| Format | C Type | Python type | Standard size | Notes |
|---|---|---|---|---|
| x | pad byte | no value | ||
| c | char | bytes of length 1 | 1 | |
| b | signed char | integer | 1 | (1),(3) |
| B | unsigned char | integer | 1 | (3) |
| ? | _Bool | bool | 1 | (1) |
| h | short | integer | 2 | (3) |
| H | unsigned short | integer | 2 | (3) |
| i | int | integer | 4 | (3) |
| I | unsigned int | integer | 4 | (3) |
| l | long | integer | 4 | (3) |
| L | unsigned long | integer | 4 | (3) |
| q | long long | integer | 8 | (2), (3) |
| Q | unsigned long long | integer | 8 | (2), (3) |
| n | ssize_t | integer | (4) | |
| N | size_t | integer | (4) | |
| e | (7) | float | 2 | (5) |
| f | float | float | 4 | (5) |
| d | double | float | 8 | (5) |
| s | char[] | bytes | ||
| p | char[] | bytes | ||
| P | void * | integer | (6) |
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