Extracting a list from a string in python

Question

I have a list of JSON objects as a string.

str = "[{'key1':'value1','key2':'value2'}, {'key1':'value1','key2':'value2','key3':'value3'}]"

Is there any way to store the string as a list into a variable?

arr = [{'key1':'value1','key2':'value2'}, {'key1':'value1','key2':'value2','key3':'value3'}]

Yep, missed that. Well in this case a simple arr = eval(str) will work just fine — hurlenko
– hurlenko, Commented Mar 23, 2020 at 17:49
@hurlenko thanks for the help, but eval would fail if any value is null. json.load() should do the trick if we make the JSON valid. — Abhijeet-AR
– Abhijeet-AR, Commented Mar 23, 2020 at 18:05

azro · Accepted Answer · 2020-03-23 17:48:13Z

4

To not be bother by the json-quote problem, just use eval or ast.literal_eval

value = eval(value)

Because to have valid JSON, you may have double quotes, then pass it to json.loads, but this could be a problem if you have a double or single quote in the content

value = "[{'key1':'value1','key2':'value2'}, {'key1':'value1','key2':'value2','key3':'value3'}]"
value = json.loads(value.replace("'", '"'))

edited Mar 23, 2020 at 17:48

answered Mar 23, 2020 at 17:42

azro

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1 Comment

bereal Over a year ago

This is likely to break if any of the string values contains '.

kederrac · Accepted Answer · 2020-03-23 17:44:04Z

3

you could use ast.literal_eval:

from ast import literal_eval
my_str = "[{'key1':'value1','key2':'value2'}, {'key1':'value1','key2':'value2','key3':'value3'}]"
arr = literal_eval(my_str)
arr

output:

[{'key1': 'value1', 'key2': 'value2'},
 {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}]

answered Mar 23, 2020 at 17:44

kederrac

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