def test_drop():
rpn = Rpn()
with pytest.raises(InvalidOperationError):
rpn.drop() # Error
assert rpn.stack == []
rpn.push("1 2")
rpn.drop()
assert rpn.stack == [1.0]
rpn.drop()
assert rpn.stack == []
def test_multiply():
rpn = Rpn()
rpn.push("*") # Error
assert rpn.stack == []
rpn.push("12 3 *")
assert rpn.stack == [36.0]
rpn.push("*") # Error
assert rpn.stack == [36.0]
# Chained operations
rpn.clear()
rpn.push("12 3 * 4 5 *")
assert rpn.stack == [36.0, 20.0]
# Multiply by negative number
rpn.clear()
rpn.push("12 -3 *")
assert rpn.stack == [-36.0]
rpn.push("-2 *")
assert rpn.stack == [72.0]
def test_minus():
rpn = Rpn()
rpn.push("-") # Error
assert rpn.stack == []
rpn.push("12 3 -")
assert rpn.stack == [9.0]
rpn.push("-") # Error
assert rpn.stack == [9.0]
# Chained operations
rpn.clear()
rpn.push("12 3 - 4 5 -")
assert rpn.stack == [9.0, -1.0]
def test_plus():
rpn = Rpn()
rpn.push("+") # Error
assert rpn.stack == []
rpn.push("12 3 +")
assert rpn.stack == [15.0]
rpn.push("+") # Error
assert rpn.stack == [15.0]
# Chained operations
rpn.clear()
rpn.push("12 3 + 4 5 +")
assert rpn.stack == [15.0, 9.0]
def test_get_status():
rpn = Rpn()
assert rpn.get_status() == "The stack is empty."
rpn.push("1 2 3 4")
assert rpn.get_status() == "4.0"
def test_clear():
rpn = Rpn()
rpn.push("12 3 5 7 8")
assert rpn.stack == [12.0, 3.0, 5.0, 7.0, 8.0]
rpn.clear()
assert rpn.stack == []
def test_push_error():
rpn = Rpn()
rpn.push('meuh') # error
assert rpn.stack == []
def test_push_simple():
rpn = Rpn()
assert rpn.stack == []
rpn.push("12")
assert rpn.stack == [12.0]
rpn.push("12 3")
assert rpn.stack == [12.0, 12.0, 3.0]
rpn.push("-4")
assert rpn.stack == [12.0, 12.0, 3.0, -4.0]
rpn = Rpn()
# Commas are interpreted as dots
rpn.push("0 -1.3333 1,4444 0.0001")
assert rpn.stack == [0, -1.3333, 1.4444, 0.0001]
def test_cos():
rpn = Rpn()
rpn.push('cos') #error
assert rpn.stack == []
rpn.clear()
rpn.push('360 cos')
assert rpn.stack == [1.0]
rpn.clear()
rpn.push('0 cos')
assert rpn.stack == [1.0]
def test_sin():
rpn = Rpn()
rpn.push('sin') # error
assert rpn.stack == []
rpn.clear()
rpn.push('90 sin')
assert rpn.stack == [1.0]
rpn.clear()
rpn.push('0 sin') # error
assert rpn.stack == [0.0]
def test_divide():
rpn = Rpn()
rpn.push("/") # Error
assert rpn.stack == []
rpn.push("12 3 /")
assert rpn.stack == [4.0]
rpn.push("/") # Error
assert rpn.stack == [4.0]
# Chained operations
rpn.clear()
rpn.push("12 3 / 4 5 /")
assert rpn.stack == [4.0, .8]
# Divide by negative number
rpn.clear()
rpn.push("12 -3 /")
assert rpn.stack == [-4.0]
rpn.push("-2 /")
assert rpn.stack == [2.0]
# Division by zero
rpn.clear()
rpn.push("42 0 /")
assert rpn.stack == [42.0, 0.]
# -*- coding: utf-8 -*-
import os
from flask import Flask, render_template
from app.forms import DataForm
from app.rpn import Rpn
import time
app = Flask(__name__)
app.config.from_object('config')
rpn = Rpn()
@app.route('/', methods=['GET', 'POST'])
@app.route('/index', methods=['GET', 'POST'])
def index():
form = DataForm()
execution_time = 0
if form.validate_on_submit():
start_time = time.time()
rpn.clear()
rpn.push(form.equation_field.data)
form.result_field.data = rpn.get_status()
form.errors_field.data = rpn.errors
execution_time = time.time() - start_time
return render_template('index.html',
execution_time=execution_time,
title=u'RPN калькулятор',
form=form)