Python · Theory

Python List Methods

Theory

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Python List Methods

Most list methods change the same list. append(x) adds one item at the end. extend(iterable) adds many. insert(i, x) puts x at index i. remove(value) deletes the first match. pop() takes the last (or pop(i) that index). clear() empties the list. sort() and reverse() edit in place.

append vs extend is the viva. names.append(["Neha"]) nests a list. names.extend(["Neha"]) adds the string Neha. sorted(names) returns a new list; names.sort() changes names. count(x) and index(x) only read. copy() is a shallow copy.

Python List Methods — output — [70, 80, 90] then 90. sort is in place. pop removes last.

Diagram

index →  0       1       2
  list  → [Asha,  Ravi,  Neha]

Exam tip

append([1,2]) vs extend([1,2]).

Example

# List methods
marks = [70, 90, 80]
marks.sort()
print(marks)
print(marks.pop())

Python List Methods — output: [70, 80, 90] then 90. sort is in place. pop removes last.

Short notes

DefMost methods change the list.
Diffappend vs extend.
Trapsort vs sorted.

Python · Theory

Python List Methods

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Theory

31/268

Python List Methods

Python List Methods — output — [70, 80, 90] then 90. sort is in place. pop removes last.

Diagram

index →  0       1       2
  list  → [Asha,  Ravi,  Neha]

Exam tip

append([1,2]) vs extend([1,2]).

Example

# List methods
marks = [70, 90, 80]
marks.sort()
print(marks)
print(marks.pop())

Python List Methods — output: [70, 80, 90] then 90. sort is in place. pop removes last.

Short notes

DefMost methods change the list.
Diffappend vs extend.
Trapsort vs sorted.

Python List Methods

Example

Short notes

Questions

Python List Methods

Example

Short notes

Questions