26 lines
803 B
Python
26 lines
803 B
Python
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from sympy.core.singleton import S
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from sympy.core.symbol import symbols
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from sympy.parsing.ast_parser import parse_expr
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from sympy.testing.pytest import raises
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from sympy.core.sympify import SympifyError
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import warnings
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def test_parse_expr():
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a, b = symbols('a, b')
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# tests issue_16393
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assert parse_expr('a + b', {}) == a + b
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raises(SympifyError, lambda: parse_expr('a + ', {}))
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# tests Transform.visit_Constant
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assert parse_expr('1 + 2', {}) == S(3)
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assert parse_expr('1 + 2.0', {}) == S(3.0)
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# tests Transform.visit_Name
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assert parse_expr('Rational(1, 2)', {}) == S(1)/2
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assert parse_expr('a', {'a': a}) == a
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# tests issue_23092
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with warnings.catch_warnings():
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warnings.simplefilter('error')
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assert parse_expr('6 * 7', {}) == S(42)
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