Unexpected syntax error after loading reticulate package

Question

I've loaded "reticulate" package to run python code in Rstudio. Below the code:

# Initialize an empty dictionary
D = {} 

L = [['a', 1], ['b', 2], ['a', 3], ['c', 4]]

I get the following error:

Error: unexpected '[[' in "L = [["

Why did this happen?

No answers on Google helped me.

What you've shown in your question is **valid** Python. If *reticulate* (whatever that is) thinks it's wrong then maybe someone interested in *reticulate* can help. It's not a Python issue — DarkKnight, May 30 '23 at 15:57
That's not a Python error message. I don't know anything about the other tools you mentioned though. — wjandrea, May 30 '23 at 15:58
Probably RStudio is running this is as if it were R code, not Python. Does your file have a `.py` extension? — slothrop, May 30 '23 at 16:00
Or, more broadly: are you using one of the methods described here to run Python code? https://rstudio.github.io/reticulate/ — slothrop, May 30 '23 at 16:06
As slothrop suggested, basically I hadn't saved file with .py extension. — Fra_Silver, May 31 '23 at 06:01

score 0 · Answer 1 · answered May 30 '23 at 19:11

I guess you can try

py_run_string("L = [['a', 1], ['b', 2], ['a', 3], ['c', 4]]")

such that

> L
[[1]]
[[1]][[1]]
[1] "a"

[[1]][[2]]
[1] 1


[[2]]
[[2]][[1]]
[1] "b"

[[2]][[2]]
[1] 2


[[3]]
[[3]][[1]]
[1] "a"

[[3]][[2]]
[1] 3


[[4]]
[[4]][[1]]
[1] "c"

[[4]][[2]]
[1] 4

Unexpected syntax error after loading reticulate package

1 Answers1