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Commit68c78c9

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Merge pull request#14471 from tacaswell/fix_dont_close_on_noop_switch
FIX: don't close figures if switch_backend is a no-op
2 parentsf2e2f77 +32dd6cc commit68c78c9

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3 files changed

+30
-6
lines changed

3 files changed

+30
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lines changed

‎lib/matplotlib/__init__.py

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1124,6 +1124,10 @@ def use(backend, *, force=True):
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"""
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Select the backend used for rendering and GUI integration.
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If pyplot is already imported, `~matplotlib.pyplot.switch_backend` is used
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and if the new backend is different than the current backend, all Figures
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will be closed.
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Parameters
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----------
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backend : str
@@ -1154,6 +1158,8 @@ def use(backend, *, force=True):
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--------
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:ref:`backends`
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matplotlib.get_backend
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matplotlib.pyplot.switch_backend
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"""
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name=validate_backend(backend)
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# don't (prematurely) resolve the "auto" backend setting

‎lib/matplotlib/pyplot.py

Lines changed: 13 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -210,21 +210,24 @@ def _get_backend_mod():
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defswitch_backend(newbackend):
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"""
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Close all open figures and settheMatplotlib backend.
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Setthepyplot backend.
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The argument is case-insensitive. Switching to an interactive backend is
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possible only if no event loop for another interactive backend has started.
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Switching to and from non-interactive backends is always possible.
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Switching to an interactive backend is possible only if no event loop for
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another interactive backend has started. Switching to and from
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non-interactive backends is always possible.
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If the new backend is different than the current backend then all open
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Figures will be closed via ``plt.close('all')``.
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Parameters
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----------
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newbackend : str
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The name of the backend to use.
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The case-insensitive name of the backend to use.
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"""
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global_backend_mod
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# make sure the init is pulled up so we can assign to it later
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importmatplotlib.backends
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close("all")
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ifnewbackendisrcsetup._auto_backend_sentinel:
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current_framework=cbook._get_running_interactive_framework()
@@ -261,6 +264,8 @@ def switch_backend(newbackend):
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switch_backend("agg")
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rcParamsOrig["backend"]="agg"
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return
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# have to escape the switch on access logic
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old_backend=dict.__getitem__(rcParams,'backend')
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backend_mod=importlib.import_module(
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cbook._backend_module_name(newbackend))
@@ -325,6 +330,8 @@ def draw_if_interactive():
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# Need to keep a global reference to the backend for compatibility reasons.
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# See https://github.com/matplotlib/matplotlib/issues/6092
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matplotlib.backends.backend=newbackend
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ifnotcbook._str_equal(old_backend,newbackend):
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close("all")
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# make sure the repl display hook is installed in case we become
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# interactive

‎lib/matplotlib/tests/test_pyplot.py

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -429,3 +429,14 @@ def test_minor_ticks():
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tick_labels=ax.get_yticklabels(minor=True)
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assertnp.all(tick_pos==np.array([3.5,6.5]))
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assert [l.get_text()forlintick_labels]== ['a','b']
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deftest_switch_backend_no_close():
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plt.switch_backend('agg')
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fig=plt.figure()
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fig=plt.figure()
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assertlen(plt.get_fignums())==2
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plt.switch_backend('agg')
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assertlen(plt.get_fignums())==2
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plt.switch_backend('svg')
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assertlen(plt.get_fignums())==0

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