python3.8的PySimpleGUI学习的温度转换，℃转℉

一、代码1：

#导出模块
import PySimpleGUI as sg
#总体布局,sg.InputText(),默认size=(45,1)。
layout = [
         [sg.Text('Celcius（摄氏温度）'), sg.InputText(size=(15,1)),sg.Text('℃')], #第1行的3个布局       
         [sg.Submit()], #第2行                               
         ]

#定义窗口即标题
#window = sg.Window('Temperature Converter').Layout(layout) #方法一layout布局
window = sg.Window('Temperature Converter',layout)  #方法二layout布局
#get value (part of a list)
button, value = window.Read() 
#定义按钮                 
if button is None:
    exit(0)
#convert and create string
fahrenheit = round(9/5*float(value[0]) +32, 1)   #公式，1为保留小数点后面1位
result =  'Temperature in Fahrenheit is（华氏温度是）: ' + str(fahrenheit)+'℉' #定义
#display in Popup ，显示popup弹出框
sg.Popup('Result', result)                     

二、代码2：

#导出模块
import PySimpleGUI as sg
#自定义颜色，有点麻烦，也可以默认主题色，或者设置总体主题色
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') #按钮颜色，白色字，蓝色背景颜色
               )
#总体布局
layout = [
         [sg.Text('Celcius（摄氏温度：）', size =(18,1)), sg.InputText(size = (15,1)),sg.Text('℃')],
         [sg.Submit()]
         ]
#定义窗口即标题
#window = sg.Window('Temperature Converter').Layout(layout) #方法一layout布局
window = sg.Window('Temperature Converter',layout)  #方法二layout布局
#读出win的数值 
button, value = window.Read()
#定义按钮
if button is None:
    exit(0)
#convert and create string
fahrenheit = round(9/5*float(value[0]) +32, 1)   #公式，1为保留小数点后面1位
result =  'Temperature in Fahrenheit is（华氏温度是）: ' + str(fahrenheit)+'℉' #定义
#display in Popup ，显示popup弹出框
sg.Popup('Result', result)                     

三、代码3：

#导出模块
import PySimpleGUI as sg
#自定义颜色
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')
               )
#update (via list) values and and display answers
#value[0] is celcius input, value[1] is input to place result.
#Use ReadButton with while true: - keeps window open.
#认识persistent form and bind key的学习

layout = [ 
         [sg.Text('Enter a Temperature in Celcius')],
         [sg.Text('Celcius', size =(8,1)), sg.InputText(size = (15,1))],
         [sg.Text('Result', size =(8,1)), sg.InputText(size = (15,1))],
         [sg.ReadButton('Submit', bind_return_key = True)]
         ]
#Return = button press
window = sg.Window('Converter').Layout(layout) 

while True:
    #get result
    button, value = window.Read()
    #break out of loop is button not pressed.
    if button is not None:         
        fahrenheit = round(9/5*float(value[0]) +32, 1)
        #put result in 2nd input box
        window.FindElement(1).Update(fahrenheit)  
          
    else:
        break

四、代码4：

#导出模块
import PySimpleGUI as sg
#自定义颜色
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...
#学习named input keys and catch errors

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)
            #put result in text box
            window.FindElement('_result_').Update(fahrenheit)    
        except ValueError:
            sg.Popup('Error','Please try again')        
    else:
        break

五、代码5：

#导出模块
import PySimpleGUI as sg
#个性化设置，可以不设置，那就是默认的银河灰
#Can use a variety of themes - plus individual options
sg.ChangeLookAndFeel('SandyBeach')    
sg.SetOptions (font = ('Arial', 10, 'bold'))          
#布局
layout = [ 
         [sg.Text('Enter a Temperature in Celcius')], #第1行
         [sg.Text('Celcius', size =(8,1)), sg.InputText(size = (15,1),key = '_input_')], #第2行
         [sg.Text('Result', size =(8,1)), sg.InputText(size = (15,1),key = '_result_')], #第3行
         [sg.ReadButton('Submit', bind_return_key = True)]  #第4行
         ]  
#定义窗口的标题和布局
window = sg.Window('Temp Converter').Layout(layout) 
#循环设置
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]，这是多指人体的温度范围，当然35℃都考虑低温了，很危险。
        #input的key值的学习
        #validation（验证） and look and feel的学习
        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) #FindElement和Update的学习
        except ValueError:
                sg.Popup('Error','Please try again')        
       
    else:
        break

总结：

这是一个温度转换的Python的代码，用PySimpleGUI编写，注意其中几个不同之处。

1.layout的布局学习及在Window中的方式。

2.自定义背景颜色和默认背景颜色。

3.FindElement和Update的学习。

4.input的key值的学习。

5.validation（验证） and look and feel的学习。