precice · MakisH · Nov 18, 2025 · Nov 12, 2025 · Nov 17, 2025 · Nov 18, 2025
diff --git a/changelog-entries/680.md b/changelog-entries/680.md
@@ -0,0 +1 @@
+- Added the `PRECICE_TUTORIALS_NO_VENV` environment variable to skip the setup of a Python venv in the run.sh scripts of Python-related tutorials [#680](https://github.com/precice/tutorials/pull/680)
diff --git a/channel-transport-reaction/chemical-fenics/run.sh b/channel-transport-reaction/chemical-fenics/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-package .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-package .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 chemical-reaction-advection-diffusion.py
 

diff --git a/channel-transport-reaction/fluid-fenics/run.sh b/channel-transport-reaction/fluid-fenics/run.sh
@@ -4,10 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-package .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
-
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-package .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 fluid.py
 

diff --git a/channel-transport/fluid-nutils/run.sh b/channel-transport/fluid-nutils/run.sh
@@ -4,9 +4,13 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
+
 python3 fluid.py
 
 close_log
diff --git a/channel-transport/transport-nutils/run.sh b/channel-transport/transport-nutils/run.sh
@@ -4,9 +4,13 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
+
 python3 transport.py "$@"
 
 close_log
diff --git a/elastic-tube-1d/fluid-python/run.sh b/elastic-tube-1d/fluid-python/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 ./FluidSolver.py ../precice-config.xml
 

diff --git a/elastic-tube-1d/solid-python/run.sh b/elastic-tube-1d/solid-python/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 ./SolidSolver.py ../precice-config.xml
 

diff --git a/elastic-tube-3d/solid-fenics/run.sh b/elastic-tube-3d/solid-fenics/run.sh
@@ -4,8 +4,11 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-package .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-package .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 solid.py
diff --git a/flow-around-controlled-moving-cylinder/controller-fmi/run.sh b/flow-around-controlled-moving-cylinder/controller-fmi/run.sh
@@ -15,9 +15,12 @@ if [ ! -f PIDcontroller.fmu ]; then
   cd ../../
 fi
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 fmiprecice ./fmi-settings.json ./precice-settings.json
 

diff --git a/flow-around-controlled-moving-cylinder/solid-python/run.sh b/flow-around-controlled-moving-cylinder/solid-python/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 solid.py ../precice-config.xml
 

diff --git a/flow-over-heated-plate/fluid-su2/run.sh b/flow-over-heated-plate/fluid-su2/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-package .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 SU2_preCICE_CHT.py -f laminar_config_unsteady.cfg -r --parallel
 

diff --git a/flow-over-heated-plate/solid-dunefem/run.sh b/flow-over-heated-plate/solid-dunefem/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 python3 solid.py
 
 close_log
diff --git a/flow-over-heated-plate/solid-fenics/run.sh b/flow-over-heated-plate/solid-fenics/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-package .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 python3 solid.py
 

diff --git a/flow-over-heated-plate/solid-nutils/run.sh b/flow-over-heated-plate/solid-nutils/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 python3 solid.py
 
 close_log
diff --git a/oscillator/mass-left-fmi/run.sh b/oscillator/mass-left-fmi/run.sh
@@ -16,9 +16,12 @@ if [ ! -f ../solver-fmi/Oscillator.fmu ]; then
   cd ../../../mass-left-fmi
 fi
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 fmiprecice fmi-settings.json precice-settings.json
 python3 ../solver-fmi/calculate-error.py ../mass-left-fmi/fmi-settings.json ../mass-left-fmi/precice-settings.json ../mass-right-fmi/fmi-settings.json ../mass-right-fmi/precice-settings.json Mass-Left

diff --git a/oscillator/mass-right-fmi/run.sh b/oscillator/mass-right-fmi/run.sh
@@ -16,9 +16,12 @@ if [ ! -f ../solver-fmi/Oscillator.fmu ]; then
   cd ../../../mass-right-fmi
 fi
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 fmiprecice fmi-settings.json precice-settings.json
 python3 ../solver-fmi/calculate-error.py ../mass-left-fmi/fmi-settings.json ../mass-left-fmi/precice-settings.json ../mass-right-fmi/fmi-settings.json ../mass-right-fmi/precice-settings.json Mass-Right

