print memory address of Python variable

Question

How do I print the memory address of a variable in Python 2 7   I know id   returns the  id  of a variable or object  but this doesn t return the expected 0x3357e182 style I was expecting to see for a memory address   I want to do something like print  amp x  where x is a C   int variable for example  How can I do this in Python

User · Answer

According to the manual  in CPython id   is the actual memory address of the variable  If you want it in hex format  call hex   on it   x   5 print hex id x     this will print the memory address of x

User · Answer

There is no way to get the memory address of a value in Python 2 7 in general  In Jython or PyPy  the implementation doesn t even know your value s address  and there s not even a guarantee that it will stay in the same place   e g   the garbage collector is allowed to move it around if it wants    However  if you only care about CPython  id is already returning the address  If the only issue is how to format that integer in a certain way    it s the same as formatting any integer    gt  gt  gt  hex 33  0x21  gt  gt  gt      010x   format 33    32-bit 0x00000021  gt  gt  gt      018x   format 33    64-bit 0x0000000000000021       and so on   However  there s almost never a good reason for this  If you actually need the address of an object  it s presumably to pass it to ctypes or similar  in which case you should use ctypes addressof or similar

User · Answer

id is the method you want to use  to convert it to hex   hex id variable here    For instance   x   4 print hex id x     Gave me   0x9cf10c   Which is what you want  right    Fun fact  binding two variables to the same int may result in the same memory address being used   Try   x   4 y   4 w   9999 v   9999 a   12345678 b   12345678 print hex id x   print hex id y   print hex id w   print hex id v   print hex id a   print hex id b     This gave me identical pairs  even for the large integers

[python] print memory address of Python variable

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