与python list有关的操作

尤其注意：append,+,extend的区别

Method/Function	Description	Example Input	Resulting List/Output
append(x)	Adds a single element x to the end of the list.	[1, 2, 3].append(4)	[1, 2, 3, 4]
extend(iter)	Adds all elements of an iterable iter to the end of the list.	[1, 2, 3].extend([4, 5])	[1, 2, 3, 4, 5]
insert(i, x)	Inserts element x at index i.	[1, 2, 3].insert(1, 10)	[1, 10, 2, 3]
remove(x)	Removes the first occurrence of element x.	[1, 2, 3, 2].remove(2)	[1, 3, 2]
pop([i])	Removes and returns the element at index i (defaults to the last element).	[1, 2, 3].pop(1)	2 (list becomes [1, 3])
clear()	Removes all elements from the list.	[1, 2, 3].clear()	[]
index(x)	Returns the index of the first occurrence of element x.	[1, 2, 3, 2].index(2)	1
count(x)	Returns the number of occurrences of element x.	[1, 2, 2, 3].count(2)	2
sort()	Sorts the list in ascending order (in-place).	[3, 1, 2].sort()	[1, 2, 3]
reverse()	Reverses the elements of the list in-place.	[1, 2, 3].reverse()	[3, 2, 1]
copy()	Returns a shallow copy of the list.	[1, 2, 3].copy()	[1, 2, 3] (new list)
len(list)	Returns the number of elements in the list.	len([1, 2, 3])	3
sum(list)	Returns the sum of all elements in the list.	sum([1, 2, 3])	6
min(list)	Returns the smallest element in the list.	min([1, 2, 3])	1
max(list)	Returns the largest element in the list.	max([1, 2, 3])	3
sorted(list)	Returns a new sorted list (does not modify the original).	sorted([3, 1, 2])	[1, 2, 3]
reversed(list)	Returns a reverse iterator (use list() to convert to a list).	list(reversed([1, 2, 3]))	[3, 2, 1]
list(iter)	Converts an iterable (e.g., tuple, string) to a list.	list((1, 2, 3))	[1, 2, 3]
del list[i]	Deletes the element at index i.	del [1, 2, 3][1]	[1, 3]
list[i:j]	Slices the list from index i to j-1.	[1, 2, 3, 4][1:3]	[2, 3]
list + list	Concatenates two lists.	[1, 2] + [3, 4]	[1, 2, 3, 4]
list * n	Repeats the list n times.	[1, 2] * 2	[1, 2, 1, 2]

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