From the desktop, press the Windows + X shortcut key combination.
In the menu, select Command Prompt (Admin).
On the User Account Control (UAC) prompt, click Yes.
In the command prompt window, type SFC /scannow and press Enter.
System file checker utility checks the integrity of Windows system files and repairs them if required. After the process is complete, reboot the computer.
The hash() method returns the hash value of an object if it has one. Hash values are just integers that are used to compare dictionary keys during a dictionary look quickly.