self Keyword

1class Counter:
2    def __init__(self):
3        self.count = 0
4
5    def increment(self):
6        self.count += 1
7        return self  # Return self for chaining
8
9    def reset(self):
10        self.count = 0
11        return self
12
13# Method chaining
14c = Counter()
15c.increment().increment().increment()
16print(c.count)  # 3
17
18# self is just convention (can use any name)
19class Example:
20    def method(this):  # Works but don't do this!
21        return this
22
23# self is passed automatically
24c.increment()      # Python passes c as self
25Counter.increment(c)  # Equivalent explicit call