Python chunks not echo-ing

[isteves]

My Python chunks are not showing the outputs unless I print() them explicitly. Is this expected behavior? (I'm used to being able to see chunk outputs in Jupyter.) As far as I can tell, this issue may be related: rstudio/rstudio#3271

```{python echo = TRUE}
my_dict = {'apples': 3, 'oranges': 5}
my_dict
```

```{python}
print(my_dict)
```

I'm using RStudio 1.2.1237, knitr 1.21, reticulate 1.10

Noted: I edited the language from when I first wrote this issue because I realized I'd mixed up what "echo" meant. 😬

[kevinushey]

I believe this issue is fixed in the development version of reticulate -- can you install that and give it a shot?

devtools::install_github("rstudio/reticulate")

[isteves]

@kevinushey I had some tar-ing issues with installation (similar to r-lib/devtools#1939), but it worked beautifully once it was installed. Thanks!