEST2": {
        "TEST21": "TEST21"
    }
}

query_1 = """
    {TEST} {TEST1}
"""
query_2 = """
    {TEST} {TEST1}
    {TEST2.TEST21}
"""

print(query_1.format( **config ))  # WORKING
print(query_2.format( **config ))  # NOT WORKING

buran · Accepted Answer · 2020-10-12 09:10:06Z

1

Using f-string

config = {
    "TEST": "TEST",
    "TEST1": "TEST1",
    "TEST2": {
        "TEST21": "TEST21"
    }
}

query_2 = f"""
    {config['TEST']} {config['TEST1']}
    {config['TEST2']['TEST21']}
"""

print(query_2)

Note, if query is sql query, there is probably better way to do what you do, not using string formatting

answered Oct 12, 2020 at 9:10

buran

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1 Comment

Jiho Choi Over a year ago

Thank you for your nice suggestion!

Chetan Ameta · Accepted Answer · 2020-10-12 09:08:49Z

1

In your query_2 change {TEST2.TEST21} to {TEST2[TEST21]} it will work.

Ex.

query_2 = """
    {TEST} {TEST1}
    {TEST2[TEST21]}
"""
print(query_2.format(**config))

Output

TEST TEST1
TEST21

answered Oct 12, 2020 at 9:08

Chetan Ameta

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