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pythonstringformat
Roie Labes
Roie Labes

Reputation: 65

How to format named params into strings dynamically in Python?

I have an array with parameters - for each parameter I have a name and a value. Is there a way to format it dynamically into a string with a placeholders?

array:

[{'name': "a", 'value': "123"}, {'name': "b", 'value': "456"}]

string: "blabla {a}"

required result: "blabla 123"

Upvotes: 1

Views: 1136

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1122232

Because your string input already uses valid string formatting placeholders, all you need to do is convert your existing data structure to a dictonary mapping names to values:

template_values = {d['name']: d['value'] for d in list_of_dictionaries}

then apply that dictionary to your template strings with the **mapping call syntax to the str.format() method on the template string:

result = template_string.format(**template_values)

Demo:

>>> list_of_dictionaries = [{'name': "a", 'value': "123"}, {'name': "b", 'value': "456"}]
>>> template_string = "blabla {a}"
>>> template_values = {d['name']: d['value'] for d in list_of_dictionaries}
>>> template_values
{'a': '123', 'b': '456'}
>>> template_string.format(**template_values)
'blabla 123'

Upvotes: 5

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