Installation fails due to conflicting idna version

[NeolithEra]

Hi, users are unable to run derrick due to dependency conflict with idna package.

As shown in the following full dependency graph of derrick, derrick requires idna>=2.6，while requests==2.20.0 requires idna>=2.5,<2.8.

According to pip’s “first found wins” installation strategy, idna==2.8 is the actually installed version.
However, idna==2.8 does not satisfy idna>=2.5,<2.8.

Dependency tree---------

derrick-master
| +-chardet(version range:==3.0.4)
| +-docopt(version range:>=0.6.2)
| +-idna(version range:>=2.6)
| +-jinja2(version range:>=2.10.1)
| | +-MarkupSafe(version range:>=0.23)
| +-MarkupSafe(version range:>=1.0)
| +-nose(version range:>=1.3)
| +-pkginfo(version range:>=1.4.1)
| +-prompt-toolkit(version range:==1.0.15)
| | +-six(version range:>=1.9.0)
| | +-wcwidth(version range:*)
| +-pychalk(version range:==1.1.0)
| | +-six(version range:*)
| +-Pygments(version range:>=2.2.0)
| | +-coverage(version range:*)
| | +-nose(version range:*)
| | +-pyflakes(version range:*)
| | +-pylint(version range:*)
| | +-tox(version range:*)
| +-requests(version range:==2.20.0)
| | +-certifi(version range:>=2017.4.17)
| | +-chardet(version range:<3.1.0,>=3.0.2)
| | +-idna(version range:>=2.5,<2.8)
| | +-urllib3(version range:>=1.21.1,<1.25)
| +-requests-toolbelt(version range:==0.8.0)
| | +-requests(version range:>=2.0.1,<3.0.0)
| | | +-certifi(version range:>=2017.4.17)
| | | +-chardet(version range:<3.1.0,>=3.0.2)
| | | +-idna(version range:>=2.5,<2.8)
| | | +-urllib3(version range:>=1.21.1,<1.25)
| +-setuptools-git(version range:==1.2)
| +-simplejson(version range:>=3.11.1)
| +-six(version range:>=1.11.0)
| +-tqdm(version range:>=4.9.12)
| +-urllib3(version range:>=1.23)
| +-wcwidth(version range:>=0.1.7)
| +-whaaaaat(version range:>=0.5.2)
| | +-prompt-toolkit(version range:>=1.0.14)
| | | +-six(version range:>=1.9.0)
| | | +-wcwidth(version range:*)
| | +-pygments(version range:>=2.2.0)
| | | +-coverage(version range:*)
| | | +-nose(version range:*)
| | | +-pyflakes(version range:*)
| | | +-pylint(version range:*)
| | | +-tox(version range:*)
| | +-regex(version range:>=2016.11.21)

Thanks for your help.
Best,
Neolith

[NeolithEra]

Solution

1. Fix your direct dependency to be idna>=2.5,<2.8.

I have checked this revision will not affect your downstream projects now.

2. Upgrade requests to 2.22.0，to remove this conflict.

3. Delete your direct dependency idna and use the idna transitively introduced by requests.

Which solution do you prefer, 1, 2 or 3?

@ringtail Please let me know your choice. I can submit a PR to solve this issue.

[ringtail]

@NeolithEra I would like to choose 1 or 2. Could you submit a PR? Thanks a lot ! ☺

[ringtail]

#42

[ringtail]

Bug Fixed