New submission from bonnet:

struct.calcsize('iiiii?') : 21

appears to be incorrect ; in C sizeof : 24

C code:
typedef struct {
  int   param1;
  int   param2;
  int   param3;
  int   param4;
  int   param5;
  unsigned char param6;
} struct_titi6;

main:
struct_titi6 toto3;
printf("taille toto3 : %d\n",sizeof(toto3));
printf("taille toto3.param1 : %d\n",sizeof(toto3.param1));
printf("taille toto3.param6 : %d\n",sizeof(toto3.param6));

results:
taille toto3 : 24
taille toto3.param1 : 4
taille toto3.param6 : 1

----------
components: Library (Lib)
messages: 185834
nosy: boa124
priority: normal
severity: normal
status: open
title: struct.calcsize() incorrect
type: behavior
versions: Python 2.6

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17617>
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