Conformance to style standards

[mosesmeirelles]

Fixes #632

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• update .travis.yml to verify PEP8 errors
• made changes in files as suggested by pycodestyle following PEP8 code compliance

├── register.py
├── setup.py
├── examples
│   ├── campaigns
│   │   └── campaigns.py
│   ├── categories
│   │   └── categories.py
│   ├── helpers
│   │   ├── mail_example.py
│   │   └── stats
│   │       └── stats_example.py
│   └── mail
│       └── mail.py
├── sendgrid
│   ├── sendgrid.py
│   └── helpers
│       ├── endpoints
│       │   └── ip
│       │      └── unassigned.py
│       ├── inbound
│       │   ├── app.py
│       │   ├── config.py
│       │   └── send.py
│       └── mail
│           ├── content.py
│           ├── exceptions.py
│           ├── mail.py
│           ├── personalization.py
│           ├── subscription_tracking.py
│           ├── tracking_settings.py
│           └── validators.py
├── sendgrid
│   ├── test_app.py
│   ├── test_mail.py
│   ├── test_project.py
│   ├── test_sendgrid.py
│   ├── test_stats.py
│   └── test_unassigned.py

If you have questions, please send an email to SendGrid, or file a GitHub Issue in this repository.

[SendGridDX]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #654 into v4 will increase coverage by 0.42%.
The diff coverage is 75.67%.

@@            Coverage Diff             @@
##               v4     #654      +/-   ##
==========================================
+ Coverage   84.35%   84.77%   +0.42%     
==========================================
  Files          36       35       -1     
  Lines         965     1156     +191     
  Branches      107      172      +65     
==========================================
+ Hits          814      980     +166     
+ Misses         93       90       -3     
- Partials       58       86      +28

Impacted Files	Coverage Δ
sendgrid/helpers/mail/content.py	84.61% <ø> (ø)	⬆️
sendgrid/helpers/inbound/config.py	93.93% <ø> (ø)	⬆️
sendgrid/helpers/mail/validators.py	44.44% <ø> (ø)	⬆️
sendgrid/helpers/mail/tracking_settings.py	96.96% <ø> (ø)	⬆️
sendgrid/sendgrid.py	92% <100%> (+6.28%)	⬆️
sendgrid/helpers/inbound/app.py	78.26% <100%> (ø)	⬆️
sendgrid/helpers/mail/subscription_tracking.py	87.87% <100%> (ø)	⬆️
sendgrid/helpers/inbound/send.py	93.75% <100%> (ø)	⬆️
sendgrid/helpers/mail/personalization.py	93.25% <100%> (+0.2%)	⬆️
sendgrid/version.py	100% <100%> (ø)
... and 23 more

---

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[hugovk]

In .travis.yml:

# errors W605 and W504 added to avoid inconsistent errors happening
# error W605 happening on validators.py:28:40 on a valid Regex
# error W504 happening on validators.py:54:29 on a valid line break operator
- pycodestyle --ignore=W605,W504 --exclude='build'

W605: The regex isn't quite valid, see #698 for a fix. Once that is merged, you should remove the W605 exception.

---

As a general point, it might be better to avoid global exceptions as that means all the other code is excluded. Instead, you can skip checking single lines like this:

regex = "\."  # noqa

Or better, skip checking only a single error type:

regex = "\."  # noqa: W605

Docs: https://pep8.readthedocs.io/en/latest/intro.html#error-codes

[thinkingserious]

Hello @moshemeirelles,

Thanks again for the PR!

It's HACKTOBERFEST! We want to show our appreciation by sending you some special Hacktoberfest swag. If you have not already, could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[thinkingserious]

Hello @moshemeirelles,

Could you please merge this against our v4 branch? Thank you!

With Best Regards,

Elmer

[mosesmeirelles]

Thank you for suggestions @hugovk , I'll fix it 😄

For sure @thinkingserious

[misterdorm]

You'll need to rebase against v4, not merge. This PR now includes all the other history from master, which we don't want. Please rebase to v4 and include only your new commits, and force push to your branch. Or, create a new PR to replace this one. Thanks!