Update documentation commands to use new installer (#4839)

* use new installer in README and website
* use double quotes for `pyproject.toml` example
* small improvement for installer note
* doc: use `python3` for invoking Python

README.md

@@ -23,7 +23,7 @@ from the rest of your system.
 
 ### osx / linux / bashonwindows install instructions
 ```bash
-curl -sSL https://install.python-poetry.org | python -
+curl -sSL https://install.python-poetry.org | python3 -
 ```
 ### windows powershell install instructions
 ```powershell
@@ -55,40 +55,40 @@ by running the installer again with the `--uninstall` option or by setting
 the `POETRY_UNINSTALL` environment variable before executing the installer.
 
 ```bash
-python install-poetry.py --uninstall
-POETRY_UNINSTALL=1 python install-poetry.py
+curl -sSL https://install.python-poetry.org | python3 - --uninstall
+curl -sSL https://install.python-poetry.org | POETRY_UNINSTALL=1 python3 -
 ```
 
 By default, Poetry is installed into the user's platform-specific home directory.
 If you wish to change this, you may define the `POETRY_HOME` environment variable:
 
 ```bash
-POETRY_HOME=/etc/poetry python install-poetry.py
+curl -sSL https://install.python-poetry.org | POETRY_HOME=/etc/poetry python3 -
 ```
 
 If you want to install prerelease versions, you can do so by passing `--preview` option to `install-poetry.py`
 or by using the `POETRY_PREVIEW` environment variable:
 
 ```bash
-python install-poetry.py --preview
-POETRY_PREVIEW=1 python install-poetry.py
+curl -sSL https://install.python-poetry.org | python3 - --preview
+curl -sSL https://install.python-poetry.org | POETRY_PREVIEW=1 python3 -
 ```
 
 Similarly, if you want to install a specific version, you can use `--version` option or the `POETRY_VERSION`
 environment variable:
 
 ```bash
-python install-poetry.py --version 1.2.0
-POETRY_VERSION=1.2.0 python install-poetry.py
+curl -sSL https://install.python-poetry.org | python3 - --version 1.2.0
+curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.2.0 python3 -
 ```
 
 You can also install Poetry for a `git` repository by using the `--git` option:
 
 ```bash
-python install-poetry.py --git https://github.com/python-poetry/poetry.git@master
+curl -sSL https://install.python-poetry.org | python3 - --git https://github.com/python-poetry/poetry.git@master
 ````
 
-**Note**: Note that the installer does not support Python < 3.6.
+_Note that the installer does not support Python < 3.6._
 
 ## Updating `poetry`
 
@@ -170,12 +170,12 @@ authors = [
     "Sébastien Eustace <sebastien@eustace.io>"
 ]
 
-readme = 'README.md'  # Markdown files are supported
+readme = "README.md"  # Markdown files are supported
 
 repository = "https://github.com/python-poetry/poetry"
 homepage = "https://github.com/python-poetry/poetry"
 
-keywords = ['packaging', 'poetry']
+keywords = ["packaging", "poetry"]
 
 [tool.poetry.dependencies]
 python = "~2.7 || ^3.2"  # Compatible python versions must be declared here
@@ -195,7 +195,7 @@ pytest = "^3.0"
 pytest-cov = "^2.4"
 
 [tool.poetry.scripts]
-my-script = 'my_package:main'
+my-script = "my_package:main"
 ```
 
 There are some things we can notice here:

docs/_index.md

@@ -28,7 +28,7 @@ from the rest of your system.
 
 ### osx / linux / bashonwindows install instructions
 ```bash
-curl -sSL https://install.python-poetry.org | python -
+curl -sSL https://install.python-poetry.org | python3 -
 ```
 ### windows powershell install instructions
 ```powershell
@@ -62,37 +62,37 @@ by running the installer again with the `--uninstall` option or by setting
 the `POETRY_UNINSTALL` environment variable before executing the installer.
 
 ```bash
-python install-poetry.py --uninstall
-POETRY_UNINSTALL=1 python install-poetry.py
+curl -sSL https://install.python-poetry.org | python3 - --uninstall
+curl -sSL https://install.python-poetry.org | POETRY_UNINSTALL=1 python3 -
 ```
 
 By default, Poetry is installed into the user's platform-specific home directory.
 If you wish to change this, you may define the `POETRY_HOME` environment variable:
 
 ```bash
-POETRY_HOME=/etc/poetry python install-poetry.py
+curl -sSL https://install.python-poetry.org | POETRY_HOME=/etc/poetry python3 -
 ```
 
 If you want to install prerelease versions, you can do so by passing `--preview` option to `install-poetry.py`
 or by using the `POETRY_PREVIEW` environment variable:
 
 ```bash
-python install-poetry.py --preview
-POETRY_PREVIEW=1 python install-poetry.py
+curl -sSL https://install.python-poetry.org | python3 - --preview
+curl -sSL https://install.python-poetry.org | POETRY_PREVIEW=1 python3 -
 ```
 
 Similarly, if you want to install a specific version, you can use `--version` option or the `POETRY_VERSION`
 environment variable:
 
 ```bash
-python install-poetry.py --version 1.2.0
-POETRY_VERSION=1.2.0 python install-poetry.py
+curl -sSL https://install.python-poetry.org | python3 - --version 1.2.0
+curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.2.0 python3 -
 ```
 
 You can also install Poetry for a `git` repository by using the `--git` option:
 
 ```bash
-python install-poetry.py --git https://github.com/python-poetry/poetry.git@master
+curl -sSL https://install.python-poetry.org | python3 - --git https://github.com/python-poetry/poetry.git@master
 ````
 
 {{% note %}}