4.8: List (container)

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↵

Figure \(\PageIndex{1}\):The variable molar_Mass is a list. This image was taken from an IDE that displayed strings in red and floating numbers in green (Belford CC0.0)

Overview

Use Brackets
- Can have multiple types of objects
- commas separate objects
Lists are ordered
- Support Indexing and Slicing
Lists can be nested
Lists are mutable (can be modified)
Lists are an object class with methods

Methods

append
count
extend
insert
pop
remove
reverse
sort

molar_Mass=['hydrogen',1.00784,'helium',4.002602,'lithium', 6.941, 'beryllium', 9.012182]
print('List Created')

Hello world!

len(molar_Mass)

        hello world

molar_Mass=['hydrogen',1.00784,'helium',4.002602,'lithium', 6.941, 'beryllium', 9.012182]
print(f"There are {len(molar_Mass)} items in the list molar_Mass")

Hello world!

print every other item starting with first item (index number = 0)

molar_Mass[0::2]

        hello world

print every other item starting with first item (index number = 0) with a range of up to 4 (it does not print item with index =4)

molar_Mass[0:4:2]

        hello world

Print print every other item starting with second item (index number = 1)

molar_Mass[1::2]

        hello world

Create three lists

name_halogen=['fluorine', 'chlorine', 'bromine', 'iodine', 'astatine','tennessine']
z_halogen=[9,17,35,53,85,117]
a_halogen=[18.99840316,35.45,79.90,126.9045,209.98715,294.211]
print('List Created')

Hello world!

Print two of the lists, note they are printed as two separate lists

print(name_halogen,z_halogen)

        hello world

Combine the two lists into one and print it

print(name_halogen+a_halogen)

        hello world

create a new list and print it

halogen_masses=name_halogen+a_halogen
print(halogen_masses)

        hello world

print(name_halogen)

Hello world!

popped_halogen=name_halogen.pop()
print(name_halogen)
print(popped_halogen)

Hello world!

name_halogen.append(popped_halogen)
print(name_halogen)

        hello world

remove_bromine=name_halogen.pop(2)
print(name_halogen)
print(remove_bromine)
name_halogen.insert(2,remove_bromine)
print(name_halogen)

        hello world

halogen=[name_halogen, z_halogen,a_halogen]
print(f'{halogen}\n')

print(f'{halogen[0]}\n')
print(f'{halogen[0:][1]}\n')
print(f'{halogen[0:][0]}\n')
print(f'{halogen[0][0:]}\n')
print(f'{halogen[2][0]}\n')

        hello world

random_list=[22,41,16,444,224]
print(random_list)
random_list.reverse()
print(random_list)
random_list.sort()
print(random_list)

Hello world!

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