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MIT 6.189 A Gentle Introduction to Programming Using Python (OCW) 14 Online
OpenStudy (anonymous):

4.3.3 - Many Tetrominoes. When I implement my code to print a single tetrominoe, everything works, but when I implement the given code to print all 7 I get the error "OBJ_ALREADY_DRAWN." If I comment out this error in graphics.py everything works, and all 7 are drawn correctly. If I return graphics.py back to it's initial state and shorten the list in tetronomes.py to only loop through 1 tetronome everything works, but as soon as that list is longer than one tetronome I get the "OBJ_ALREADY_DRAWN" error. Any ideas for how to get rid of this error? Thanks in advance!

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