我有一个项目，当我运行代码时，我没有任何错误，但我得到了这个问题。当我在Entry小部件上输入我的excel CSV文件的路径时，我点击阅读和显示，但是课程或过滤的课程没有显示，你能帮我解决这个问题吗?
import tkinter as tk
import csv
from tkinter import messagebox
from tkinter import ttk
all_courses = []
def read_csv(path):
# use the csv module to read the contents of the file at the provided path
with open(path, newline='', encoding='utf-8') as csvfile:
data = csv.reader(csvfile)
all_courses.extend([row for row in data])
display_courses()
def filter_courses(all_courses, year, code):
# filter the courses based on the selected year and/or code
filtered_courses = []
for course in all_courses:
if (year in course[1] or year == "") and (code in course[0] or code == ""):
filtered_courses.append(course)
return filtered_courses
def add_course(course, timetable=None):
# add the selected course to the timetable
timetable.append(course)
print("Added course:", course)
def remove_course(course, timetable=None):
# remove the selected course from the timetable
timetable.remove(course)
print("Removed course:", course)
def clear_timetable(timetable=None):
# clear the timetable
timetable.clear()
print("Timetable cleared.")
def save_timetable(timetable=None):
# use the csv module to write the timetable to a new file
with open("timetable.csv", "w", newline='', encoding='utf-8') as f:
writer = csv.writer(f)
writer.writerows(timetable)
print("Timetable saved.")
def display_courses(all_courses=None):
filtered_courses = filter_courses(all_courses, year_var.get(), code_var.get())
courses_list.delete(0, tk.END)
for course in filtered_courses:
courses_list.insert(tk.END, course)
# add a warning message for when the user doesn't choose a file path
def display_warning():
if not file_path_entry.get():
messagebox.showwarning("Warning", "Please select a file path first")
display_button.config(command=lambda: [display_courses(all_courses), display_warning()])
# create a GUI window
root = tk.Tk()
root.title("Timetable Tool")
# create an Entry widget to accept the input csv file path
file_path_label = tk.Label(root, text="Input File Path:")
file_path_label.pack()
file_path_entry = tk.Entry(root,)
file_path_entry.pack()
file_path_entry.pack()
# create a button to read the contents of the input file
read_button = tk.Button(root, text="Read", command=lambda: read_csv(file_path_entry.get()))
read_button.pack()
# create a button to display the filtered courses
display_button = tk.Button(root, text="Display", command=lambda: display_courses(all_courses))
display_button.pack()
# create a ComboBox widget to allow the user to select the year and code
year_label = tk.Label(root, text="Year:")
year_label.pack()
year_var = tk.StringVar()
year_var.set("")
year_dropdown = tk.OptionMenu(root, year_var, "1", "2", "3", "4","5")
year_dropdown.pack()
code_label = tk.Label(root, text="Code:")
code_label.pack()
code_var = tk.StringVar()
code_var.set("")
code_dropdown = tk.OptionMenu(root, code_var,"CHI" ,"CS","ECE","ECON","EE", "EECS","ENGR","FRE","IE","ISE","LIFE",
"MATH", "MGT", "UNI")
code_dropdown.pack()
# create a Label widget for the "Courses" box
courses_label = tk.Label(root, text="Courses:")
courses_label.pack()
# create a Listbox widget to display the filtered courses
courses_list = tk.Listbox(root)
courses_list.pack()
# create a Label widget for the "Selected Courses" box
selected_courses_label = tk.Label(root, text="Selected Courses:")
selected_courses_label.pack()
# create a Listbox widget to display the selected courses
selected_courses_list = tk.Listbox(root)
selected_courses_list.pack()
# create buttons to add and remove courses from the timetable
add_button = tk.Button(root, text="Add", command=lambda: add_course(courses_list.get(courses_list.curselection())))
add_button.pack()
remove_button = tk.Button(root, text="Remove", command=lambda: remove_course(courses_list.get(courses_list.curselection(
))))
remove_button.pack()
# create a button to clear the timetable
clear_button = tk.Button(root, text="Clear", command=clear_timetable)
clear_button.pack()
# create a button to save the timetable to a new file
save_button = tk.Button(root, text="Save", command=save_timetable)
save_button.pack()
s = ttk.Style()
s.theme_use("clam")
courses_list.configure(background='yellow')
selected_courses_list.configure(background='blue')
# run the GUI
root.mainloop()
我试着激活这个功能，但是没有成功。
read_csv
def read_csv(path):
您在read_csv()中调用了display_courses()而没有参数，因此display_courses中的all_courses被设置为None，这将在执行filter_courses(all_courses, ...)时引发异常。
在read_csv()内传递all_courses到display_courses():
def read_csv(path):
# use the csv module to read the contents of the file at the provided path
with open(path, newline='', encoding='utf-8') as csvfile:
data = csv.reader(csvfile)
all_courses.extend([row for row in data])
display_courses(all_courses)
或者将display_courses()函数的all_courses参数的默认值设置为all_courses而不是None:
def display_courses(all_courses=all_courses):
...
还建议添加空字符串"选项设置为两个OptionMenu，以便您可以重置过滤器:
...
year_dropdown = tk.OptionMenu(root, year_var, "", "1", "2", "3", "4","5")
...
code_dropdown = tk.OptionMenu(root, code_var, "", "CHI" ,"CS","ECE","ECON","EE", "EECS","ENGR","FRE","IE","ISE","LIFE",
"MATH", "MGT", "UNI")
...