list py

#Creating lists my_list = ['foo', 4, 5, 'bar', 0.4] my_nested_list = ['foobar', ['baz', 'qux'], [0]] #Accessing list values my_list[2] # 5 my_list[-1] # 0.4 my_list[:2] # ['foo', 4, 5] my_nested_list[2] # ['baz', 'quz'] my_nested_list[-1] # [0] my_nested_list[1][1] # 'qux' #Modifying lists my_list.append(x) # append x to end of list my_list.extend(iterable) # append all elements of iterable to list my_list.insert(i, x) # insert x at index i my_list.remove(x) # remove first occurance of x from list my_list.pop([i]) # pop element at index i (defaults to end of list) my_list.clear() # delete all elements from the list my_list.index(x[, start[, end]]) # return index of element x my_list.count(x) # return number of occurances of x in list my_list.reverse() # reverse elements of list in-place (no return) my_list.sort(key=None, reverse=False) # sort list in-place my_list.copy() # return a shallow copy of the list

# list() converts other datatypes into lists # e.g. text = 'Python' # convert string to list text_list = list(text) print(text_list) # check type of text_list print(type(text_list)) # Output: ['P', 'y', 't', 'h', 'o', 'n'] # <class 'list'>

#Creating lists my_list = [1, "Hello", 3.4, 0, "World"] my_nested_list = [['Hello', 'World'],[47,39]] #Accessing lists my_list[1] # Hello my_list[-2] # 0 my_list[:3] # [1, "Hello", 3.4] my_nested_list[1] #[47,39] my_nested_list[0][1] # World

# Create list List = list() List = [] List = [0, "any data type can be added to list", 25.12, ("Even tuples"), {"Dictionaries": "can also be added"}, ["can", "be nested"]] # Accessing items List[1] # 0 List[-1] # ["can", "be nested"] # Operations List.append(4) # adds 4 to end List.pop(n=-1) # removes element from nth position List.count(25.12) # 1

python lists

#Creating your lists
my_list = ['foo', 4, 5, 'bar', 0.4]
my_nested_list = ['foobar', ['baz', 'qux'], [0]]

#Accessing list values
my_list[2] # 5
my_list[-1] # 0.4
my_list[:2] # ['foo', 4, 5]
my_nested_list[2] # ['baz', 'quz']
my_nested_list[-1] # [0]
my_nested_list[1][1] # 'qux'

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

Posted by: Guest on March-04-2021

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