Switch apt the magical efficacy of python 's calcs

struct python 's binary file archive to deal with change namely very easy, can be lightly carried out at unpack the contents of the document read to read to the variable .
Need to specify when the phone to unpack 2 parameters ,GHD Carry Case & Heat Mat, the first is to read the contents of the format string (such for Unpack format string in the specified variable , merely too specifies the contents of the file to read the secondary length is the length of the second argument ,GHD Green Straighteners, the two have to be invariable ,GHD Benefit Straighteners, otherwise it will dart an exception.
Of way,GHD Blue Butterfly 2011, the length of the content along to format string multiplication them yourself , so there is not problem ,GHD Purple Butterfly 2011, but the trouble is also disposed to peccadillo. struct package provides a simpler usage is to calcsize function. The format string for an argument to the function to return the content length to be read ,GHD Rare Straighteners, is no very handy ? !