Some weird error using Kivy 1.9.1
Question
I'm trying to use some my python code from a class project for an Kivy app just for practice. I know the code works perfectly fine whether I run in it simply in IDLE or as an IPython notebook, but I'm encountering some weird error when I run the code in kivy app. The following is the Traceback:
Traceback (most recent call last):
File "/home/havik/workspace/kivyapp2.7/main.py", line 215, in <module>
TutorialApp().run()
File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 824, in run
runTouchApp()
File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 487, in runTouchApp
EventLoop.window.mainloop()
File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 539, in mainloop
self._mainloop()
File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 300, in _mainloop
EventLoop.idle()
File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 330, in idle
self.dispatch_input()
File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 315, in dispatch_input
post_dispatch_input(*pop(0))
File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 221, in post_dispatch_input
listener.dispatch('on_motion', etype, me)
File "_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6856)
File "/usr/lib/python2.7/dist-packages/kivy/core/window/__init__.py", line 904, in on_motion
self.dispatch('on_touch_down', me)
File "_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6856)
File "/usr/lib/python2.7/dist-packages/kivy/core/window/__init__.py", line 920, in on_touch_down
if w.dispatch('on_touch_down', touch):
File "_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6856)
File "/usr/lib/python2.7/dist-packages/kivy/uix/screenmanager.py", line 1069, in on_touch_down
return super(ScreenManager, self).on_touch_down(touch)
File "/usr/lib/python2.7/dist-packages/kivy/uix/widget.py", line 382, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6856)
File "/usr/lib/python2.7/dist-packages/kivy/uix/relativelayout.py", line 276, in on_touch_down
ret = super(RelativeLayout, self).on_touch_down(touch)
File "/usr/lib/python2.7/dist-packages/kivy/uix/widget.py", line 382, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6856)
File "/usr/lib/python2.7/dist-packages/kivy/uix/relativelayout.py", line 276, in on_touch_down
ret = super(RelativeLayout, self).on_touch_down(touch)
File "/usr/lib/python2.7/dist-packages/kivy/uix/widget.py", line 382, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6856)
File "/usr/lib/python2.7/dist-packages/kivy/uix/behaviors.py", line 135, in on_touch_down
self.dispatch('on_press')
File "_event.pyx", line 695, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:6815)
File "_event.pyx", line 1168, in kivy._event.EventObservers.dispatch (kivy/_event.c:11690)
File "_event.pyx", line 1052, in kivy._event.EventObservers._dispatch (kivy/_event.c:10730)
File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 1465, in custom_callback
exec(__kvlang__.co_value, idmap)
File "/home/havik/workspace/kivyapp2.7/tutorial.kv", line 27, in <module>
on_press: app.updateDatabase()
File "/home/havik/workspace/kivyapp2.7/main.py", line 125, in updateDatabase
if sheetnames[x-1] == "MegaMillions":
TypeError: unsupported operand type(s) for -: '_ElementStringResult' and 'int'
I also run into the same error for another line in the code, it's when I use this ---> x -= 1.
This error occurs within the updateDatabase(). I can get past the decrement error only by using this --> x = int(x) - 1, otherwise the error persists. If I use this --> sheetnames[int(x)-1] it will overcome the error but I'm not why I have to do it this as x already contains an integer value in the first place. Following pass this particular error the program gives me a list index out of range within the same function for some reason at areas within the function wherever I'm using the code --> sheetnames[x-1].
I tested the function out within Python 3.4 IDLE and IPython Notebook 2.1 and 2.2 and it works perfectly. In case anyone is wondering what I'm IDE I'm using it's the latest version of Eclipse Luna.
