def从不同的脚本访问文件

时间:2015-10-19 07:26:34

标签: python

首先是目录。

file1.py
|
| --__init__.py 
    file2.py
    some_package
    |
    | --__init__.py
        config.py
        settings.ini
    other_package
    |
    | --__init__.py 
        access.py 

现在,在config.py中,有一个函数readfromsetting(),它读取settings.ini并返回其中的内容。在access.py中,我导入了config.py(不,这不是您的想法,access.py成功导入config.py),并尝试调用readfromsetting()函数,但是Python会抛出错误。

No such file or directory, "settings.ini"

所以,我的问题是,如何使用settings.iniaccess.py阅读config.py的内容?

我的config.py

def readfromsetting():
    with open('settings.py', 'r') as file:
        return file.read()

我的access.py

from some_package import config

def get_setting():
    return config.readfromsetting()

2 个答案:

答案 0 :(得分:2)

执行package org.apache.hadoop.examples; import java.io.IOException; import java.util.StringTokenizer; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.util.GenericOptionsParser; public class WordCount2 { public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable>{ private final static IntWritable one = new IntWritable(1); private Text word = new Text(); public void map(Object key, Text value, Context context ) throws IOException, InterruptedException { StringTokenizer itr = new StringTokenizer(value.toString()," \t\n\r\f,.:;?![]'"); while (itr.hasMoreTokens()) { word.set(itr.nextToken().toLowerCase()); context.write(word, one); } } } public static class IntSumReducer extends Reducer<Text,IntWritable,Text,IntWritable> { private IntWritable result = new IntWritable(); public void reduce(Text key, Iterable<IntWritable> values, Context context ) throws IOException, InterruptedException { int sum = 0; for (IntWritable val : values) { sum += val.get(); } result.set(sum); if (sum > 4) context.write(key, result); } } public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); if (otherArgs.length < 2) { System.err.println("Usage: wordcount <in> [<in>...] <out>"); System.exit(2); } Job job = Job.getInstance(conf, "word count"); job.setJarByClass(WordCount2.class); job.setMapperClass(TokenizerMapper.class); job.setCombinerClass(IntSumReducer.class); job.setReducerClass(IntSumReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); for (int i = 0; i < otherArgs.length - 1; ++i) { FileInputFormat.addInputPath(job, new Path(otherArgs[i])); } FileOutputFormat.setOutputPath(job, new Path(otherArgs[otherArgs.length - 1])); System.exit(job.waitForCompletion(true) ? 0 : 1); } } 时,python查看import <some script>的内容以导入python脚本。但是当您使用sys.path或其他方法读取文件并且提供相对路径时,Python会尝试将路径解析为相对于当前工作目录的路径,它不会查看脚本所在的目录(除非那是工作目录。)

您不应该依赖相对路径,而应尽可能尝试给出绝对路径。

在您的情况下,如果您确定目录结构不会更改(open()将始终位于settings.ini存在或config.py存在的目录中),那么您可以使用settings.py变量来访问文件的路径,然后使用它来创建__file__的绝对路径。示例 -

settings.ini

答案 1 :(得分:0)

你的问题在这里:

def readfromsetting():
  with open('settings.ini', 'r') as file:
    return file.read()

&#39;的Settings.ini&#39;是一条相对的道路。如果您要查找的文件位于同一目录中,则此方法非常有用。由于您从access.py调用此方法,而access.py不在此目录中,因此无法找到settings.ini文件。

我建议您在open方法中使用settings.ini文件的绝对路径。如果您确定只在access.py中调用此方法,则还可以编辑其他答案中提到的__file__