get specific list by value python

Question

I have a list of dictionary looks like this.

charts = [[{'select': 'scatter-form'}], [{'select': 'line-form'}]]

I want to get the list by the value of 'select' key.
For example:

scatterform = [{'select': 'scatter-form'}]
lineform = [{'select': 'line-form'}]

this one is not working because of some error list indices must be integers or slices, not str

Asked By: Gnani Kim

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Source

Answer 1

New answer:

Since the original post is edited, I updated my answer.

First, If you certain that the ‘select’ value is unique and not missing,

charts = [[{'select': 'scatter-form'}], [{'select': 'line-form'}]]

scatterform = None
lineform = None
for chart in charts:
    if chart[0]['select'] == 'scatter-form':
        scatterform = chart
    elif chart[0]['select'] == 'line-form':
        lineform = chart
assert scatterform is not None
assert lineform is not None

will work.
or, if there could be many same ‘select’ values or could be none, you can do following:

charts = [[{'select': 'scatter-form'}], [{'select': 'line-form'}]]

scatterforms = [chart for chart in charts if chart[0]['select'] == 'scatter-form']
lineforms = [chart for chart in charts if chart[0]['select'] == 'line-form']
print(scatterforms, lineforms)

output:

[[{'select': 'scatter-form'}]] [[{'select': 'line-form'}]]

Old answer:

charts is a nested list. You should iterate it.

charts = [[{'select': 'scatter-form'}], [{'select': 'line-form'}]]


for [chart] in charts:
    if chart['select'] == "scatter-form":
       print("scatter-form") or [{'select': 'scatter-form'}]
    if chart['select'] == "line-form":
       print("line-form") or [{'select': 'line-form'}]

output:

scatter-form
line-form

or

for chart in charts:
    if chart[0]['select'] == "scatter-form":
       print("scatter-form") or [{'select': 'scatter-form'}]
    if chart[0]['select'] == "line-form":
       print("line-form") or [{'select': 'line-form'}]

Answered By: Boseong Choi

get specific list by value python

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