Python GUI 无法看到全局变量

Question

我正在运行一个函数。一旦运行，我希望能够重新使用 target_dir变量驻留在函数的模块中(由另一个函数使用)，所以我将该变量设置为 global .

但是，当我在 Python GUI 中输入该变量的名称时:target_dir我收到这条消息:

NameError: name 'target_dir' is not defined

这是模块:

def SECdownload(year, month):
    import os
    from urllib.request import urlopen
    root = None
    feedFile = None
    feedData = None
    good_read = False
    itemIndex = 0
    edgarFilingsFeed = 'http://www.sec.gov/Archives/edgar/monthly/xbrlrss-' + str(year) + '-' + str(month).zfill(2) + '.xml'
    print(edgarFilingsFeed)
    #print( edgarFilingsFeed ) #from the slides
    if not os.path.exists( "sec/" + str(year) ):
        os.makedirs( "sec/" + str(year) )
    if not os.path.exists( "sec/" + str(year) + '/' + str(month).zfill(2) ):
        os.makedirs( "sec/" + str(year) + '/' + str(month).zfill(2) )
    global target_dir
    target_dir = "sec/" + str(year) + '/' + str(month).zfill(2) + '/'
    try:
        feedFile = urlopen( edgarFilingsFeed ) # urlopen will not work (python 3) needs from urllib.request import urlopen
        try:
            feedData = feedFile.read()
            good_read = True
        finally:
            feedFile.close()
    except HTTPError as e:
        print( "HTTP Error:", e.code )

附注我也尝试过这种识别:

 if not os.path.exists( "sec/" + str(year) + '/' + str(month).zfill(2) ):
        os.makedirs( "sec/" + str(year) + '/' + str(month).zfill(2) )
global target_dir
    target_dir = "sec/" + str(year) + '/' + str(month).zfill(2) + '/'

关于如何创建变量 target_dir 的任何想法我运行 SECdownload 后可用功能？

Answer 1

你可以返回。只需在函数末尾添加即可

def SECdownload(year, month):
    import os
    from urllib.request import urlopen
    root = None
    feedFile = None
    feedData = None
    good_read = False
    itemIndex = 0
    edgarFilingsFeed = 'http://www.sec.gov/Archives/edgar/monthly/xbrlrss-' + str(year) + '-' + str(month).zfill(2) + '.xml'
    print(edgarFilingsFeed)
    #print( edgarFilingsFeed ) #from the slides
    if not os.path.exists( "sec/" + str(year) ):
        os.makedirs( "sec/" + str(year) )
    if not os.path.exists( "sec/" + str(year) + '/' + str(month).zfill(2) ):
        os.makedirs( "sec/" + str(year) + '/' + str(month).zfill(2) )
    target_dir = "sec/" + str(year) + '/' + str(month).zfill(2) + '/'
    try:
        feedFile = urlopen( edgarFilingsFeed ) # urlopen will not work (python 3) needs from urllib.request import urlopen
        try:
            feedData = feedFile.read()
            good_read = True
        finally:
            feedFile.close()
    except HTTPError as e:
        print( "HTTP Error:", e.code )
    return target_dir

然后，当您可以时，它将返回 target_dir。

target_dir = SECdownload(someYear, someMonth)

如果你想使用全局变量，你需要先初始化你的变量。

target_dir = None
def SECdownload(year, month):
    import os
    from urllib.request import urlopen
    root = None
    feedFile = None
    feedData = None
    good_read = False
    itemIndex = 0
    edgarFilingsFeed = 'http://www.sec.gov/Archives/edgar/monthly/xbrlrss-' + str(year) + '-' + str(month).zfill(2) + '.xml'
    print(edgarFilingsFeed)
    #print( edgarFilingsFeed ) #from the slides
    if not os.path.exists( "sec/" + str(year) ):
        os.makedirs( "sec/" + str(year) )
    if not os.path.exists( "sec/" + str(year) + '/' + str(month).zfill(2) ):
        os.makedirs( "sec/" + str(year) + '/' + str(month).zfill(2) )
    global target_dir
    target_dir = "sec/" + str(year) + '/' + str(month).zfill(2) + '/'
    try:
        feedFile = urlopen( edgarFilingsFeed ) # urlopen will not work (python 3) needs from urllib.request import urlopen
        try:
            feedData = feedFile.read()
            good_read = True
        finally:
            feedFile.close()
    except HTTPError as e:
        print( "HTTP Error:", e.code )

您可以像这样导入它。

import test #name of your file

test.SECdownload(2014, 5)
print(test.target_dir)