Latest updates from Tony

ProgrammingClassExamples/MacOS versions/1e PSG (validation and Look and Feel).py

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+#PySimple examples (v 3.9)
+#Tony Crewe
+#Oct 2018 MacOS
+
+import PySimpleGUI as sg
+
+#Can use a variety of themes - plus individual options
+#Not on MacOS
+#sg.ChangeLookAndFeel('SandyBeach')
+#use set Options see previous
+sg.SetOptions (font = ('Calbri', 12, 'bold'))
+            
+
+layout = [ [sg.Text('Enter a Temperature in Celcius')],
+    [sg.Text('Celcius', size =(8,1)), sg.InputText(size = (6,1),key = '_input_')],
+    [sg.Text('Result', size =(8,1)), sg.InputText(size = (6,1),key = '_result_')],
+    [sg.ReadButton('Submit', bind_return_key = True)]]  
+
+window = sg.Window('Temp Converter').Layout(layout) 
+
+while True:
+    button, value = window.Read() 
+    if button is not None:        
+        #catch program errors for text, floats or blank entry:
+        #Also validation for range [0, 50]
+        try:
+            if float(value['_input_']) > 50 or float(value['_input_']) <0:
+                sg.Popup('Error','Out of range')
+            else:
+                fahrenheit = round(9/5*int(value['_input_']) +32, 1)
+                window.FindElement('_result_').Update(fahrenheit)
+        except ValueError:
+                sg.Popup('Error','Please try again')        
+       
+    else:
+        break