Latest updates from Tony

ProgrammingClassExamples/MacOS versions/7a PSG (Data entry calc using file save retrieve).py

@@ -0,0 +1,67 @@
+#PySimple examples (v 3.9)
+#Tony Crewe
+#Oct 2018 MacOs
+
+import PySimpleGUI as sg
+import os                     
+
+#sg.ChangeLookAndFeel('GreenTan')
+
+sg.SetOptions(background_color = 'LightBlue',
+            element_background_color = 'LightBlue',
+            text_element_background_color = 'LightBlue',
+              font= ('Calibri', 14, 'bold'))   
+
+layout = [
+    [sg.Text('Enter a Name and four Marks')],
+    [sg.Text('Name:', size =(8,1)), sg.InputText(size = (10,1), key = '_name_')],
+     [sg.Text('Mark1:', size =(8,1)), sg.InputText(size = (5,1), key = '_m1_')],
+         [sg.Text('Mark2:', size =(8,1)), sg.InputText(size = (5,1), key = '_m2_')],
+         [sg.Text('Mark3:', size =(8,1)), sg.InputText(size = (5,1), key = '_m3_')],
+         [sg.Text('Mark4:', size =(8,1)), sg.InputText(size = (5,1), key = '_m4_')],
+    [sg.ReadButton('Save', size = (6,1),key = '_save_'),  sg.Text('Press to Save to file')],
+    [sg.ReadButton('Display',size = (6,1), key = '_display_'), sg.Text('To retrieve and Display')],
+    [sg.Multiline(size = (24,4), key = '_multiline_', pad = (2,15))]]
+
+window = sg.Window('Simple Average Finder').Layout(layout)   
+
+
+while True:
+    button, value = window.Read()   #value is a dictionary holding name and marks (4)
+    if button is not None:  
+        #initialise variables
+        total = 0.0
+        index = ''
+        name = value['_name_']
+        #get pathname to current file
+        dirname, filename = os.path.split(os.path.abspath(__file__))
+        #add desired file name for saving to path
+        pathname = os.path.join(dirname , 'results.txt' )                        
+        
+        #needs validation and try/catch error checking, will crash if blank or text entry for marks
+        
+        if button == '_save_':
+            #create dictionary index _m1_ ... _m4_
+            for i in range (1,5):
+                index = '_m' + str(i) + '_'            
+                total += float(value[index])   
+            average = total/4
+            #open file and save
+            f = open(pathname, 'w')                                       
+            print (name, file = f)
+            print (total, file = f)
+            print (average, file = f)
+            f.close()
+
+        #some error checking for missing file needed here
+            
+        if button == '_display_':
+            #This loads the file line by line into a list called data.
+            #the strip() removes whitespaces from beginning and end of each line.
+            data = [line.strip() for line in open(pathname)]
+            #create single string to display in multiline object.
+            string = 'Name:  ' + data[0] +'\nTotal:  ' + str(data[1]) + '\nAverage:  ' + str(data[2])
+            window.FindElement('_multiline_').Update(string)
+    else:
+        break  
+