diff --git a/partitioned-heat-conduction-complex/dirichlet-fenics/run.sh b/partitioned-heat-conduction-complex/dirichlet-fenics/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-packages .venv
+    . .venv/bin/activate
+    pip install -r ../solver-fenics/requirements.txt
+fi
 
 python3 ../solver-fenics/heat.py -d -i complex
 

diff --git a/partitioned-heat-conduction-complex/neumann-fenics/run.sh b/partitioned-heat-conduction-complex/neumann-fenics/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-packages .venv
+    . .venv/bin/activate
+    pip install -r ../solver-fenics/requirements.txt
+fi
 
 python3 ../solver-fenics/heat.py -n -i complex
 

diff --git a/partitioned-heat-conduction-direct/dirichlet-nutils/run.sh b/partitioned-heat-conduction-direct/dirichlet-nutils/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 rm -rf Dirichlet-*.vtk
 NUTILS_RICHOUTPUT=no python3 heat.py

diff --git a/partitioned-heat-conduction-direct/neumann-nutils/run.sh b/partitioned-heat-conduction-direct/neumann-nutils/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 rm -rf Neumann-*.vtk
 NUTILS_RICHOUTPUT=no python3 heat.py

diff --git a/partitioned-heat-conduction-overlap/left-fenics/run.sh b/partitioned-heat-conduction-overlap/left-fenics/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-packages .venv
+    . .venv/bin/activate
+    pip install -r ../solver-fenics/requirements.txt
+fi
 
 python3 ../solver-fenics/heat.py Left
 

diff --git a/partitioned-heat-conduction-overlap/right-fenics/run.sh b/partitioned-heat-conduction-overlap/right-fenics/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-packages .venv
+    . .venv/bin/activate
+    pip install -r ../solver-fenics/requirements.txt
+fi
 
 python3 ../solver-fenics/heat.py Right
 

diff --git a/partitioned-heat-conduction/dirichlet-fenics/run.sh b/partitioned-heat-conduction/dirichlet-fenics/run.sh
@@ -1,9 +1,12 @@
 #!/usr/bin/env bash
 set -e -u
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-packages .venv
+    . .venv/bin/activate
+    pip install -r ../solver-fenics/requirements.txt
+fi
 
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1

diff --git a/partitioned-heat-conduction/dirichlet-nutils/run.sh b/partitioned-heat-conduction/dirichlet-nutils/run.sh
@@ -4,9 +4,12 @@ set -e -u
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv .venv
-. .venv/bin/activate
-pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv .venv
+    . .venv/bin/activate
+    pip install -r requirements.txt && pip freeze > pip-installed-packages.log
+fi
 
 rm -rf Dirichlet-*.vtk
 NUTILS_RICHOUTPUT=no python3 heat.py

diff --git a/partitioned-heat-conduction/neumann-fenics/run.sh b/partitioned-heat-conduction/neumann-fenics/run.sh
@@ -1,16 +1,15 @@
 #!/usr/bin/env bash
 set -e -u
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
-
 . ../../tools/log.sh
 exec > >(tee --append "$LOGFILE") 2>&1
 
-python3 -m venv --system-site-packages .venv
-. .venv/bin/activate
-pip install -r ../solver-fenics/requirements.txt
+if [ -z "${PRECICE_TUTORIALS_NO_VENV:-}" ]
+then
+    python3 -m venv --system-site-packages .venv
+    . .venv/bin/activate
+    pip install -r ../solver-fenics/requirements.txt
+fi
 
 python3 ../solver-fenics/heat.py Neumann
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		- Added the `PRECICE_TUTORIALS_NO_VENV` environment variable to skip the setup of a Python venv in the run.sh scripts of Python-related tutorials [#680](https://github.com/precice/tutorials/pull/680)
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