Gopher Bull Snake

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i was wondering if anyone can help me. i bought a bull snake from the pet shop the other day and it has been out 3 times since i got it, and it was fine, but when i went to take it out this morning it bit me? has anyone got any tips on how to tame it properly coz i dont know why it struck because it was fine last night? i have had pythons and corn snakes before but this one seems very temermental.