如果我不指定目录，Python Tkinter 应该使用默认目录

Question

我有以下程序： https://i.sstatic.net/tgzxz.png 。现在，如果我按“下载位置”按钮，则应将歌曲下载到所选目录中，这可以很好地工作。但是，如果我不按按钮，则应使用我选择的目录，“默认目录”，然后将文件移至此“默认目录” 移动文件的“选择下载位置按钮”代码的

def select_download_location():
global destination_source_new
destination_source_new = 
filedialog.askdirectory(initialdir=os.path.normpath(r'C:\Users\kevin\Music'))

代码下载位置：

filename_url = "y2meta.com"
format = ".mp3"
space = filename_url + " "
hyphen ="- "
quality_file_320 = " (320 kbps)"
backslash = "\\"
filename = '\\'+ space + hyphen +title+ quality_file_320 +format
# Location where the file is downloaded to
download_source = r'C:\Users\kevin\Downloads'
source = download_source + filename
# Location where the file should be moved to
destination = destination_source_new
# Move the file from the download folder to the destination folder
dest = shutil.move(source,destination)

Answer 1

您可以按如下方式指定目的地，如果目的地没有更改，它将采用默认目的地。

destination_source_new = ''
filename_url = "y2meta.com"
format = ".mp3"
space = filename_url + " "
hyphen = "- "
quality_file_320 = " (320 kbps)"
backslash = "\\"
filename = '\\' + space + hyphen + title + quality_file_320 + format
# Location where the file is downloaded to
download_source = r'C:\Users\kevin\Downloads'
source = download_source + filename
# Location where the file should be moved to
target  = r'C:\Users\kevin\Music'
destination = destination_source_new if destination_source_new  != '' else target
# Move the file from the download folder to the destination folder
print(source)
print(destination)
dest = shutil.move(source, destination)

输出：

source= C:\Users\kevin\Downloads\y2meta.com - title (320 kbps).mp3
destination= C:\Users\kevin\Music