CODEWITHSUNDEEP
pythonobjectmemory
RY_ Zheng
RY_ Zheng

Reputation: 3427

python: Why memory space of a object will increase when object converted int to bytearray?

I am confused :

(1) when int convert to bytearray (or str convert to bytearray) ,why its memory space increase ? 

a=1  # int 
print 'space of int ',sys.getsizeof(a)
b=bytearray(a) # convert
print 'space of b ',sys.getsizeof(b)

s='h' # str 
print 'space of s',sys.getsizeof(s)
b2=bytearray(s)
print 'space of b2',sys.getsizeof(b2)

output:

space of a  12
space of b  26
space of s 22
space of b2 26

(2) I have read this , In-memory size of a Python structure and I have known different types of a python object has different memory size.But I can't figure out its principle.

Upvotes: 0

Views: 77

Answers (1)

Ethan Furman
Ethan Furman

Reputation: 69041

Every Python type has a minimal amount of space it will use, even if empty. This is commonly called the overhead.

Container datatypes (dict, list, tuple, bytearray, set, etc.) will typically have more overhead than simple types (str, int, etc.) because there is more to keep track of (size, pointers to elements, etc.).

Upvotes: 1

Related Questions