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python list methods

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Grumpy Gemsbok answered on March 3, 2020 Popularity 9/10 Helpfulness 2/10

answer python list methods

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related List methods Python

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python list methods

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li = [1, 2, 3, 4]
li[start:end:step]
li[0]     # Return first element => 1
li[-1]    # Return last element => 4
li[1:3]   # Return list from index 1 to 3 => [2, 3]
li[::2]   # Return list selecting every second entry => [1, 3]
li[::-1]  # Return list in reverse order => [4, 3, 2, 1]

del li[2] # li is now [1, 2, 4]
1 in li 

list.append(x) # append x to end of list
list.extend(iterable) # append all elements of iterable to list
list.insert(i, x) # insert x at index i
list.remove(x) # remove first occurance of x from list
list.pop([i]) # pop element at index i (defaults to end of list)
list.clear() # delete all elements from the list
list.index(x[, start[, end]]) # return index of element x
list.count(x) # return number of occurances of x in list
list.reverse() # reverse elements of list in-place (no return)
list.sort(key=None, reverse=False) # sort list in-place
list.copy() # => shallow copy of the list
list.get(key, default=None)
dictionary.keys()
dictionary.values()
dictionary.items()

len(li)  # => 3
zip(*iterables) # => iterator of tuples, pairing elements from iterables
filter(function, iterable) # => iterator containing elements where function returns True
map(function, iterable) # => iterator with result of function for each element
sorted(iterable, key=None, reverse=False) # => sorted list
sum(iterable, start=0) # => sum of all elements in iterable
min(iterable) # => minimum element in iterable
max(iterable) # => maximum element in iterable
len(iterable) # => number of elements in  iterable
enumerate(iterable, start=0) # => iterator of tuples with generated indices and values from iterable
reversed(sequence) # => iterator with reverse order
any(iterable) # => True if any element in iterable is True else False
all(iterable) # => True if all elements in iterable are True else False


set1 == set2 # Equality - Checks if two sets contain the same elements
set1 != set2 # Inequality - Checks if two sets do not contain the same elements
set1 <= set2 # Subset - Checks if one set is a subset of another (including  equal)
set1 >= set2 # Superset - Checks if one set is a superset of another (including equal)

range_(start, stop, step_)
list(range(10, -2, -3)) # => [10, 7, 4, 1]

my_list = [x for x in iterable]
my_tuple = tuple(x for x in iterable)
my_set = {x for x in iterable}
my_dict = {key: value for key, value in iterable}

a, b, c = (1, 2, 3)  # a is now 1, b is now 2 and c is now 3
a, *b, c = (1, 2, 3, 4)  # a is now 1, b is now [2, 3] and c is now 4
d, e, f = 4, 5, 6  # tuple 4, 5, 6 is unpacked into variables d, e and f
e, d = d, e  # d is now 5 and e is now 4

Popularity 9/10 Helpfulness 2/10 Language python

Source: Grepper

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Contributed on Jun 02 2023

Grumpy Gemsbok

0 Answers Avg Quality 2/10

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list.append(x) # append x to end of list
list.extend(iterable) # append all elements of iterable to list
list.insert(i, x) # insert x at index i
list.remove(x) # remove first occurance of x from list
list.pop([i]) # pop element at index i (defaults to end of list)
list.clear() # delete all elements from the list
list.index(x[, start[, end]]) # return index of element x
list.count(x) # return number of occurances of x in list
list.reverse() # reverse elements of list in-place (no return)
list.sort(key=None, reverse=False) # sort list in-place
list.copy() # return a shallow copy of the list

Popularity 10/10 Helpfulness 6/10 Language python

Source: docs.python.org

Tags: list

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Contributed on Mar 03 2020

Caleb McNevin

0 Answers Avg Quality 2/10

List methods Python

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## Python has a set of built-in methods that you can use on lists.
append()  # Adds an element at the end of the list
clear()  # Removes all the elements from the list
copy()  # Returns a copy of the list
count()  # Returns the number of elements with the specified value
extend()  # Add the elements of a list (or any iterable), to the end of the current list
index()  # Returns the index of the first element with the specified value
insert()  # Adds an element at the specified position
pop()  # Removes the element at the specified position
remove()  # Removes the item with the specified value
reverse()  # Reverses the order of the list
sort()  # Sorts the list
## Happy coding :)

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: list

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Contributed on Apr 15 2022

CoderHomie

0 Answers Avg Quality 2/10

list functions

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list.append()
list.clear()
list.copy()	
list.count()
list.extend()
list.index()     
list.insert()	
list.pop()	
list.remove()	
list.append()	
list.clear()	
list.copy()	
list.count()	
list.extend()	
list.index()	
list.insert()	
list.pop()	
list.remove()	
list.sort()	
list(sorted(list))    
list(reverse(x))	# x=string, tuple, range, list

Popularity 10/10 Helpfulness 3/10 Language python

Source: www.codegrepper.com

Tags: list

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Contributed on Jun 05 2021

JJSSEEXX

0 Answers Avg Quality 2/10

list methods in python

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l1 = [1, 8, 7, 2, 21, 15]

 l1.sort() # sorts the list
  print(l1)

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: list

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Contributed on Jan 12 2022

Coding boy Hasya

0 Answers Avg Quality 2/10

python list methods

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