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- from sympy.external import import_module
- from sympy.testing.pytest import ignore_warnings, raises
- antlr4 = import_module("antlr4", warn_not_installed=False)
- # disable tests if antlr4-python3-runtime is not present
- if antlr4:
- disabled = True
- def test_no_import():
- from sympy.parsing.latex import parse_latex
- with ignore_warnings(UserWarning):
- with raises(ImportError):
- parse_latex('1 + 1')
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