fixed single thread scanner.py

[vijay-jangir]

improved pylint score for scanner.py removed python literal dir as variable fixed bug #152

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.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

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

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have added all the three reviewers: @vinitshahdeo @Kashish121 & @ishika1727

[vijay-jangir]

nope, still can't seem to find a way to asssign reviewer. github is surely different from gitlab. Please approve this request. Thanks @vinitshahdeo