10 Essential Python List Methods

Python List Methods Cheatsheet

A complete guide to Python list operations and methods.

List Methods

Method	Description	Example
append(x)	Add to end	lst.append(5)
extend(iterable)	Add all items	lst.extend([1,2,3])
insert(i, x)	Insert at index	lst.insert(0, "first")
remove(x)	Remove first occurrence	lst.remove(5)
pop(i)	Remove by index	lst.pop(-1)
index(x)	Find index	lst.index(5)
count(x)	Count occurrences	lst.count(5)
sort()	Sort in-place	lst.sort(reverse=True)
reverse()	Reverse in-place	lst.reverse()
copy()	Shallow copy	new = lst.copy()
clear()	Remove all	lst.clear()

Code Examples

# List operations
numbers = [3, 1, 4, 1, 5, 9, 2, 6]

# Sorting
sorted_nums = sorted(numbers)            # [1, 1, 2, 3, 4, 5, 6, 9]
sorted_desc = sorted(numbers, reverse=True)

# List comprehension
squares = [x**2 for x in numbers]
evens = [x for x in numbers if x % 2 == 0]

# Slicing
first_3 = numbers[:3]    # [3, 1, 4]
last_3 = numbers[-3:]    # [2, 6]  (wait, let me recalculate)
reversed_lst = numbers[::-1]

# Useful functions
total = sum(numbers)     # 31
maximum = max(numbers)   # 9
minimum = min(numbers)   # 1
unique = list(set(numbers))  # [1, 2, 3, 4, 5, 6, 9]

# Flattening nested lists
nested = [[1, 2], [3, 4], [5, 6]]
flat = [x for sublist in nested for x in sublist]
# [1, 2, 3, 4, 5, 6]

# zip and enumerate
for i, val in enumerate(numbers[:3]):
    print(f"Index {i}: {val}")

for a, b in zip([1,2,3], ["a","b","c"]):
    print(f"{a}: {b}")

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