python - NameError 使用 "finally: f.close()"和 "with open(..) as f"

Question

我在 python 中有如下代码。我正在使用“with”关键字打开一个文件并解析它的内容。但是当我试图关闭文件时发生错误。请帮助。

错误信息:“NameError:name 'f' is not defined”

try:
    user_xml_name = raw_input('Enter the xml name: ')
    xml_name = user_xml_name.replace(" ", "")

    with open(xml_name) as f:
        with open("temp_" + xml_name, "w") as f1:
            for line in f:
                f1.write(line)

except IOError:
    print print "File" + " " + user_xml_name + " " + "doesn't exist"

finally :
    f.close()
    f1.close()

Answer 1

您不需要手动关闭它。 with 语句会处理它。

因此，删除 finally 子句:

try:
    user_xml_name = raw_input('Enter the xml name: ')
    xml_name = user_xml_name.replace(" ", "")

    with open(xml_name) as f:
        with open("temp_" + xml_name, "w") as f1:
            for line in f:
                f1.write(line)
except IOError:
    print "File %s doesn't exist",user_xml_name