Python complex() Function
Converts a string or number to a complex number
complex() function creates a complex number when real and imaginary parts are specified.
It can also convert a string to a complex number.
The complex number is returned in the form of real + imaginary, where the imaginary part is followed by a j.
|real||Optional||The real part of the complex number.
Default is 0.
|imaginary||Optional||The imaginary part of the complex number.
Default is 0.
Creating Complex Numbers
You can create a complex number by specifying real and imaginary parts.
x = complex(3, 2) print(x) # Prints (3+2j) x = complex(-3, 2) print(x) # Prints (-3+2j) x = complex(3, -2) print(x) # Prints (3-2j)
If you omit one of the arguments, it is assumed as 0; because the default value of real and imaginary parameters is 0.
# omit imaginary part x = complex(3) print(x) # Prints (3+0j) # omit real part x = complex(0, 4) print(x) # Prints 4j # omit both x = complex() print(x) # Prints 0j
Convert a String to a Complex Number
You can convert a string to a complex number by specifying the first parameter as a string like
'3+4j'. In this case the second parameter should be omitted.
# Convert a string '3+4j' to a complex number x = complex('3+4j') print(x) # Prints (3+4j)
When converting from a string, the string must not contain whitespace around the central + or – operator. Otherwise, the function raises
# Triggers ValueError: complex() arg is a malformed string x = complex('3 + 4j') print(x)
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