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class complex([real[, imag]])

>>> complex(1, 2)
(1 + 2j)

>>> complex(1)    # Number
(1 + 0j)

>>> complex("1")  # Treated as a string
(1 + 0j)

# Note: There should be no spaces around the "+" sign, it should be "1+2j" instead of "1 + 2j", otherwise it will raise an error
>>> complex("1+2j")
(1 + 2j)