4 ms·

Except that pip doesn't actually do the install part, you need some other module for that.

by guappa 3y ago

eesmith 3y ago
I do not understand your comment. What module are you talking about? What prevents the pip from a normal CPython installation from doing an install? You can even bootstrap pip via the ensurepip module documented at https://docs.python.org/3/library/ensurepip.html https://docs.python.org/3/library/ensurepip.html which notes "This module does not access the internet. All of the components needed to bootstrap pip are included as internal parts of the package."
- guappa 3y ago
  How do create a package that can be installed using pip? Can you do that without setuptools or similar?
  - eesmith 3y ago
    Right, but creating a package is not the same as installing a package, and your comment at https://news.ycombinator.com/item?id=38083296 https://news.ycombinator.com/item?id=38083296 concerned installing. > Can you do that without setuptools or similar? Sure. Here is a program which, when run, creates the zipfile "hello-1.0-py3-none-any.whl" containing the wheel for a package named "hello" along with an entry point for the command-line program also named "hello" # Create a wheel for a 'Hello, world!' Python package. # # To install: # pip install hello-1.0-py3-none-any.whl # # To use on the command-line: # hello # # To use from Python: # >>> import hello # >>> hello.main() # Hello, world! # # To uninstall: # pip uninstall hello import base64, hashlib, zipfile package_name = "hello" version = "1.0" # This will go in hello/__init__.py payload = """ def main(): print("Hello, world!") """ METADATA = f"""\ Metadata-Version: 2.1 Name: {package_name} Version: {version} Summary: Example of a hand-built wheel. Home-page: http://news.ycombinator.com/ Author: eesmith Author-email: eesmith@example.com License: Public Domain Platform: UNKNOWN UNKNOWN """ # This causes the installer to create the command-line 'hello' program. entry_points = """\ [console_scripts] hello = hello:main """ WHEEL = """\ Wheel-Version: 1.0 Generator: eesmith_wheelgen (0.0.0) Root-Is-Purelib: true Tag: py3-none-any """ top_level = f""" {package_name} """ def build(): wheel_name = f"{package_name}-{version}-py3-none-any.whl" with zipfile.ZipFile(wheel_name, "w") as zip: dist_info = f"{package_name}-{version}.dist-info" # Add a file and build up information needed for the RECORD . record_lines = [] def add_file(filename, content): with zip.open(filename, "w") as f: byte_content = content.encode("utf8") f.write(byte_content) digest = hashlib.sha256(byte_content).digest() encoded = base64.urlsafe_b64encode(digest).rstrip(b"=") record_line = f"{filename},sha256={encoded},{len(byte_content)}\n" record_lines.append(record_line.encode("utf8")) add_file(f"{package_name}/__init__.py", payload) add_file(f"{dist_info}/METADATA", METADATA) add_file(f"{dist_info}/WHEEL", WHEEL) add_file(f"{dist_info}/entry_points.txt", entry_points) add_file(f"{dist_info}/top_level.txt", top_level) with zip.open(f"{dist_info}/RECORD", "w") as f: f.writelines(record_lines) if __name__ == "__main__": build()
    - guappa 3y ago
      Surely you can't install a package if you first can't create it?
      - eesmith 3y ago
        You can easily install a third-party package, which will bootstrap you to one way to create package. But, okay, you want to install a package you wrote, using only a stock Python installation. 1) Why? That is, you can modify your PYTHONPATH to include your working directory. 2) Why use an installer? For simple packages you can drop the file/directory into site-packages. 3) I've been using Python for long enough that I distributed Python packages before there was a setup.py or setuptools. I used a Makefile. In fact, I still use a Makefile when I need faster build cycle times as setup.py does not do good dependency management. 4) I showed you how to build a wheel using only stock Python code, which lets you use pip as the installer. Finally, with a source distribution you can tweak Python's own Makefile to build your own module, including a C extension: https://docs.python.org/3/extending/extending.html#compilation-and-linkage https://docs.python.org/3/extending/extending.html#compilati... Why don't any of these resolve your issue?

