deque.count()
deque.count() is a Python method in the Collections Module category. Returns the number of occurrences of x in the deque. The syntax is deque.count(x). Parameters: x — value to count. Returns: Integer. A typical example: d = deque([1,2,2,3]); d.count(2) # 2. A close sibling is collections.deque(), which returns a double-ended queue (deque) with efficient O(1) appends/pops from both ends. A close sibling is deque.append(), which adds x to the right side of the deque. A close sibling is deque.appendleft(), which adds x to the left side of the deque. A close sibling is deque.pop(), which removes and returns the rightmost element. Raises IndexError if empty. More about this category: Specialized container datatypes — deque, Counter, defaultdict, namedtuple, OrderedDict. For a broader walkthrough, read the Collections Module guide. Related Collections Module entries: collections.deque(), deque.append(), deque.appendleft(), deque.pop(), deque.popleft(), deque.extend(). This page is part of the free Python Reference documentation covering 978+ functions, methods, and modules with examples and parameter details.