pack

Syntax

pack(format, args…)

Arguments

format is a format string. See Appendix: Format Characters.

  • A format character may be preceded by an integral repeat count. For example, the format string 4h means exactly the same as hhhh.

  • Whitespace characters between formats are ignored; a count and its format must not contain whitespace though.

  • For the s format character, the count is interpreted as the length of the bytes, not a repeat count like for the other format characters; for example, 10s means a single 10-byte string, while 10c means 10 characters. If a count is not given, it defaults to 1. The string is truncated or padded with null bytes as appropriate to make it fit.

args... The data to be packed. The arguments must match the values required by the format exactly.

Details

Return a bytes object packed according to the format string format.

Examples

res = pack("N",1);
res1 = unpack("N", res);
print(res1)
// output
(1)

res = pack("iii", 1, 2, 3)
res1 = unpack("iii",  res);
print(res1)
// output
(1,2,3)

res = pack("x",NULL)
res = unpack("x",pack("x",NULL))
typestr(res[0])
// output
VOID

res = pack("3si", `123, 3)
res1 = unpack("3si",  res);
print(res1)
// output
("123",3)