Add figure related to string intern

satwikkansal · satwikkansal · commit 674fc891b479 · 2018-01-23T14:40:49.000+05:30
diff --git a/README.md b/README.md
@@ -561,6 +561,7 @@ Makes sense, right?
   * All length 0 and length 1 strings are interned.
   * Strings are interned at compile time (`'wtf'` will be interned but `''.join(['w', 't', 'f']` will not be interned)
   * Strings that are not composed of ASCII letters, digits or underscores, are not interned. This explains why `'wtf!'` was not interned due to `!`.
+  <img src="/images/string-intern/string_intern.png" alt="">
 + When `a` and `b` are set to `"wtf!"` in the same line, the Python interpreter creates a new object, then references the second variable at the same time. If you do it on separate lines, it doesn't "know" that there's already `wtf!` as an object (because `"wtf!"` is not implicitly interned as per the facts mentioned above). It's a compiler optimization and specifically applies to the interactive environment.
 
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