pack template , list
Takes a list of values and packs it into a binary structure, returning the string containing the structure. The template is a sequence of characters that give the order and type of values, as follows:
Each character may optionally be followed by a number that gives a repeat
count. Together the character and the repeat count make a field specifier.
Field specifiers may be separated by whitespace, which will be ignored. With
all types except
The same template may generally also be used in the