[Python]基本操作

 

#!/usr/local/bin/python3
#coding=UTF-8
'''''
Created on 2011-2-25
@author: Jacky
'''
import sys

#逻辑与运算符and:x and y 如果x为false则返回x,如果x为true则返回y
#False
print("false and true:",False and True)
#False
print("true and false:",True and False)
#True
print("true and true:",True and True)
#0
print("0 and 1:",0 and 1)
#0
print("1 and 0:",1 and 0)
#1
print("1 and 1:",1 and 1)
#[]
print("[] and [1]:",[] and [1])
#[]
print("[1] and []:",[1] and [])
#[1]
print("[1] and [1]:",[1] and [1])
#逻辑或运算符or:x or y 如果x为true则返回x,如果x为false则返回y
#True
print("false or true:",False or True)
#True
print("true or false:",True or False)
#True
print("true or true:",True or True)
#1
print("0 or 1:",0 or 1)
#1
print("1 or 0:",1 or 0)
#1
print("1 or 1:",1 or 1)
#[1]
print("[] or [1]:",[] or [1])
#[1]
print("[1] or []:",[1] or [])
#[1]
print("[1] or [1]:",[1] or [1])

#逻辑非运算符not:not x 如果x为true则返回false,如果x为false则返回true
#not 1 ==> False
#not 0 ==> True

list1 = [0,1,2,3,4]
list2 = [0,1,2,3,4]
print("list1 is:",list1)
print("list2 is:",list2)
print()

#获取对象的id
print("the id of list1 is:",id(list1))
print("the id of list2 is:",id(list2))
print()

#获取对象的类型
print("the type of list1 is:",type(list1))
print("the type of list2 is:",type(list2))
print()

#获取对象的大小
print("the size of list1 is:",sys.getsizeof(list1))
print("the size of list2 is:",sys.getsizeof(list2))
print()

#判断两个对象引用是否相同,比较的是id,默认调用id()方法
print("list1 and list2 is same:",list1 is list2)
print()

#判断两个对象值是否相同,比较的是value,默认调用__eq__()方法
print("list1 and list2 is equal:",list1 == list2)
print()

#列表解析
print("list1 comprehension:",[2*x for x in list1])
print("list2 comprehension:",[3*x for x in list2])
print()

#列表切片
print("list1[1:4] is:",list1[1:4])
print("list2[1:4] is:",list2[1:4])
print()