我正在使用python生成LaTeX代码（长话大说-我需要进行120多次独特的考试）。
This means that I have lots of strings that have \ or { or } etc. So I'm making them literals. However, I also want to have Python calculate numbers and put them in. So I might have a string like:
r"What is the domain of the function $\exp{-1/(VARIABLE - x^2+y^2)}$?" which I want to write to a file. But I want VARIABLE to be a random numerical value. The question isn't how to calculate VARIABLE, but rather is there a clean way to put VARIABLE into the string, without something like:
r"What is the domain of the function $\exp{-1/(" + str(VARIABLE) + r"- x^2+y^2)}$?"
我将做很多事情，因此，如果可行，那就太好了。我有Python 3.5.2。
