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CREATE TABLE IF NOT EXISTS `country` ( | |
`id` int(11) NOT NULL AUTO_INCREMENT, | |
`iso` char(2) NOT NULL, | |
`name` varchar(80) NOT NULL, | |
`nicename` varchar(80) NOT NULL, | |
`iso3` char(3) DEFAULT NULL, | |
`numcode` smallint(6) DEFAULT NULL, | |
`phonecode` int(5) NOT NULL, | |
PRIMARY KEY (`id`) | |
) ENGINE=MyISAM DEFAULT CHARSET=latin1; |
Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.
For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.
This gives an ongoing list of file-type magic numbers.
#!/usr/bin/python | |
import socket #for sockets | |
import sys #for exit | |
try: | |
#create an AF_INET, STREAM socket (TCP) | |
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
except socket.error, msg: | |
print 'Failed to create socket. Error code: ' + str(msg[0]) + ' , Error message : ' + msg[1] |