Programming course with PySimpleGUI lessons

ProgrammingClassExamples/1d PSG (named input keys and catch errors).py

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+#PySimple examples (v 3.8)
+#Tony Crewe
+#Sep 2018
+
+import PySimpleGUI as sg
+
+sg.SetOptions (background_color = 'LightBlue',
+            element_background_color = 'LightBlue',
+            text_element_background_color = 'LightBlue',
+               font = ('Arial', 10, 'bold'),
+               text_color = 'Blue',
+               input_text_color ='Blue',
+               button_color = ('White', 'Blue')
+               )
+#name inputs (key) uses dictionary- easy to see updating of results
+#value[input] first input value te c...
+layout = [ [sg.Text('Enter a Temperature in Celcius')],
+    [sg.Text('Celcius', size =(8,1)), sg.InputText(size = (15,1),key = 'input')],
+    [sg.Text('Result', size =(8,1)), sg.InputText(size = (15,1),key = 'result')],
+    [sg.ReadButton('Submit', bind_return_key = True)]]  
+
+window = sg.FlexForm('Temp Converter').Layout(layout) 
+
+while True:
+    button, value = window.Read() 
+    if button is not None:        
+        #catch program errors for text or blank entry:
+        try:
+            fahrenheit = round(9/5*float(value['input']) +32, 1)
+            window.FindElement('result').Update(fahrenheit)     #put result in text box
+        except ValueError:
+            sg.Popup('Error','Please try again')                #display error
+       
+    else:
+        break