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Maybe you understand from this interactive session by 'no comments' style: [CODE] >>> from math import * >>> sqrt(-1) Traceback (most recent call last): File "<pyshell#1>", line 1, in <module> sqrt(-1) ValueError: math domain error >>> sqrt(-1+0j) Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> sqrt(-1+0j) TypeError: … Read More

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