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Hi,what is the meaning of this phrase
Lists in Python, like most things, do not actually contain the items inside them. Rather, they contain references
2 odpowiedzi
+ 1
Python stores every value somewhere in memory, you don't get to see it.
In lists, but also generally, only the addresses are stored.
Basically when you say:
print(x)
You are saying: Please go to the place with the name (reference) x and return me that value.
This is important, because any object in Python can have several references.
a = [] gives the name a to a list that is newly created
b = a creates no new list, but gives another name b to the very same list a.
So two references point to only one object in computer memory, although it looks like you have two separate lists a and b.
Often mistakes happen, because people add something to their list...
a.append('Whatever')
... and expect that b is still empty.
Now if they write...
print(b)
...the word Whatever is printed.
Because when they appended to a, they also appended to b - because it's the same list in reality.
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Python list can store every value.
For example:
A=["NIG",132,132.0,{1,2},{1:2}]
In this list you can see that there is every type of object.