OS X EI Capitan(10.11.6) AWS CLIの インストールエラー（python-dateutil）

[AWS CLI のインストールと設定](http://docs.aws.amazon.com/ja_jp/streams/latest/dev/kinesis-tutorial-cli-installation.html) にある通り、下記のコマンドを実行したところ、 `awscli` のインストールでエラー

```bash
curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"
sudo python get-pip.py
sudo pip install awscli
```

## エラー内容

```bash
Installing collected packages: docutils, futures, python-dateutil, jmespath, botocore, s3transfer, colorama, PyYAML, pyasn1, rsa, awscli
  Found existing installation: python-dateutil 1.5
    Uninstalling python-dateutil-1.5:
Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 778, in install
    requirement.uninstall(auto_confirm=True)
  File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 754, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
    renames(path, new_path)
  File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 267, in renames
    shutil.move(old, new)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 299, in move
    copytree(src, real_dst, symlinks=True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 208, in copytree
    raise Error, errors
Error: [('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/easter.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/easter.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/easter.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/easter.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/easter.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/easter.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/parser.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/parser.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/parser.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/parser.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/parser.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/parser.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/relativedelta.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/relativedelta.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/relativedelta.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/relativedelta.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/relativedelta.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/relativedelta.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/rrule.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/rrule.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/rrule.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/rrule.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/rrule.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/rrule.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tz.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tz.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tz.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tz.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tz.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tz.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tzwin.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tzwin.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tzwin.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tzwin.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tzwin.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/tzwin.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/__init__.py', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/__init__.py', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/__init__.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/__init__.pyc', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/__init__.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/__init__.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/zoneinfo-2010g.tar.gz', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/zoneinfo-2010g.tar.gz', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo/zoneinfo-2010g.tar.gz'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/zoneinfo'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil', '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil', "[Errno 1] Operation not permitted: '/tmp/pip-MxnWQ6-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil'")]
```

## 対処

python-dateutilが既に入っているのが悪いと言っているよう

```bash
Found existing installation: python-dateutil 1.5
    Uninstalling python-dateutil-1.5:
```

ignoreしてみる

```bash
sudo pip install awscli --upgrade --ignore-installed python-dateutil
```

入った！

```bash
Successfully installed PyYAML-3.12 awscli-1.11.30 botocore-1.4.87 colorama-0.3.7 docutils-0.13.1 futures-3.0.5 jmespath-0.9.0 pyasn1-0.1.9 python-dateutil-2.6.0 rsa-3.4.2 s3transfer-0.1.10 six-1.10.0
```

スキップしたことで問題が出れば 報告します。