Detect python_(full_)version in Pipfile(.lock)
Give priority to Pipfile.lock, then Pipfile, then runtime.txt.
MODIFY
repo2docker/buildpacks/python/__init__.py
repo2docker/buildpacks/python/__init__.py
"""Generates Dockerfiles based on an input matrix based on Python."""
import os
+import re
from ..conda import CondaBuildPack
-
class PythonBuildPack(CondaBuildPack):
"""Setup Python for use with a repository."""
@property
def python_version(self):
+ """
+ Detect the Python version declared in a `Pipfile.lock`, `Pipfile`, or
+ `runtime.txt`. Will return 'x.y' if version is found (e.g '3.6'), or a
+ Falsy empty string '' if not found.
+ """
+
if hasattr(self, '_python_version'):
return self._python_version
+ files_to_search_in_order = [
+ {
+ 'path': self.binder_path('Pipfile.lock'),
+ 'pattern': r'\s*\"python_(?:full_)?version\": \"?([0-9a-z\.]*)\"?', # ' "python_version": "3.6"'
+ },
+ {
+ 'path': self.binder_path('Pipfile'),
+ 'pattern': r'python_(?:full_)?version\s*=+\s*\"?([0-9a-z\.]*)\"?', # 'python_version = "3.6"'
+ },
+ {
+ 'path': self.binder_path('runtime.txt'),
+ 'pattern': r'\s*python-([0-9a-z\.]*)\s*', # 'python-3.6'
+ },
+ ]
+
+ py_version = None
+ for file in files_to_search_in_order:
try:
- with open(self.binder_path('runtime.txt')) as f:
- runtime = f.read().strip()
+ with open(file['path']) as f:
+ for line in f:
+ match = re.match(file['pattern'], line)
+ if not match:
+ continue
+ py_version = match.group(1)
+ break
except FileNotFoundError:
- runtime = ''
+ pass
+ if py_version:
+ break
- if not runtime.startswith('python-'):
- # not a Python runtime (e.g. R, which subclasses this)
- # use the default Python
- self._python_version = self.major_pythons['3']
+ # extract major.minor
+ if py_version:
+ if len(py_version) == 1:
+ self._python_version = self.major_pythons.get(py_version[0])
+ else:
+ # return major.minor
+ self._python_version = '.'.join(py_version.split('.')[:2])
return self._python_version
-
- py_version_info = runtime.split('-', 1)[1].split('.')
- py_version = ''
- if len(py_version_info) == 1:
- py_version = self.major_pythons[py_version_info[0]]
else:
- # get major.minor
- py_version = '.'.join(py_version_info[:2])
- self._python_version = py_version
+ # use the default Python
+ self._python_version = self.major_pythons['3']
return self._python_version
def get_assemble_scripts(self):

Detect python_(full_)version in Pipfile(.lock)

Give priority to Pipfile.lock, then Pipfile, then runtime.txt.