The complex() function creates a complex number in Python, which consists of a real part and an imaginary part (denoted as j). This is useful in mathematics, engineering, and scientific computing.
Simple Example
num = complex(3, 4)
print(num) # Output: (3+4j)Here, 3 is the real part, and 4j is the imaginary part.
Syntax
complex(real, imaginary)- real → The real part (default is
0). - imaginary → The imaginary part (default is
0).
You can also create complex numbers from a string:
num = complex("2+5j")
print(num) # Output: (2+5j)1. Accessing Real and Imaginary Parts
You can get the real and imaginary parts separately:
num = complex(7, -3)
print(num.real) # Output: 7.0
print(num.imag) # Output: -3.0This is useful when working with complex number operations.
2. Performing Mathematical Operations
Complex numbers support basic math operations:
a = complex(2, 3)
b = complex(1, 4)
print(a + b) # Output: (3+7j)
print(a * b) # Output: (-10+11j)These operations are common in signal processing, physics, and engineering.
3. Using complex() in Scientific Calculations
Python’s cmath module provides advanced functions for complex numbers:
import cmath
num = complex(1, 1)
print(cmath.sqrt(num)) # Output: (1.09868411346781+0.45508986056222733j)Useful for electrical engineering, quantum mechanics, and fluid dynamics.
4. Using Complex Numbers in SQL & Data Processing
Some databases store complex numbers as strings. Convert them before performing calculations:
db_value = "3+2j"
num = complex(db_value)
print(num * 2) # Output: (6+4j)This ensures accurate calculations when retrieving data from databases.
Key Notes
- ✔ Creates complex numbers easily – supports both numeric and string input.
- ✔ Access real and imaginary parts – useful for calculations.
- ✔ Supports mathematical operations – addition, multiplication, etc.
- ✔ Works with
cmathfor advanced calculations – essential for scientific computing.
By using complex(), you can handle complex numbers efficiently, whether in engineering, physics, or database processing. 🚀