Method signature:
append(object)
Return value:
None
Overview:
- The append() method adds an element to the right side of a deque.
- When an element is appended at the right side of an already full fixed length deque an element is removed from the left side.
Example 1:
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import collections
gradeTuple = ("good", "better", "best")
# Create a deque from a tuple of strings gradeDeque = collections.deque(gradeTuple) print("All Grades:") print(gradeDeque)
# Add a new grade print("All Grades - Updated:") gradeDeque.append("awesome") print(gradeDeque) |
Output:
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All Grades: deque(['good', 'better', 'best']) All Grades - Updated: deque(['good', 'better', 'best', 'awesome']) |
Example 2:
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import collections
# Create an empty deque d1 = collections.deque(maxlen=3) print(d1)
d1.append("Small") d1.append("Medium") d1.append("Large")
# After filling the deque to maximum length print("Deque at maximum length...") print("Deque Length:%d"%(len(d1))) print(d1)
d1.append("Extra Large") print("Deque after adding a 4th elem to the right side:") print("Deque Length:%d"%(len(d1))) print(d1) |
Output:
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deque([], maxlen=3) Deque at maximum length... Deque Length:3 deque(['Small', 'Medium', 'Large'], maxlen=3) Deque after adding a 4th elem to the right side: Deque Length:3 deque(['Medium', 'Large', 'Extra Large'], maxlen=3) |