Python complex() built-in function
From the Python 3 documentation
Return a complex number with the value real + imag*1j or convert a string or number to a complex number. [...] Each argument may be any numeric type (including complex). If imag is omitted, it defaults to zero and the constructor serves as a numeric conversion like int and float. If both arguments are omitted, returns 0j.
>>> complex(1) # (1+0j) >>> complex('1') # (1+0j) >>> complex(100) # (100+0j) >>> complex('100') # (100+0j)
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