Except that pip doesn't actually do the install part, you need some other module for that.

by guappa 3y ago

Except that pip doesn't actually do the install part, you need some other module for that.

I do not understand your comment. What module are you talking about? What prevents the pip from a normal CPython installation from doing an install? You can even bootstrap pip via the ensurepip module documented at https://docs.python.org/3/library/ensurepip.html https://docs.python.org/3/library/ensurepip.html which notes "This module does not access the internet. All of the components needed to bootstrap pip are included as internal parts of the package."

guappa 3y ago
How do create a package that can be installed using pip? Can you do that without setuptools or similar?
- eesmith 3y ago
  Right, but creating a package is not the same as installing a package, and your comment at https://news.ycombinator.com/item?id=38083296 https://news.ycombinator.com/item?id=38083296 concerned installing. > Can you do that without setuptools or similar? Sure. Here is a program which, when run, creates the zipfile "hello-1.0-py3-none-any.whl" containing the wheel for a package named "hello" along with an entry point for the command-line program also named "hello" # Create a wheel for a 'Hello, world!' Python package. # # To install: # pip install hello-1.0-py3-none-any.whl # # To use on the command-line: # hello # # To use from Python: # >>> import hello # >>> hello.main() # Hello, world! # # To uninstall: # pip uninstall hello import base64, hashlib, zipfile package_name = "hello" version = "1.0" # This will go in hello/__init__.py payload = """ def main(): print("Hello, world!") """ METADATA = f"""\ Metadata-Version: 2.1 Name: {package_name} Version: {version} Summary: Example of a hand-built wheel. Home-page: http://news.ycombinator.com/ Author: eesmith Author-email: eesmith@example.com License: Public Domain Platform: UNKNOWN UNKNOWN """ # This causes the installer to create the command-line 'hello' program. entry_points = """\ [console_scripts] hello = hello:main """ WHEEL = """\ Wheel-Version: 1.0 Generator: eesmith_wheelgen (0.0.0) Root-Is-Purelib: true Tag: py3-none-any """ top_level = f""" {package_name} """ def build(): wheel_name = f"{package_name}-{version}-py3-none-any.whl" with zipfile.ZipFile(wheel_name, "w") as zip: dist_info = f"{package_name}-{version}.dist-info" # Add a file and build up information needed for the RECORD . record_lines = [] def add_file(filename, content): with zip.open(filename, "w") as f: byte_content = content.encode("utf8") f.write(byte_content) digest = hashlib.sha256(byte_content).digest() encoded = base64.urlsafe_b64encode(digest).rstrip(b"=") record_line = f"{filename},sha256={encoded},{len(byte_content)}\n" record_lines.append(record_line.encode("utf8")) add_file(f"{package_name}/__init__.py", payload) add_file(f"{dist_info}/METADATA", METADATA) add_file(f"{dist_info}/WHEEL", WHEEL) add_file(f"{dist_info}/entry_points.txt", entry_points) add_file(f"{dist_info}/top_level.txt", top_level) with zip.open(f"{dist_info}/RECORD", "w") as f: f.writelines(record_lines) if __name__ == "__main__": build()
  - guappa 3y ago
    Surely you can't install a package if you first can't create it?
    - eesmith 3y ago
      You can easily install a third-party package, which will bootstrap you to one way to create package. But, okay, you want to install a package you wrote, using only a stock Python installation. 1) Why? That is, you can modify your PYTHONPATH to include your working directory. 2) Why use an installer? For simple packages you can drop the file/directory into site-packages. 3) I've been using Python for long enough that I distributed Python packages before there was a setup.py or setuptools. I used a Makefile. In fact, I still use a Makefile when I need faster build cycle times as setup.py does not do good dependency management. 4) I showed you how to build a wheel using only stock Python code, which lets you use pip as the installer. Finally, with a source distribution you can tweak Python's own Makefile to build your own module, including a C extension: https://docs.python.org/3/extending/extending.html#compilation-and-linkage https://docs.python.org/3/extending/extending.html#compilati... Why don't any of these resolve your issue?