Inline
PyCharm provides the following inline refactorings:
 The Inline Variable refactoring replaces redundant variable usage with its initializer. This refactoring is opposite to Extract Variable.
Example
Before  After 

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

import math
class Solver:
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)
Solver().demo()

To perform the inline refactoring
 Place the caret in the editor at the desired symbol to be inlined.
 Do one of the following:
 On the main menu or on the context menu of the selection, choose Refactor  Inline .
 Press Ctrl+Alt+N.
 In the Inline dialog box that corresponds to the selected symbol, confirm the inline refactoring.
See Also
Procedures:
Reference:
Web Resources:
Last modified: 3 February 2015