只接受一种文件类型

Question

from tkinter import filedialog as fd

filename = fd.askopenfilename(title = "Select file",filetypes = (("CSV Files","*.csv"),("All","*.*")))

打开文件夹选择文件，但是当我尝试时：

from tkinter import filedialog as fd

filename = fd.askopenfilename(title = "Select file",filetypes = ("CSV Files","*.csv"))

错误：

Traceback（最近一次调用最后一次）：文件 “D:\python_projects\csv_codes\csv_reading.py”，第 4 行，在 文件名 = fd.askopenfilename(title = "选择文件",filetypes = ("CSV Files" ,"*.csv")) 文件 "C:\Python\lib\tkinter\filedialog.py", 第 375 行，在 askopenfilename 中 返回 Open(**options).show() 文件“C:\Python\lib\tkinter\commondialog.py”，第 43 行，在 show s = w.tk.call(self.command, w._options(self.options)) _tkinter.TclError: bad file type ".csv", 应该是 "typeName {extension ?extension ions ...?} ?{macType ?macTypes ...?}?"

我到底想要什么？：

我只想选择 .CSV 文件。 （强制）

Answer 1

filetypes 必须是元组的元组。例如：

from tkinter import filedialog as fd

filename = fd.askopenfilename(title = "Select file",filetypes = (("CSV Files","*.csv"),))

但我建议您将所有内容都整齐地放在一个窗口中。例如，与您的输入相同但更整洁：

from tkinter import *
from tkinter import filedialog as fd

def get_file_name(file_entry):
    file_name = fd.askopenfilename(title = "Select file",filetypes = (("CSV Files","*.csv"),))
    file_entry.delete(0,END)
    file_entry.insert(0,file_name)

def run_and_close(event=None):
    ######################################
    ## EXECUTE OR CALL OTHER PYTHON FILE##
    ######################################
    close()

def close(event=None):
    master.withdraw() # if you want to bring it back
    sys.exit() # if you want to exit the entire thing

master = Tk()
master.title("This is my Interface")

entry_csv=Entry(master, text="", width=50)
entry_csv.grid(row=0, column=1, sticky=W, padx=5)

Label(master, text="Input CSV").grid(row=0, column=0 ,sticky=W)
Button(master, text="Browse...", width=10, command=lambda:get_file_name(entry_csv)).grid(row=0, column=2, sticky=W)

Button(master, text="Ok",     command=run_and_close, width=10).grid(row=3, column=1, sticky=E, padx=5)
Button(master, text="Cancel", command=close, width=10).grid(row=3, column=2, sticky=W)

master.bind('<Return>', run_and_close)
master.bind('<Escape>', close)
mainloop()