Xuefeng Liao Website-Learn Python Basics (ii)

1. List

"""one of the data types built into Python is the list: lists. A list is an ordered set of elements that can be added and removed at any time. """Classmates= ['Michael','Bob','Mary']Print('Classmates', classmates)Print('len (classmates) =', Len (classmates))Print('classmates[0]=', Classmates[0])Print('classmates[1]=', classmates[1])Print('classmates[-1]=', classmates[-1])Print('classmates[-2]=', classmates[-2])Print('classmates[-3]=', classmates[-3]) Classmates.append ('Mike')#add end of list elementPrint('classmates1', classmates) Classmates.insert (1,'Jack')#element is inserted at the specified locationPrint('Classmates2', classmates) classmates.pop ()#Delete List End elementPrint('Classmates3', classmates) Classmates.pop (1)#deletes the element at the specified positionPrint('Classmates4', classmates) classmates[1] ='Sarah'           #specify location to replace other elementsPrint('classmates5', classmates)

2. Tuple

"""Another ordered list is called a tuple: a tuple. Tuple and list are very similar, but a tuple cannot be modified once initialized"""Classmates= ('Michael','Bob','Tracy')Print('classmates =', classmates)Print('classmates[0]=', Classmates[0])Print('classmates[1]=', classmates[1])Print('classmates[2]=', classmates[2])Print('Classmates[-1]', classmates[-1])#classmates[0] = ' Adam ' # cannot modify element#print (' classmates1 ', classmates)T= (1, 2)#defining a tuple element must determinePrint('t1=', T) t= ()#define an empty tuplePrint('t2=', T) t= (1)#This is 1 numbers, and the definition is not just one element.Print('t3=', T) t= (1,)#define only one elementPrint('t4=', T) t= ('a','b', ['A','B'])#"variable" tuple:T[2][0] ='X't[2][1] ='Y'Print('T5', T)

Xuefeng Liao Website-Learn Python Basics (ii)