Revisions to What is the difference between Python's list methods append and extend?

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edit approved Sep 12, 2019 at 12:02

Gavriel Cohen

4.7k
38
42

An English dictionary definedefines the words append and extend as:

append: add (something) to the end of a written document.
extend: make larger. Enlarge or expand

With that knowledge, now let's understand

The difference between append and extend

append:

Appends any Python object as-is to the end of the list (i.e. as a lastthe last element in the list).
The resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set, etc.)

extend:

Accepts any iterable as its argument and makes the list larger.
The resulting list is always one dimensional-dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable).

Similarity between append and extend

Both takestake exactly one argument.
Both modify the list in-place.
As a result, both returns None.

Example

lis = [1, 2, 3]

# 'extend' is equivalent to this
lis = lis + list(iterable)

# 'append' simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
lislist.append(object)

An English dictionary define the words append and extend as:

append: add (something) to the end of a written document.
extend: make larger. Enlarge or expand

With that knowledge, now let's understand

The difference between append and extend

append:

Appends any Python object as-is to the end of the list (i.e. as a last element in the list).
The resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set, etc.)

extend:

Accepts any iterable as its argument and makes the list larger.
The resulting list is always one dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable).

Similarity between append and extend

Both takes exactly one argument.
Both modify the list in-place.
As a result, both returns None.

Example

lis = [1, 2, 3]

# 'extend' is equivalent to this
lis = lis + list(iterable)

# 'append' simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
lis.append(object)

An English dictionary defines the words append and extend as:

append: add (something) to the end of a written document.
extend: make larger. Enlarge or expand

With that knowledge, now let's understand

The difference between append and extend

append:

Appends any Python object as-is to the end of the list (i.e. as a the last element in the list).
The resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set, etc.)

extend:

Accepts any iterable as its argument and makes the list larger.
The resulting list is always one-dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable).

Similarity between append and extend

Both take exactly one argument.
Both modify the list in-place.
As a result, both returns None.

Example

lis = [1, 2, 3]

# 'extend' is equivalent to this
lis = lis + list(iterable)

# 'append' simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
list.append(object)

Active reading.

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edited Jun 5, 2018 at 13:06

Peter Mortensen

31.1k
22
111
134

An English dictionary define the words append and extend as:

append: add (something) to the end of a written document.

extend: make larger. enlargeEnlarge or expand

With that knowledge, now let's understand

differenceThe difference between append and extend

append:

appendsAppends any Python object as-is to the end of the list (i.e. as a last element in the list).
The resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set, etc.)

extend:

acceptsAccepts any iterable as its argument and makes the list larger.
The resulting list is always one dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable).

similaritySimilarity between append and extend

Both takes exactly one argument.
Both modify the list in-place.
As a result, both returns None.

Example

lis = [1, 2, 3]

# extend'extend' is equivalent to this
lis = lis + list(iterable)

# append'append' simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
lis.append(object)

English dictionary define the words append and extend as:

append: add (something) to the end of a written document.
extend: make larger. enlarge or expand

With that knowledge, now let's understand

difference between append and extend

append:

appends any Python object as-is to the end of the list (i.e. as a last element in the list).
resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set etc.)

extend:

accepts any iterable as its argument and makes the list larger
resulting list is always one dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable)

similarity between append and extend

Both takes exactly one argument
Both modify the list in-place
As a result, both returns None

Example

lis = [1, 2, 3]

# extend is equivalent to this
lis = lis + list(iterable)

# append simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
lis.append(object)

An English dictionary define the words append and extend as:

append: add (something) to the end of a written document.
extend: make larger. Enlarge or expand

With that knowledge, now let's understand

The difference between append and extend

append:

Appends any Python object as-is to the end of the list (i.e. as a last element in the list).
The resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set, etc.)

extend:

Accepts any iterable as its argument and makes the list larger.
The resulting list is always one dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable).

Similarity between append and extend

Both takes exactly one argument.
Both modify the list in-place.
As a result, both returns None.

Example

lis = [1, 2, 3]

# 'extend' is equivalent to this
lis = lis + list(iterable)

# 'append' simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
lis.append(object)

Source Link

answered Dec 30, 2017 at 18:38

kmario23

62.3k
17
175
160

English dictionary define the words append and extend as:

append: add (something) to the end of a written document.
extend: make larger. enlarge or expand

With that knowledge, now let's understand

difference between append and extend

append:

appends any Python object as-is to the end of the list (i.e. as a last element in the list).
resulting list may be nested and contain heterogeneous elements (i.e. list, string, tuple, dictionary, set etc.)

extend:

accepts any iterable as its argument and makes the list larger
resulting list is always one dimensional list (i.e. no nesting) and it may contain heterogeneous elements in it (e.g. characters, integers, float) as a result of applying list(iterable)

similarity between append and extend

Both takes exactly one argument
Both modify the list in-place
As a result, both returns None

Example

lis = [1, 2, 3]

# extend is equivalent to this
lis = lis + list(iterable)

# append simply appends its argument as the last element to the list
# as long as the argument is a valid Python object
lis.append(object)

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