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test_var.py
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test_var.py
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# Tests for var are in their own file, because var pollutes global namespace.
from sympy import Symbol, var
from sympy.utilities.pytest import raises
# make z1 with call-depth = 1
def make_z1():
var("z1")
# make z2 with call-depth = 2
def __make_z2():
var("z2")
def make_z2():
__make_z2()
def test_var():
var("a")
assert a == Symbol("a")
var("b bb cc zz _x")
assert b == Symbol("b")
assert bb == Symbol("bb")
assert cc == Symbol("cc")
assert zz == Symbol("zz")
assert _x == Symbol("_x")
v = var(['d','e','fg'])
assert d == Symbol('d')
assert e == Symbol('e')
assert fg == Symbol('fg')
# check return value
assert v == [d, e, fg]
# see if var() really injects into global namespace
raises(NameError, "z1")
make_z1()
assert z1 == Symbol("z1")
raises(NameError, "z2")
make_z2()
assert z2 == Symbol("z2")
def test_var_return():
v1 = var('')
v2 = var('q')
v3 = var('q p')
assert v1 == None
assert v2 == Symbol('q')
assert v3 == (Symbol('q'), Symbol('p'))
def test_var_accepts_comma():
v1 = var('x y z')
v2 = var('x,y,z')
v3 = var('x,y z')
assert v1 == v2
assert v1 == v3
def test_var_keywords():
var('x y', real=True)
assert x.is_real and y.is_real