How to get a complex number as a user input in python?

Pass your input to the complex type function. This constructor can also be called with a string as argument, and it will attempt to parse it using Python's representation of complex numbers.

Example

my_number = complex(input("Number"))

Note that Python uses "j" as a symbol for the imaginary component; you will have to tell your user to input numbers in this format: 1+3j

If you would like your calculator to support a different syntax, you will have to parse the input and feed it to the complex constructor yourself. Regular expressions may be of help.

In order to get complex type input from user we have to use complex type function as suggested by @sleblanc. And if you want to separate real and imaginary part then you have to do like this:

complx = complex(input());
print(complx.real, complx.imag);

Example Output:-

>>> complx = complex(input());
1+2j
>>> print(complx.real, complx.imag);
1.0 2.0
>>> 

There is no such way to input directly a complex number in Python. But how we can do is take a complex number. Method 1- Take a sting as input then convert it into complex. Method 2- Take two separate numbers and then convert them into complex.

Code for Method 1-

a = input()          # user will enter 3+5j
a = complex(a)       # then  this will be converted into complex number.

Code for Method 2-

a ,b = map(int, input().split())
c = complex(a, b) 

I know this is an old question and is already solved, but I had a little fun messing with it and including numpy to report the angle of the resulting complex number:

import numpy as np

def add(x, y):
   """This function adds two numbers"""
   z1=x+y
   print(num1,"+",num2,"=", z1)
   return z1
...
...

num1 = complex(input("Enter first number: "))
num2 = complex(input("Enter second number: "))

if choice == '1':
   z2=add(num1,num2)
   print('mag = ', abs(z2))
   print('angle = ', np.angle(z2, deg=True))
...
...

I like it, but I might trim the length of some of the resulting numbers, lol:

Select operation.
1.Add
2.Subtract
3.Multiply
4.Divide
Enter choice: 1, 2, 3, or 4: 1
Enter first number: 2+2j
Enter second number: 1+j
(2+2j) + (1+1j) = (3+3j)
mag =  4.242640687119285
angle =  45.0

def add(x, y):
  """This function adds two numbers"""
  return x + y

def subtract(x, y):
  """This function subtracts two numbers"""
  return x - y

def multiply(x, y):
  """This function multiplies two numbers"""
  return x * y

def divide(x, y):
  """This function divides two numbers"""
  if y == 0:
    return "Error! Cannot divide by zero."
  return x / y

print("Select operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")

while True:
  # Take input from the user
  choice = input("Enter choice(1/2/3/4): ")

  # Check if the choice is one of the four options
  if choice in ('1', '2', '3', '4'):
    try:
      num1 = float(input("Enter first number: "))
      num2 = float(input("Enter second number: "))
    except ValueError:
      print("Invalid input. Please enter a number.")
      continue

    if choice == '1':
      print(num1, "+", num2, "=", add(num1, num2))

    elif choice == '2':
      print(num1, "-", num2, "=", subtract(num1, num2))

    elif choice == '3':
      print(num1, "*", num2, "=", multiply(num1, num2))

    elif choice == '4':
      print(num1, "/", num2, "=", divide(num1, num2))
    
    # Check if user wants to do another calculation
    next_calculation = input("Do you want to do another calculation? (yes/no): ")
    if next_calculation.lower() != 'yes':
      break
  else:
    print("Invalid Input")

You can do it using this code:

class complex:
    def sum(self):
    n=int(input("how many num's you want to add:"))
    self.num1=[]
    self.num2=[]
    a=0
    b=0
    for i in range(1,n+1):
      print("enter num",i,": ")
      print("enter real part of num",i,": ",end=" ")
      self.num1.append(int(input()))
      print("enter img part of num",i,": ",end=" ")
      self.num2.append(int(input()))
    print("Following are the complex numbers you have entered:")
    for i in range(n):
      print(self.num1[i],"i+",self.num2[i],"j")
    for i in range(0,len(self.num1)): 
        a=a+self.num1[i]
    for i in range(0,len(self.num2)): 
        b=b+self.num2[i]
    print("sum of given complex no.'s is:",a,"i+",b,"j")
n1=complex()
n1.sum()