Python - 被类和实例变量混淆

Question

我尝试为 unix 查找命令编写一个小包装脚本。我搞砸了参数传递。你能给我一个关于我的错误的提示吗？

错误信息是

Traceback (most recent call last):
  File "frep.py", line 43, in <module>
    inst.prep_shell_commands(self.extension, self.search_string, self.rel_numbers)
NameError: name 'self' is not defined

这是代码:

import os
import subprocess
import string
import sys


class Frep(object):

    extension = ""
    search_string =""
    commands = []
    rel_numbers = ""


    def get_params(self):
        Frep.no_of_params = len(sys.argv)
        if Frep.no_of_params == 4:
            Frep.extension = str(sys.argv[1])
            Frep.search_string = str(sys.argv[2])
            Frep.rel_numbers = str(sys.argv[3])
        else:
            print "Usage:   frep [FILE_EXTENSION] [SEARCH_STRING] [RELEASE_NUMBERS]"
            print "Example: frep sql my_search_string [5-6]"
            print " "
            sys.exit()


    def prep_shell_commands(self, ext, ss, reln):
        print ext
        tmp_folderlist = string.split(subprocess.check_output("find /data/grep_dir -maxdepth 1 -type d -name '["+reln+"]*'", shell=True), '\n')
        #tmp_folderlist = string.split(subprocess.check_output("find /data/grep_dir -maxdepth 1 -type d -name '[6-7]*'", shell=True), '\n')
        for d in tmp_folderlist:
            commands.append("find " + d + " -type f -name '*" + ext +"' -exec grep -il '" + ss +"' {} \;")
        print commands


    def exec_commands(self, c_list):
        for c in c_list:
            os.system(c)


inst = Frep()

inst.prep_shell_commands(self.extension, self.search_string, self.rel_numbers)

exec_commands(self.commands)

Answer 1

您通过使用对象实例的名称来调用实例成员

inst.prep_shell_commands(inst.extension, inst.search_string, isnt.rel_numbers)

也就是说，如果您的方法总是要调用实例变量，那么您应该重写您的 prep_shell_commands 方法，使其不接受任何参数。