python - 为什么Python不使用工作目录以及如何对其进行修复？

我有个问题，需要很长时间来解释，所以我要把它分解成有趣的部分。我试着用kconfiglib.py解析一些kconfig。这是我的代码（ofconfig.in）

[intro_code]
source "b.in"

我的代码正在做它应该在[简介代码]。我不确定source是否是python关键字，但它是关于输入/包含不同的文件（这里的名称是b.in，与执行的脚本位于同一文件夹中）
错误消息：现在运行脚本时，将显示以下错误消息：

IOError: config.in:51: sourced file "b.in" (expands to
"b.in") not found. Perhaps base_dir
(argument to Config.__init__(), currently
"$srctree") is set to the wrong value.

我要解决的问题是：我试图将工作目录更改为Sourcecodes（这是config.in和b.in所在的位置）在config.in之上：

os.chdir("/home/fedor/Sourcecodes")
retval = os.getcwd()
print "Directory changed successfully %s" % retval

在执行过程中，它返回：
目录更改成功/home/fedor/Sourcecodes
所以目录看起来没问题，但无论如何都会出现相同的错误消息。
它在以下情况下工作：使用绝对路径b.in（比如source "/home/fedor/Sourcecodes/b.in")，然后它就工作了，但这不是我可以使用脚本的方式。
有人知道如何告诉python在与执行的脚本相同的目录中查找吗？
[编辑：]如所愿，完整代码：
我打电话给python /home/fedor/Sourcecodes/Kconfiglib/examples/print_tree.py /home/fedor/Sourcecodes/config.in
kconfiglib中的print_tree.py示例：

# Prints a tree of all items in the configuration

import kconfiglib
import sys
import os

os.chdir("/home/fedor/BR1311")


retval = os.getcwd()

print "Directory changed successfully %s" % retval

def print_with_indent(s, indent):
    print (" " * indent) + s

def print_items(items, indent):
    for item in items:
        if item.is_symbol():
            print_with_indent("config {0}".format(item.get_name()), indent)
        elif item.is_menu():
            print_with_indent('menu "{0}"'.format(item.get_title()), indent)
            print_items(item.get_items(), indent + 2)
        elif item.is_choice():
            print_with_indent('choice', indent)
            print_items(item.get_items(), indent + 2)
        elif item.is_comment():
            print_with_indent('comment "{0}"'.format(item.get_text()), indent)

conf = kconfiglib.Config(sys.argv[1])
print_items(conf.get_top_level_items(), 0)

config.in

menu "Audio and video applications"
config BR2_PACKAGE_WIPE
    bool "wipe"
    help
      Wipe is a little command for securely erasing files
      from magnetic media. It compiles under various unix platforms.

      http://wipe.sourceforge.net

config BR2_PACKAGE_BONNIE
    bool "bonnie++"
    depends on BR2_INSTALL_LIBSTDCPP
    depends on BR2_USE_MMU # fork()
    help
      Filesystem tester

      http://www.coker.com.au/bonnie++/

comment "bonnie++ needs a toolchain w/ C++"
    depends on BR2_USE_MMU
    depends on !BR2_INSTALL_LIBSTDCPP
endmenu

source "b.in"

以及b.in（与config.in完全相同，但最后缺少source命令）：

menu "Audio and video applications"
config BR2_PACKAGE_WIPE
    bool "wipe"
    help
      Wipe is a little command for securely erasing files
      from magnetic media. It compiles under various unix platforms.

      http://wipe.sourceforge.net

config BR2_PACKAGE_BONNIE
    bool "bonnie++"
    depends on BR2_INSTALL_LIBSTDCPP
    depends on BR2_USE_MMU # fork()
    help
      Filesystem tester

      http://www.coker.com.au/bonnie++/

comment "bonnie++ needs a toolchain w/ C++"
    depends on BR2_USE_MMU
    depends on !BR2_INSTALL_LIBSTDCPP
endmenu

最佳答案

在您发布的错误消息中，答案是正确的：

Perhaps base_dir (argument to Config.__init__(), currently "$srctree")
is set to the wrong value.

查看github上的source，__init__类的Config接受多个参数，都是默认值。

def __init__(self,
             filename = "Kconfig",
             base_dir = "$srctree",
             print_warnings = True,
             print_undef_assign = False):

…在类的docstring中，解释了base_dir参数：

base_dir (default: "$srctree") -- The base directory relative to which
'source' statements within Kconfig files will work. For the
Linux kernel this should be the top-level directory of the
kernel tree. $-references to environment variables will be
expanded.

The environment variable 'srctree' is set by the Linux makefiles
to the top-level kernel directory. A default of "." would not
work if an alternative build directory is used.

我怀疑如果你把'/home/fedor/BR1311'传递给这个__init__而不是改变它，比如：

conf = kconfiglib.Config(sys.argv[1], '/home/fedor/BR1311')

事情会好得多。

关于python - 为什么Python不使用工作目录以及如何对其进行修复？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/23758052/