deque.popleft()
deque.popleft() is a Python method in the Collections Module category. Removes and returns the leftmost element. Raises IndexError if empty. The syntax is deque.popleft(). Returns: Leftmost element. A typical example: d = deque([1,2,3])
d.popleft() # 1. 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.extend(), deque.extendleft(). This page is part of the free Python Reference documentation covering 978+ functions, methods, and modules with examples and parameter details.