Extract field

The Extract Field refactoring lets you declare a new field and initialize it with the selected expression. The original expression is replaced with the usage of the field.

Extract a field in place

Place the caret within a piece of code you want to extract into a field.
Press Ctrl+Alt+F or go to Refactor | Extract Field in the main menu.
Select an expression you want to introduce as a field.
If PyCharm detects more than one occurrence in your code, it lets you specify which occurrences to replace.
If relevant, specify where the new field will be initialized - in the current method, or in a class constructor.
Specify the name of the field. Select the name from the list or type the name in the box with a red border.
To complete the refactoring, press Tab or Enter.

Example

                import math


                class SolverEquation:
                    def demo(self):
                        a = 3
                        b = 25
                        c = 46
                        root1 = (-b + math.sqrt(b**2 - 4*a*c)) / (2*a)
                        root2 = (-b - math.sqrt(b**2 - 4*a*c)) / (2*a)
                        print(root1, root2)
            

                import math


                class SolverEquation:
                    def demo(self):
                        a = 3
                        b = 25
                        c = 46
                        self.math_sqrt = math.sqrt(b ** 2 - 4 * a * c)
                        root1 = (-b + self.math_sqrt) / (2 * a)
                        root2 = (-b - self.math_sqrt) / (2 * a)
                        print(root1, root2)

            

Last modified: 26 May 2024