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supersheep Imports can be ambiguous in the face of packages; within a package, it's not clear whether import foo refers to a module within the package or some module outside the package. (More precisely, a local module or package can shadow another hanging directly off sys.path.)
For the second problem, it is proposed that all import statements be absolute by default (searching sys.path only) with special syntax (leading dots) for accessing package-relative imports.
意思是说如果你用import aaa,就无法分辨是import本目录的aaa还是sys.path中的aaa
所以如果是确定要import package内部,就要加点