https://build.chromium.org/p/chromium.chromedriver/builders/Win7

First build that failed :https://build.chromium.org/p/chromium.chromedriver/builders/Win7/builds/21882

The system cannot find the file specified.
'"E:\b\depot_tools\\python.exe"' is not recognized as an internal or external command,
operable program or batch file.

Could someone please take a look? Thanks.