How to change part of the value string in Python Dictionary?

[sbabu]

Hi All,

I am a self learner. I am not part of any educational institute. I collected some books and material and working on them.

Even though I completed one basic course I could not get the idea of this replace and append trick. Now I started another course.

I appreciate if some one can advise me on how to train the brain to think certain way. Are there any brain exercises to improve my thinking?

Thank U.