fixed error #3208 #3204

[surajkumar-sk]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
Module named io is imported and io.open() is used instead of open() for fixing encoding error which occurs in python2 .
added encoding type as utf-8 in line 251 for fixing UnicodeDecodeError
Fixes # (issue)
#3208
#3204

Screenshots (optional)

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project

• I have performed a self-review of my own code

• New and existing unit tests pass locally with my changes

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[surajkumar-sk]

@googlebot I fixed it.

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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