仅接受一种文件类型

from tkinter import filedialog as fd

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

打开文件夹以选择文件，但是当我尝试时：

from tkinter import filedialog as fd

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

Error:

回溯（最近一次调用最后一次）：文件 “D:\python_projects\csv_codes\csv_reading.py”，第 4 行，在 filename = fd.askopenfilename(title = "选择文件",filetypes = ("CSV 文件","*.csv")) 文件 "C:\Python\lib\tkinter\filedialog.py", 第375行，在askopenfilename中 return Open(**options).show() 文件“C:\Python\lib\tkinter\commondialog.py”，第 43 行，显示 s = w.tk.call(self.command,w._options(self.options)) _tkinter.TclError：错误的文件类型“.csv”，应该是“typeName {扩展名？扩展名...？}？{macType ？macTypes ...？}？”

我到底想要什么？：

我想要的只是.CSV要选择的文件。 （强制性的）

filetypes需要是元组的元组。例如：

from tkinter import filedialog as fd

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

但我建议您将这一切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()