The following is the full code for my app:
'''
Created on May 6, 2015
@author: havik
'''
from kivy.app import App
from kivy.uix.scatter import Scatter
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.gridlayout import GridLayout
from kivy.uix.relativelayout import RelativeLayout
from kivy.core.window import Window
from kivy.uix.image import Image
from kivy.graphics import BorderImage
from kivy.graphics import Color, Rectangle, Line
from kivy.uix.button import Button
import random
import matplotlib.pyplot as plt
import pandas as pd
#import pylab as pl
import requests
import openpyxl as xl
#from operator import itemgetter
from collections import Counter
from lxml import html
import numpy as np
class HomeScreen(Screen):
pass
class LotterySelcetionScreen(Screen):
pass
class TableScreen(Screen):
pass
class TutorialApp(App):
screen_manager = None
lotteryName = ''
#function to load the table form the excel file corresponding to the passed sheet name
def loadTable(self, sheetName):
lotteryData = pd.ExcelFile("Lottery databases.xlsx") #grabs and loads the file into memory
df = lotteryData.parse(sheetName) #loads the data table form the corresponding sheetName into the df data frame
return df
#function to display the table
def showTable(self, table):
#get the number of rows the table has
no_of_rows = len(table.index)
#display the table
return table.head(no_of_rows)
#function to display pie charts of a specific column within the database
#table is the database that the function will be working with
#and column is a numberical vaule of which column to get the data from
def printPieChart(self, table, column):
if column == 6:
columnList = table.iloc[:, -1:].values.T.ravel()
else:
columnList = table.iloc[:, (column - 7): (column - 6)].values.T.ravel()
countedList = Counter(columnList)
#set up the size of the pie chart
fig = plt.figure(figsize=[10, 10])
ax = fig.add_subplot(111)
cmap = plt.prism()
#input variables for pie function
slices = [float(v) for v in countedList.values()]
colors = cmap(np.linspace(0., 1., len(slices)))
labels = [float(k) for k in countedList]
columnHeaders = list(table.columns.values)
#the pie chart
pie_wedge_collection = ax.pie(slices, colors = colors, labels = labels, labeldistance = 1.05, autopct = '%1.1f%%')
#get rid of the black outlines between the wedges and around the pie
for pie_wedge in pie_wedge_collection[0]:
pie_wedge.set_edgecolor('white')
ax.set_title(columnHeaders[column + 1])
#can't display a Legends as there's too many for plt.legends() too handle
#return pyplot.pie([float(v) for v in countedList.values()], labels = [float(k) for k in countedList])
def updateDatabase(self):
wb = xl.load_workbook("Lottery databases.xlsx") #load the workbook into memory
#list of the sheet names within the workbook
sheetnames = ["SuperLotto", "MegaMillions", "Powerball"]
days = ["Fri. ", "Wed. ", "Tue. ", "Sat. "] #days the draws on done on
#list of the webpages to use grab the new draws
webPages = ['http://www.calottery.com/play/draw-games/superlotto-plus/winning-numbers', 'http://www.calottery.com/play/draw-games/mega-millions/winning-numbers', 'http://www.calottery.com/play/draw-games/powerball/winning-numbers']
x = 3
while x != 0:
ws = wb.get_sheet_by_name(sheetnames[x-1]) # which sheet to update
rowIndex = ws.get_highest_row() # gets the highest row index in the sheet
#lastCellValue = ws.cell(row = rowIndex - 1, column = 0).value #gets the last value in the first column, draw number
lastCellValue = ws.cell(row = rowIndex, column = 1).value #gets the last value in the first column, draw number, for openpyxl 2.0.0+
page = requests.get(webPages[x-1]) #grabs the webpage needed
tree = html.fromstring(page.text) #puts the webpage into a tree structure to make it easy to traverse
#get the newest draw and date from the webpage for comparasion purposes
draw_and_date = tree.xpath('//*[@id="objBody_content_0_pagecontent_0_objPastWinningNumbers_rptPast_ctl01_lblDrawDateNumber"]/text()')
#if the table is up to date, it will move on to the next table else it will update it
y = int(draw_and_date[0][-4:]) - int(lastCellValue) # checks to see how many draws are missing from the table
if y == 0:
#print("The table for " + sheetnames[x-1] + " is up to date.")
