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Arrays.py
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Arrays.py
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"""
File: arrays.py
An Array is a restricted list whose clients can use
only [], len, iter, and str.
To instantiate, use
<variable> = array(<capacity>, <optional fill value>)
The fill value is None by default.
"""
class Array(object):
"""Represents an array."""
def __init__(self, capacity, fillValue = None):
"""Capacity is the static size of the array.
fillValue is placed at each position."""
self._items = list()
for count in xrange(capacity):
self._items.append(fillValue)
def __len__(self):
"""-> The capacity of the array."""
return len(self._items)
def __str__(self):
"""-> The string representation of the array."""
return str(self._items)
def __iter__(self):
"""Supports traversal with a for loop."""
return iter(self._items)
def __getitem__(self, index):
"""Subscript operator for access at index."""
return self._items[index]
def __setitem__(self, index, newItem):
"""Subscript operator for replacement at index."""
self._items[index] = newItem