reticulate 1.25

• Fixed an issue where reticulate would fail if R was running embedded under rpy2.
  reticulate now ensures the Python GIL is acquired before calling into Python.

• Fixed an issue where reticulate would fail to bind to an ArcGIS Pro conda environment
  (#1200, @philiporlando).

• Fixed an issue where reticulate would fail to bind to an Anaconda
  base environment on Windows.

• All commands that create, modify, or delete a Python environment now echo
  the system command about to be executed. Affected:
  virtualenv_{create,install,remove}
  conda_{create,clone,remove,install,update}
  py_install

• install_python() and create_virtualenv() gain the ability to automatically
  select the latest patch of a requested Python version.
  e.g.: install_python("3.9:latest"), create_virtualenv("my-env", version = "3.9:latest")

• install_python() version arg gains default value of "3.9:latest".
  install_python() can now be called with no arguments.

• Fixed an issue where reticulate would fail to bind to a conda python
  if the user didn't have write permissions to the conda installation (#1156).

• Fixed an issue where reticulate would fail to bind to a conda python if
  spaces were present in the file path to the associated conda binary (#1154).

• use_python(, required = TRUE) now issues a warning if the request will be ignored (#1150).

• New function py_repr() (#1157)

• print() and related changes (#1148, #1157):

  • The default print() method for Python objects now invokes py_repr() instead of str().
  • All Python objects gain a default format() method that invokes py_str().
  • py_str() default method no longer strips the object memory address.
  • print() now returns the printed object invisibly, for composability with %>%.

• Exception handling changes (#1142, @t-kalinowski):

  • R error messages from Python exceptions are now truncated differently to satisfy getOption("warning.length").
    A hint to call reticulate::py_last_error() is shown if the exception message was truncated.

  • Python buffers sys.stderr and sys.stdout are now flushed when Python exceptions are raised.

  -py_last_error():

  • Return object is now an S3 object 'py_error', includes a default print method.
  • The python Exception object ('python.builtin.Exception') is available as an R attribute.
  • Gains the ability to restore a previous exception if provided in a call py_last_error(previous_error)
  • Python traceback objects gain a default format() S3 method.

• Fixed py_to_r() for scipy matrices when scipy >= 1.8.0, since sparse matrices
  are now deprecated.

• Fixed r_to_py() for small scipy matrices.

• New maintainer: Tomasz Kalinowski