x -= 1 #decrement x by 1 to move on to the next table
else:
#while loop to check if the table needs to be updated or not, if yes it will update it
while y != 0:
#grabs the draw and date of the missing draws from the table
draw_and_date = tree.xpath('//*[@id="objBody_content_0_pagecontent_0_objPastWinningNumbers_rptPast_ctl0' + str(y) + '_lblDrawDateNumber"]/text()')
numbers = tree.xpath(".//*[@id='content']/div[3]/table/tr[" + str(y) + "]/td[2]/span/text()") #numbers
numbers = [int(x) for x in numbers] # converts the text to integers
numbers.sort() #sort the number from smallest to largest
mega = tree.xpath(".//*[@id='content']/div[3]/table/tr[" + str(y) + "]/td[3]/text()") #mega number
mega = int(mega[0]) # converts the text to integers
#write to the file
if sheetnames[x-1] == "MegaMillions":
d = 0
else:
d = 1
if int(draw_and_date[0][-4:]) % 2 == 0:
# if the draw date is even then the day is a Tuesday/Saturday
ws.append([int(draw_and_date[0][-4:]), (days[d+2] + draw_and_date[0][:12]), numbers[0], numbers[1], numbers[2], numbers[3], numbers[4], mega]) # print the draw date
else:
# if the draw date is odd then the day is a Wednesday/Friday
ws.append([int(draw_and_date[0][-4:]), (days[d] + draw_and_date[0][:12]), numbers[0], numbers[1], numbers[2], numbers[3], numbers[4], mega])
y -= 1 #decrement y by 1 to get the next missing draw
#print("Updated the " + sheetnames[x-1] + " table successfully!")
x -= 1 #decrement x by 1 to move on to the next table
wb.save("Lottery databases.xlsx") #save the workbook
#print("Saved the database Sucessfully!")
# function to get a list of the occurring numbers in each column
# 6 for the first number columns or 1 for the mega/powerball column
def getPopularList(self, table, x):
popular_list = list()
if x != 1:
while x != 0:
column_list = table.iloc[:, (0 - x): (1 - x)].values.T.ravel() # the all of the values in the column
counted_list = Counter(column_list) # counts how many time each value occurs within the column
top_five = counted_list.most_common(5) # the top five within the column
top_five.sort() # sorts the top five
popular_list = popular_list + top_five
x -= 1 # decrement x by 1
else:
column_list = table.iloc[:, (0 - x):].values.T.ravel() # the all of the values in the column
counted_list = Counter(column_list) # counts how many time each value occurs within the column
top_ten = counted_list.most_common(10) # the top five within the column
top_ten.sort() # sorts the top five
popular_list = popular_list + top_ten
#popular_list is actually a tuple of list which contains the value and how many times that value occured
#but we only want the values by themselves
popular_list_values = [y[0] for y in popular_list] #this gives us a list of the values
return popular_list_values
# Function to generate a ticket based on the popular numbers in the lottery
def generate_ticket(self, table):
firstFive = self.getPopularList(table, 6) # get the popular numbers for the first five slots
mega = self.getPopularList(table, 1) # gets the popular numbers for the mega/powerball slot
five = self.getNumbers(firstFive, 5) # gets first five numbers for the ticket
one = self.getNumbers(mega, 1) #gets the mega/powerball for the ticket
five.append(one)
return five
#function to get numbers
def getNumbers(self, numbers_list, x):
numbers = list() #empty list
rand_range_list = list(range(0, len(numbers_list))) #list of the numbers to choice from at random
if x != 1:
while x != 0:
y = random.choice(rand_range_list) #pick a number
#it's not making the list properly at the moment, FIX IT!
