I want to use eval in the middle of the following python statement:
["a", "b"] + eval('[1,2].append(3)')
but because it does not return any value (it works in an “in place” manner), I cannot actually use it there and instead I receive an error of TypeError: can only concatenate list (not "NoneType") to list
. Is there any way that I can fix this issue by getting return value out of eval in Python?
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Answer
You can use list concatenation instead of calling append()
. It returns the new list.
["a", "b"] + eval('[1,2] + [3]')