Answers for "python list methods"

list functions

list.append()
list.clear()
list.copy()	
list.count()
list.extend()
list.index()     
list.insert()	
list.pop()	
list.remove()	
list.reverse()	
list.append()	
list.clear()	
list.copy()	
list.count()	
list.extend()	
list.index()	
list.insert()	
list.pop()	
list.remove()	
list.reverse()	
list.sort()	
sorted(list)

list methods

my_list = ["banana", "cherry", "apple"]

# len() : get the number of elements in a list
print("Length:", len(my_list))

# append() : adds an element to the end of the list
my_list.append("orange")

# insert() : adds an element at the specified position
my_list.insert(1, "blueberry")
print(my_list)

# pop() : removes and returns the item at the given position, default is the last item
item = my_list.pop()
print("Popped item: ", item)

# remove() : removes an item from the list
my_list.remove("cherry") # Value error if not in the list
print(my_list)

# clear() : removes all items from the list
my_list.clear()
print(my_list)

# reverse() : reverse the items
my_list = ["banana", "cherry", "apple"]
my_list.reverse()
print('Reversed: ', my_list)

# sort() : sort items in ascending order
my_list.sort()
print('Sorted: ', my_list)

# use sorted() to get a new list, and leave the original unaffected.
# sorted() works on any iterable type, not just lists
my_list = ["banana", "cherry", "apple"]
new_list = sorted(my_list)

# create list with repeated elements
list_with_zeros = [0] * 5
print(list_with_zeros)

# concatenation
list_concat = list_with_zeros + my_list
print(list_concat)

# convert string to list
string_to_list = list('Hello')
print(string_to_list)

python list functions

# Method	Description
# 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 first item with the specified value
# reverse()	Reverses the order of the list
# sort()	Sorts the list
# Note: Python does not have built-in support for Arrays, but Py# Method	Description
# 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 first item with the specified value
# reverse()	Reverses the order of the list
# sort()	Sorts the list

methods in python

#Objects can also contain methods. Methods in objects are functions that belong to the object.
#Let us create a method in the Person class:

class Person:
  
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def myfunc(self): # This is a method
    print("Hello my name is " + self.name)

p1 = Person("John", 36)
p1.myfunc()

Python list functions

>>> fruits = ['orange', 'apple', 'pear', 'banana', 'kiwi', 'apple', 'banana']
>>> fruits.count('apple')
2
>>> fruits.count('tangerine')
0
>>> fruits.index('banana')
3
>>> fruits.index('banana', 4)  # Find next banana starting a position 4
6
>>> fruits.reverse()
>>> fruits
['banana', 'apple', 'kiwi', 'banana', 'pear', 'apple', 'orange']
>>> fruits.append('grape')
>>> fruits
['banana', 'apple', 'kiwi', 'banana', 'pear', 'apple', 'orange', 'grape']
>>> fruits.sort()
>>> fruits
['apple', 'apple', 'banana', 'banana', 'grape', 'kiwi', 'orange', 'pear']
>>> fruits.pop()
'pear'

list methods python

list.append(x)
#Add an item to the end of the list. Equivalent to a[len(a):] = [x].

list.extend(iterable)
#Extend the list by appending all the items from the iterable. Equivalent to a[len(a):] = iterable.

list.insert(i, x)
#Insert an item at a given position. The first argument is the index of the element before which to insert, so a.insert(0, x) inserts at the front of the list, and a.insert(len(a), x) is equivalent to a.append(x).

list.remove(x)
#Remove the first item from the list whose value is equal to x. It raises a ValueError if there is no such item.

list.pop([i])
#Remove the item at the given position in the list, and return it. If no index is specified, a.pop() removes and returns the last item in the list.