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| 1 | +# **`sort()`** |
| 2 | + |
| 3 | +* sort() method = used with lists |
| 4 | +* sort() functions = used with iterables |
| 5 | + |
| 6 | +```py |
| 7 | +students = ['spongebob', 'sandy', 'patrick', 'squidward', 'mr.krab'] |
| 8 | +students.sort() |
| 9 | +for i in students: |
| 10 | + print(i) |
| 11 | +## to reverse |
| 12 | +students.sort(reverse=True) |
| 13 | +``` |
| 14 | + |
| 15 | +if we use: |
| 16 | +`students = ('spongebob', 'sandy', 'patrick', 'squidward', 'mr.krab')` |
| 17 | +It will throw an error of AttributeError: 'tuple' object has no attribute 'sort' |
| 18 | +To sort this we need the built in functions: |
| 19 | + |
| 20 | +```py |
| 21 | +sorted_students = sorted(students) |
| 22 | +for i in sorted_students: |
| 23 | + print(i) |
| 24 | +``` |
| 25 | + |
| 26 | +To reverse it we will use :- `sorted(students, reverse = True)` |
| 27 | + |
| 28 | +Suppose we have list of tuples: |
| 29 | +```py |
| 30 | +students = [("Squidward", "F", 60), ("Sandy", "A", 33), ("Patrick", "D", 36),("Spongebob", "B", 20), ("Mr. Krab", "C", 78)] |
| 31 | +grades = lambda grades:grades[1] |
| 32 | +ages = lambda ages:ages[2] |
| 33 | +students.sort(key = grades) |
| 34 | +for i in students: |
| 35 | + print(i) |
| 36 | + |
| 37 | +students.sort(key = grades, reverse = True) |
| 38 | +``` |
| 39 | + |
| 40 | +Now, suppose we have the list of the list:- |
| 41 | + |
| 42 | +```py |
| 43 | +students = (("Squidward", "F", 60), ("Sandy", "A", 33), ("Patrick", "D", 36),("Spongebob", "B", 20), ("Mr. Krab", "C", 78)) |
| 44 | +ages = lambda ages:ages[2] |
| 45 | +sorted_students = sorted(students, key=ages) |
| 46 | +for i in sorted_students: |
| 47 | + print(i) |
| 48 | +``` |
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