dumb_array.py

### current bpython session - file will be reevaluated, ### lines will not be run
class Mapping(object):
    def __init__(self):
        self.data = []
    def add_key_value_pair(self, key, value):
        self.data.append([key, value])
    def get_value(self, key):
        for k, value in self.data:
            if k == key:
                return value
        raise KeyError
    def remove_key(self, key):
        for i, (k, v) in enumerate(self.data):
            if k == key:
                break
        else:
            raise KeyError
        self.data.pop(i)

m = Mapping()
m.add_key_value_pair('hello', 10)
m.get_value('hello')
### 10
m.remove_key('hello')
m.remove_key('hello')
### Traceback (most recent call last):
###   File "<input>", line 1, in <module>
###   File "<input>", line 16, in remove_key
### KeyError


###