Mapytex/pymath/calculus/test/test_expression.py

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#!/usr/bin/env python
# encoding: utf-8
""" Testing Expression """
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from pymath.calculus.expression import Expression
from pymath.calculus.fraction import Fraction
from pymath.calculus.generic import first_elem
from pymath.calculus.render import txt, tex
def test_init_from_str():
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exp = Expression("2 + 3")
assert exp.postfix_tokens == [2, 3, "+"]
def test_init_from_exp():
pass
def test_init_list():
exp = Expression([2, 3, "+"])
assert exp.postfix_tokens == [2, 3, "+"]
def test_init_one_element_int_from_str():
exp = Expression("1")
def test_init_one_element_int_from_list():
exp = Expression([1])
#def test_init_one_element_str_from_str():
# exp = Expression("x")
#
#def test_init_one_element_str_from_list():
# exp = Expression(["x"])
def test_simplify_exp():
exp = Expression("1 + 2 * 3")
simplified = exp.simplify()
ans = Expression("7")
assert ans == simplified
#def test_simplify_frac():
# exp = Expression("1/2 - 4")
# simplified = exp.simplify()
# ans = Expression("-7/2")
# assert simplified == ans
#
#def test_explain_frac():
# exp = Expression("1/2 - 4")
# simplified = exp.simplify()
#
# steps = ['\\frac{ 1 }{ 2 } - 4', \
# '\\frac{ 1 \\times 1 }{ 2 \\times 1 } - \\frac{ 4 \\times 2 }{ 1 \\times 2 }',\
# '\\frac{ 1 }{ 2 } - \\frac{ 8 }{ 2 }',\
# '\\frac{ 1 - 8 }{ 2 }',\
# '\\frac{ -7 }{ 2 }']
# assert simplified.steps == list(exp.simplify())
def test_add_exp():
e = Expression("12- 4")
f = Expression("4 + 1")
g = e + f
assert g.postfix_tokens == [12, 4, '-', 4, 1, "+", "+"]
def test_mul_exp():
e = Expression("12- 4")
f = Expression("4 + 1")
g = e * f
assert g.postfix_tokens == [12, 4, '-', 4, 1, "+", "*"]
def test_neg_exp():
e = Expression("12- 4")
g = -e
assert g.postfix_tokens == [12, 4, '-', '-']
# -----------------------------
# Reglages pour 'vim'
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# cursor: 16 del