python - Bash: Variable in single quote

Question

First take a look at this question: Bash or GoogleCL: new line in a string parameter

I want to add a variable ${date} into the "summary" now:

google youtube post ~/videos/cat-falls-down-stairs.avi Comedy 
    --tags 'currency of the internet' 
    --summary $'Today is ${date}. Poor whiskers takes a tumble.
She'''s fine, though, don'''t worry.'

but variable wont expand inside single quote in bash.

Is is possible to do that?

Note: GoogleCL is a command-line program written in python. I am on Ubuntu 10.10 with Python 2.6.

Answer 1

Rather than attempting to expand a variable inside a single quoted string, the typical solution is to concatenate single and double quoted strings. In other words:

'Today is'"${date}"'. Poor' ...