#numbers = numbers + numbers_list[y] #add a number to our list to return
numbers.append(numbers_list[y]) #append the number to the end of the list
rand_range_list.remove(y) #remove y from our rand_range_list to prevent any repeats
x -= 1
else:
numbers = random.choice(numbers_list) # add a number to our list to return
return numbers
# function to print the ticket based on which lottery it's from
def printTicket(self, ticket, lottery):
#small bubblesort for the first five numbers
for x in range(1, 5):
for y in range(0, 4):
if ticket[y] > ticket[y + 1]:
temp = ticket[y]
ticket[y] = ticket[y + 1]
ticket[y + 1] = temp
#print statements depending on the lottery
#print the ticket without any brackets
if lottery != "Powerball":
return str(ticket)[1:-4] + " Mega " + str(ticket[-1])
else:
return str(ticket)[1:-4] + " Powerball " + str(ticket[-1])
def build(self):
#Window.clearcolor = (1,1,1,1)
self.screen_manager = ScreenManager()
self.screen_manager.add_widget(HomeScreen(name='home'))
self.screen_manager.add_widget(LotterySelcetionScreen(name='lottery_selection'))
self.screen_manager.add_widget(TableScreen(name='table'))
return self.screen_manager
if __name__ == '__main__':
TutorialApp().run()
Here's the kv file:
<HomeScreen>:
RelativeLayout:
Image:
source: 'images/background3.jpg'
size_hint: None, None
size: self.texture_size
pos: self.pos
Button:
id: selectButton
font_size: sp(30)
text: 'Select Lottery'
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
pos: root.width / 2 - (self.width / 2), root.height / 2
on_press: root.manager.current = 'lottery_selection'
Button:
id: updateButton
font_size: sp(30)
text: 'Update Databases'
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
pos: root.width / 2 - (self.width / 2), root.height / 2 - selectButton.height
on_press: app.updateDatabase()
Button:
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
pos: root.width - self.width, 0
font_size: sp(30)
text: 'Quit'
on_press: app.stop()
<LotterySelcetionScreen>:
BoxLayout:
orientation: 'vertical'
Button:
text: 'SuperLotto'
on_press: root.manager.current = 'table'
on_press: app.lotteryName = 'SuperLotto'
Button:
text: 'MegaMillions'
on_press: root.manager.current = 'table'
on_press: app.lotteryName = 'MegaMillions'
Button:
text: 'Powerball'
on_press: root.manager.current = 'table'
on_press: app.lotteryName = 'Powerball'
Button:
text: 'Back to home'
on_press: root.manager.current = 'home'
pos: root.width - self.width, 0
<TableScreen>:
RelativeLayout:
Image:
source: 'images/background3.jpg'
size_hint: None, None
size: self.texture_size
pos: self.pos
Button:
id: homeButton
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
pos: root.width - self.width - quitButton.width, 0
font_size: sp(30)
text: 'Back to home'
on_press: root.manager.current = 'home'
on_press: label1.text = ''
on_press: label2.text = ''
Button:
id: quitButton
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
pos: root.width - self.width, 0
font_size: sp(30)
text: "Quit"
on_press: app.stop()
Label:
id:label1
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
font_size: sp(21)
pos: (root.width / 2) - (self.width / 2), root.height / 2
color: 1,.17,.17,1
Label:
id:label2
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
font_size: sp(21)
pos: (root.width / 2) - (self.width / 2), (root.height / 2) - label1.height
color: 1,.17,.17,1
Button:
id: newButton
text: 'New Ticket'
size_hint_x: None
width: self.texture_size[0]
size_hint_y: None
height: self.texture_size[1]
font_size: sp(30)
pos: root.width - self.width - quitButton.width - homeButton.width, 0
on_press: label1.text=str(app.generate_ticket(app.loadTable(app.lotteryName)))[1:-1]
on_press: label2.text = ""
on_press: label1.font_size = sp(30)
Button:
id: listButton
text: 'Popular Numbers'
size_hint_x: None
size_hint_y: None
width: self.texture_size[0]
height: self.texture_size[1]
font_size: sp(30)
pos: root.width - self.width - quitButton.width - homeButton.width - newButton.width, 0
on_press: label1.text = str(app.getPopularList(app.loadTable(app.lotteryName), 6))[1:-1]
on_press: label1.font_size = sp(21)
on_press: label2.text = str(app.getPopularList(app.loadTable(app.lotteryName), 1))[1:-1]
1 answers
solution1
1 ACCPTED 2015-06-10 04:00:03
Your issue is python's scoping rules, and this line in the updateDatabase method:
numbers = [int(x) for x in numbers] # converts the text to integers
It re-assigns the local variable x within this list comprehension. After this line, x will be the text of whatever the last item in numbers is. Just use another variable here to fix.
A good Python idiom is to use _ for a variable name in constructs like list comprehensions where you just need a variable for a bit, and don't care about its value after. So:
numbers = [int(_) for _ in numbers] # converts the text to integers
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