Analyze duplicates

PyCharm enables spotting duplicates on the fly. The analysis is performed by means of the Duplicated code fragment inspection, which you can find under the General node in the Editor | Inspections page of the IDE settings CtrlAlt0S.

If you stumble upon an existing duplicate or somehow create one by writing or pasting code, PyCharm reports a problem and suggests quick-fixes that let you navigate to the detected duplicates, or view all of them in the Duplicates tool window.

1. Press CtrlAlt0S to open the IDE settings and then select Editor | Duplicates.

2. On the Duplicates page that opens, select the file types, to which duplicates analysis should apply. Additionally, select the Variable or identifier names/Function or field names/Constant values checkboxes to define whether two identical entities that use different names should be treated as duplicates.

   For example, if the Variable or identifier names and Function or field names are enabled, the following two functions will be considered duplicate:

   def demo(a, b, c):
       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)
   
   
   def sqrt_func(n, m, k):
       return_type_of_sqrt = math.sqrt(m ** 2 - 4 * n * k)
       result1 = (-m + return_type_of_sqrt) / (2 * n)
       result2 = (-m - return_type_of_sqrt) / (2 * n)
       print(result1, result2)

3. Press CtrlAlt0S to open the IDE settings and then select Editor | Inspections.

4. Select the Duplicated code fragment inspection under the General node.

5. In the inspection options, select whether you want to view duplicates only within the same file or across the entire project. In the Do not show duplicates simpler than field for the necessary file type, set the size of duplicated language constructs to be detected. In the Python context, the constructs less than 45 units are ignored by default. Alter the number of units to enable duplicate detection for smaller code fragments. The value of units can be calculated as follows: units = 2*<number of statements> + <number of expressions>.