def check_expression(expr, var_symbols, only_from_sympy=False):
"""
Does ``eval(expr)`` both in Sage and SymPy and does other checks.
EXAMPLES::
sage: from sage.interfaces.sympy import check_expression
sage: check_expression("1.123*x", "x")
"""
from sage.symbolic.ring import SR
from sympy import (__dict__ as sympydict, Basic, S, var as svar)
# evaluate the expression in the context of Sage:
if var_symbols:
SR.var(var_symbols)
is_different = False
try:
e_sage = SR(expr)
assert not isinstance(e_sage, Basic)
except (NameError, TypeError):
is_different = True
# evaluate the expression in the context of SymPy:
if var_symbols:
svar(var_symbols)
b = globals().copy()
b.update(sympydict)
assert "sin" in b
b.update(sympydict)
e_sympy = eval(expr, b)
assert isinstance(e_sympy, Basic)
# Sympy func may have specific _sage_ method
if is_different:
_sage_method = getattr(e_sympy.func, "_sage_")
e_sage = _sage_method(S(e_sympy))
# Do the actual checks:
if not only_from_sympy:
assert S(e_sage) == e_sympy
assert e_sage == SR(e_sympy)
def check_expression(expr, var_symbols, only_from_sympy=False):
"""
Does ``eval(expr)`` both in Sage and SymPy and does other checks.
EXAMPLES::
sage: from sage.interfaces.sympy import check_expression
sage: check_expression("1.123*x", "x")
"""
from sage import __dict__ as sagedict
from sage.symbolic.ring import SR
from sympy import (__dict__ as sympydict, Basic, S, var as svar)
# evaluate the expression in the context of Sage:
if var_symbols:
SR.var(var_symbols)
is_different = False
try:
e_sage = SR(expr)
assert not isinstance(e_sage, Basic)
except (NameError, TypeError):
is_different = True
pass
# evaluate the expression in the context of SymPy:
if var_symbols:
sympy_vars = svar(var_symbols)
b = globals().copy()
b.update(sympydict)
assert "sin" in b
b.update(sympydict)
e_sympy = eval(expr, b)
assert isinstance(e_sympy, Basic)
# Sympy func may have specific _sage_ method
if is_different:
_sage_method = getattr(e_sympy.func, "_sage_")
e_sage = _sage_method(S(e_sympy))
# Do the actual checks:
if not only_from_sympy:
assert S(e_sage) == e_sympy
assert e_sage == SR(e_sympy)