diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
index 734c188b0048..ccf4b800a614 100644
--- a/lib/matplotlib/backends/backend_pgf.py
+++ b/lib/matplotlib/backends/backend_pgf.py
@@ -241,16 +241,7 @@ def __init__(self):
self._finalize_tmpdir = weakref.finalize(self, self._tmpdir.cleanup)
# test the LaTeX setup to ensure a clean startup of the subprocess
- try:
- self._setup_latex_process(expect_reply=False)
- except FileNotFoundError as err:
- raise RuntimeError(
- f"{self.latex.args[0]!r} not found. Install it or change "
- f"rcParams['pgf.texsystem'] to an available TeX "
- f"implementation.") from err
- except OSError as err:
- raise RuntimeError(
- f"Error starting process {self.latex.args[0]!r}") from err
+ self._setup_latex_process(expect_reply=False)
stdout, stderr = self.latex.communicate("\n\\makeatletter\\@@end\n")
if self.latex.returncode != 0:
raise LatexError(
@@ -258,7 +249,6 @@ def __init__(self):
f"while processing the following input:\n"
f"{self._build_latex_header()}",
stdout)
-
self.latex = None # Will be set up on first use.
# Per-instance cache.
self._get_box_metrics = functools.lru_cache(self._get_box_metrics)
@@ -268,10 +258,19 @@ def _setup_latex_process(self, *, expect_reply=True):
# Windows, we must ensure that the subprocess has quit before being
# able to delete the tmpdir in which it runs; in order to do so, we
# must first `kill()` it, and then `communicate()` with it.
- self.latex = subprocess.Popen(
- [mpl.rcParams["pgf.texsystem"], "-halt-on-error"],
- stdin=subprocess.PIPE, stdout=subprocess.PIPE,
- encoding="utf-8", cwd=self.tmpdir)
+ try:
+ self.latex = subprocess.Popen(
+ [mpl.rcParams["pgf.texsystem"], "-halt-on-error"],
+ stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+ encoding="utf-8", cwd=self.tmpdir)
+ except FileNotFoundError as err:
+ raise RuntimeError(
+ f"{mpl.rcParams['pgf.texsystem']!r} not found; install it or change "
+ f"rcParams['pgf.texsystem'] to an available TeX implementation"
+ ) from err
+ except OSError as err:
+ raise RuntimeError(
+ f"Error starting {mpl.rcParams['pgf.texsystem']!r}") from err
def finalize_latex(latex):
latex.kill()
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