What are the different Python List Methods?

python @ Freshers.in

In Python Lists are used to store multiple items in a single variable. There are multiple built-in methods that you can use on lists or arrays in Python. Lists are one of 4 built-in data types in Python Programming. A list in Python  is created by placing all the items inside square brackets [] , and is separated by commas.

# append()  This method will adds an element at the end of the list
us_states = ['New York', 'New Jersey', 'Delaware']
us_states.append('Virginia')
print(us_states)
#['New York', 'New Jersey', 'Delaware', 'Virginia']
us_west_cost_states = ['Los Angeles','San Francisco','Portland']
us_states.append(us_west_cost_states)
print(us_states)
#['New York', 'New Jersey', 'Delaware', 'Virginia', ['Los Angeles', 'San Francisco', 'Portland']]
# copy()   This method will returns a copy of the list
us_states = ['New York', 'New Jersey', 'Delaware']
us_states_cp = us_states.copy()
print(us_states_cp)
#['New York', 'New Jersey', 'Delaware', 'Virginia', ['Los Angeles', 'San Francisco', 'Portland']]
print(id(us_states))
print(id(us_states_cp))
# count()   This method will returns the number of elements with the specified value
us_states = ['New York', 'New Jersey', 'Delaware']
print(us_states.count('New York'))
#1
# extend()  Add the elements of a list (or any iterable), to the end of the current list
us_states = ['New York', 'New Jersey', 'Delaware']
us_west_cost_states = ['Los Angeles','San Francisco','Portland']
us_states.extend(us_west_cost_states)
print(us_states)
# index()   This method will returns the index of the first element with the specified value
us_states = ['New York', 'New Jersey', 'Delaware']
idx = us_states.index('Delaware')
print(idx)
# insert()  This method will adds an element at the specified position
us_states = ['New York', 'New Jersey', 'Delaware']
s_states.insert(0,'Virginia')
print(us_states)
# pop() This method will removes the element at the specified position
us_states = ['New York', 'New Jersey', 'Delaware']
var_pop = us_states.pop()
print(var_pop)
#remove()   This method will removes the first item with the specified value
us_states = ['New York', 'New Jersey', 'Delaware']
us_states.remove('New Jersey')
print(us_states)
#['New York', 'Delaware']
#reverse()  This method will reverses the order of the list
us_states = ['New York', 'New Jersey', 'Delaware']
us_states.reverse()
print(us_states)
# clear()   This method will removes all the elements from the list
us_states = ['New York', 'New Jersey', 'Delaware']
us_states.clear()
print(us_states)
# []
# sort() Sorts the list
us_states = [ 'New Jersey','Delaware', 'New York']
us_states.sort()
print(us_states)
#['Delaware', 'New Jersey', 'New York']
Author: user

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