I knew when python's list append element,the element is appended to tail. I tried to output the element of the list, why the element's address is out of order? Please help me out,thanks!
list = []
list.append(2)
list.append(10)
list.append(3)
print('--append--')
for i in list:
print('i:{}, id:{}'.format(i,id(i)))
the output is:
--append--
i:2, id:140711739437936
i:10, id:140711739438192
i:3, id:140711739437968
The id() function returns a unique id for the specified object.
You need to use the index of the list
list = []
list.append(2)
list.append(10)
list.append(3)
print('--append--')
for i in list:
print('i:{}, id:{}'.format(i,list.index(i))) # replace id with list.index
id() returns identity (unique integer) of an object...
a=3
print(id(3)) #9752224
You can use this
list = []
list.append(2)
list.append(10)
list.append(3)
print('--append--')
for i in enumerate(list): #enumerate return an enumerate object.if list it [(0,2),(1,10),(2,3)]
print('i:{}, id:{}'.format(i[1],i[0]))# for getting index number i[0]
The id function is rarely used in actual programming, and usually, you use the list index to deal with lists. Your example will look something like:
mylist = []
mylist.append(2)
mylist.append(10)
mylist.append(3)
print(mylist)
Output:
[2,10, 3]
Sample code:
for x in range(len(mylist)):
print(x, mylist[x])
Output:
0, 2
1, 10
2, 3
You may check one of the good python tutorials on the web such as the one on the python web page: https://docs.python.org/3/tutorial/
id()does? docs.python.org/3/library/functions.html#ididare not the same thing.