如何将输入字符串转换为int或float？

Question

如何将输入字符串转换为数值int或float值

#========================= Imports files and Widgets 
#===================================================================

from tkinter import *

#========================= Main Window Size 
main_window = Tk()
main_window.title("Entry Input Test")

width = 400
height = 200
main_window.geometry(str(width) + "x" + str(height) + "+600+520")
main_frame=Frame(main_window)

################ Varibles 

VarWidthECC = 20

################ Input Boxes 

如何将输入字符串转换为int或float值

First_Value=Label(main_frame,text="Enter First Value ")
First_Value.grid(row=10,column=5, padx=10, sticky=E)
First_Value=(Entry(main_frame, width=VarWidthECC, justify='right'))
#First_Value=Input(main_frame, width=VarWidthECC, justify='right')
First_Value.grid(row=10,column=6, padx=10, pady=0)

Second_Value=Label(main_frame,text="Enter Second Value ")
Second_Value.grid(row=20,column=5, padx=10, sticky=E)
Second_Value=Entry(main_frame, width=VarWidthECC, justify = 'right')
#Second_Value=Input(main_frame, width=VarWidthECC, justify = 'right')
Second_Value.grid(row=20,column=6, padx=20, pady=10)

################ Comparison Function 

def Enter_Button():

    #global First_Value, Second_Value

    print("First Value is: " + First_Value.get())
    print("Second Value is: " + Second_Value.get())
    #value = int(First_Value)
    print(type(First_Value))

如何将输入字符串转换为数值int或float值

    #Multiply_test = int(First_Value) * 5  #this line of code is Error
    #How can I convert Entry string into int or float??

下面的乘法测试有效 乘法检验=6*6 打印（“Multiply\u test is:”+str（Multiply\u test））

################ Run Button ####################################
button_enter = Button(main_frame, width=20, background="light grey", 
text=" Enter ", font="Verdana 10 bold", command=Enter_Button, bd=6, 
relief='raise')
button_enter.grid(row=100, column=6, padx=10, pady=5)

####################################################

main_frame.grid(row=0,column=0)       # Prints out Labels on Main Window
main_window.mainloop()                # Code to End Main Window (root)

Answer 1

使用.get()方法以字符串的形式给出条目的输入。您正试图将tkinter条目转换为float/int，但忘记使用get方法。你知道吗

用这个替换Enter_Button()，然后尝试：

def Enter_Button():

    #global First_Value, Second_Value

    print("First Value is: " + First_Value.get())
    print("Second Value is: " + Second_Value.get())
    #value = int(First_Value)
    print(type(First_Value.get()))   #< Use get method as you used it above
    print(type(int(First_Value.get())))
    print(type(float(First_Value.get())))