我是Tkinter的新手。尝试使用以下方法将我的多个tkinter GUI的用户输入写入Excel文件,但是最新值仍然被覆盖。我无法将以前的输入值从用户保留到Excel。在这里请求您的帮助。我已经使用numofvm()创建了多个tkinter窗口,因此将创建GUI,然后在用户通过GUI输入值之后。
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答案 0 :(得分:1)
正如我在评论中解释的那样,数据写入问题是因为您需要存储StringVar
,而相关信息是list
s,而不是仅使用单个值来覆盖以前的值变量。
尽管不这样做就可以修复,但是您使用了如此多的全局变量会使代码难以理解,调试和修改,这都是人们普遍认为尽可能避免使用它们的原因。
以下是您的问题中的代码使用的列表:
cluster_name
,clustername_entry
,vm_template
,vmdetails_screen
,
invalid_value_screen
,numofvm_screen
,vmnumber
,vmnumber_entry
,
N
,main_screen
由于数量很多,因此我决定在下面的代码中也消除它们,以使设计“更整洁”,除了仅按照建议显示如何将数据存储在list
中。希望这将为您继续开发应用程序提供更好的基础。
为避免使用global
,大多数变量已变成代表整个应用程序的类的属性,该属性是基于this answer并由tkinter提出tkinter
问题的设计大师@Bryan Oakley。
from tkinter import *
import tkinter.messagebox as tkMessageBox
import os
import xlwt
class MyApp(Tk):
LABEL_BG = "light blue"
def __init__(self):
Tk.__init__(self)
self.geometry("300x250")
self.title("Welcome")
Label(text="Select Your Choice", bg=self.LABEL_BG, width="300", height="2",
font=("Calibri", 13)).pack()
Label(text="").pack()
Button(text="Enter", height="2", width="30", command=self.numofvm).pack()
Label(text="").pack()
def numofvm(self):
""" Designing window to provide the number of VMs to be created. """
self.numofvm_screen = Toplevel(self)
self.numofvm_screen.title("VM_NUM")
self.numofvm_screen.geometry("300x250")
self.vmnumber = StringVar()
Label(self.numofvm_screen,
text="Please enter the Number of VMs you wishes to create",
bg=self.LABEL_BG).pack()
Label(self.numofvm_screen, text="").pack()
vmnumber_lable = Label(self.numofvm_screen,
text="Number of VMs to be created:")
vmnumber_lable.pack()
self.vmnumber_entry = Entry(self.numofvm_screen, textvariable=self.vmnumber)
self.vmnumber_entry.pack()
Button(self.numofvm_screen, text="Submit", width=10, height=1,
command=self.screen_duplicate).pack()
self.numofvm_screen.focus_set()
def screen_duplicate(self):
try:
self.N = int(self.vmnumber.get())
except ValueError:
self.N = 0
if self.N > 0:
self.vm_details()
def vm_details(self):
""" Create designing windows for VM details.
"""
# Preallocate and then create VM detail screens and data.
self.cluster_names = [None for _ in range(self.N)]
self.clustername_entries = [None for _ in range(self.N)]
self.vm_templates = [None for _ in range(self.N)]
self.vmdetails_screen = [None for _ in range(self.N)]
for i in range(self.N):
numb = str(i+1)
self.vmdetails_screen[i] = Toplevel()
self.vmdetails_screen[i].title("VM Details " + numb)
self.vmdetails_screen[i].geometry("400x950")
# Set text variables
self.cluster_names[i] = StringVar()
self.vm_templates[i] = StringVar()
# Set label for user's instruction
Label(self.vmdetails_screen[i], text="Please enter details below:",
bg=self.LABEL_BG).pack()
Label(self.vmdetails_screen[i], text="").pack()
Cluster_Name_lable = Label(self.vmdetails_screen[i],
text="Cluster Name "+ numb + ":")
Cluster_Name_lable.pack()
# Set textvariables entry
self.clustername_entries[i] = Entry(self.vmdetails_screen[i],
textvariable=self.cluster_names[i])
self.clustername_entries[i].pack()
Button(self.vmdetails_screen[i], text="Submit", width=10, height=1,
command=self.validate).pack()
def validate(self):
""" Check values of ALL cluster name entries and save them to excel
file if they're all valid.
"""
if not all(cluster_name.get() for cluster_name in self.cluster_names):
self.invalid_value()
else:
self.write_to_xls()
tkMessageBox.showinfo("Info", '"%s" file written' % self.xls_filepath)
# Get rid of all data entry screens.
for i in range(self.N):
self.vmdetails_screen[i].destroy()
self.numofvm_screen.destroy()
def invalid_value(self):
""" Display error message screen.
"""
self.invalid_value_screen = Toplevel()
self.invalid_value_screen.title("Invalid Entry")
self.invalid_value_screen.geometry("400x100")
Label(self.invalid_value_screen,
text="Please enter valid values for the fields in ALL\n"
"VM Detail windows before clicking Submit button").pack()
Button(self.invalid_value_screen, text="OK",
command=lambda: self.invalid_value_screen.destroy()).pack()
def write_to_xls(self):
""" Export all user's inputs to an excel sheet. """
# Create new workbook.
wb = xlwt.Workbook()
for i in range(self.N):
numb = str(i+1)
# Add sheet using given name.
ws = wb.add_sheet("VM_" + numb + "_DETAILS")
# Write text to cell.
ws.write(0, 0, "Cluster_Name")
ws.write(1, 0, self.cluster_names[i].get())
# Save excel file in same directory as script.
self.xls_filepath = os.path.join(os.path.dirname(__file__), 'my_file.xls')
wb.save(self.xls_filepath)
if __name__ == '__main__':
root = MyApp()
root.mainloop()