No module named 'OS' error in Digi ESP for python

When Python Standard Library is not loaded on digi devices running NDS firmware, you will get the error  no module named OS, Follow the below steps to overcome this error.

• Download the file Python Standard Library for NDS-based products only from digi website under Development Software and Sample Code from the following link, https://www.digi.com/support/productdetail?pid=5042&type=documentation
• Rename the file to python.zip(case sensitive)
• Upload to digi device 
• Reboot the device