diff --git a/README.md b/README.md index 8f116bd..1555f63 100644 --- a/README.md +++ b/README.md @@ -1258,6 +1258,58 @@ False The built-in `ord()` function returns a character's Unicode [code point](https://en.wikipedia.org/wiki/Code_point), and different code positions of Cyrillic 'e' and Latin 'e' justify the behavior of the above example. +--- + + ### ▶ Sets discriminating values? * + + ```py + >>> st = set() + >>> st.add(5) + >>> st.add(5) + >>> st.add(10) + >>> st.add(10) + >>> st.add(10) + >>> st.add(20) + >>> st.add(2) + >>> st.add(345678) + >>> st1 = set(sorted(st)) + ``` + + **Output:** + ```py + >>> st + {2, 5, 10, 345678, 20} + >>> st1 + {2, 5, 10, 345678, 20} + ``` + Everything looks pretty sorted ... just why are sets messing up with 345678? + + + #### 💡 Explanation: + + * This is because a set object is "an unordered collection" of distinct objects. + * So values in a set object are not in a sorted way. Even the values 2, 5, 10 and 20 aren't inserted in sorted manner. + + ```py + >>> st = set() + >>> st.add(5) + >>> st.add(10) + >>> print(st) + >>> st.add(20) + >>> print(st) + >>> st.add(2) + >>> print(st) + >>> st.add(345678) + >>> print(st) + ``` + **Output:** + ```py + {10, 5} + {10, 20, 5} + {10, 2, 20, 5} + {2, 5, 10, 345678, 20} + ``` + **Note:** This is why when we want to iterate on the distinct elements of a sequence in sorted way, we iterate on the list obtained from sorted(st), not on the set itself. --- ### ▶ Teleportation *