Fast fix for yaml import

[ehooo]

Fast fix for #286

• Fix pep8 in example
• Check importation

[lukehinds]

This does not find an issue when running against your example:

bandit -r examples/yaml_lib_load.py

However if you change bandit/plugins/yaml_load.py:58 to:

if context.is_module_imported_like('yaml') and \

It reports the issue

[ehooo]

@lukehinds as I undertood on the ticket #286 the issue is that the "examples/yaml_lib_load.py" is false positive; so bandit -r examples/yaml_lib_load.py must be 0 issues.

In other case change is not requierd because now "examples/yaml_lib_load.py" cause 1 issue.

[lukehinds]

@ehooo yes, you're totally correct, I misread the issue.

[ericwb]

Please avoid using \ in long if statement lines. Use ( ) instead

[ehooo]

done

misunderstood issue

[lukehinds]

So I don't think we need the examples/yaml_lib_load.py in the patch. Its good for validating the patch works as expected, but I believe examples/* is for code snippets that have a positive match, and not insuring false positives do not occur, e.g. everything in examples should find an issue.