LGTM analysis is failing

[AnupKumarPanwar]

Cause:
The logs imply that the analysis is failing due to improper initialization of the variable on_the_way_back in the following file.
/graphs/Directed and Undirected (Weighted) Graph.py

Logs:

[2019-05-03 14:57:50] [build] 3.7.7 (mccabe: 0.6.1, pycodestyle: 2.5.0, pyflakes: 2.1.1) CPython 3.6.7 on Linux
[2019-05-03 14:57:50] [build] ++ python3 -m flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
[2019-05-03 14:57:57] [build] ./graphs/Directed and Undirected (Weighted) Graph.py:162:100: F821 undefined name 'on_the_way_back'
[2019-05-03 14:57:57] [build] 					if visited.count(__[1]) > 0 and __[1] != parent and indirect_parents.count(__[1]) > 0 and not on_the_way_back:
[2019-05-03 14:57:57] [build]                                                                                                    ^
[2019-05-03 14:57:57] [build] ./graphs/Directed and Undirected (Weighted) Graph.py:209:100: F821 undefined name 'on_the_way_back'
[2019-05-03 14:57:57] [build] 					if visited.count(__[1]) > 0 and __[1] != parent and indirect_parents.count(__[1]) > 0 and not on_the_way_back:
[2019-05-03 14:57:57] [build]                                                                                                    ^
[2019-05-03 14:57:57] [build] ./graphs/Directed and Undirected (Weighted) Graph.py:377:100: F821 undefined name 'on_the_way_back'
[2019-05-03 14:57:57] [build] 					if visited.count(__[1]) > 0 and __[1] != parent and indirect_parents.count(__[1]) > 0 and not on_the_way_back:
[2019-05-03 14:57:57] [build]                                                                                                    ^
[2019-05-03 14:57:57] [build] ./graphs/Directed and Undirected (Weighted) Graph.py:424:100: F821 undefined name 'on_the_way_back'
[2019-05-03 14:57:57] [build] 					if visited.count(__[1]) > 0 and __[1] != parent and indirect_parents.count(__[1]) > 0 and not on_the_way_back:
[2019-05-03 14:57:57] [build]                                                                                                    ^
[2019-05-03 14:57:57] [build] 4     F821 undefined name 'on_the_way_back'
[2019-05-03 14:57:57] [build] 4