使用 input 获取文件路径; data.txt 文件的位置为:src/step1/data.csv; data.txt 内容如下: ``` Temperature data Fahrenheit degrees: 67.2
时间: 2025-01-01 10:39:29 浏览: 7
在Python中,如果你想通过`input()`获取用户输入的文件路径,并假设数据是在`src/step1/data.csv`这个特定位置,你可以这样做:
```python
# 获取用户输入的文件路径
file_path = input("请输入文件路径(默认为'src/step1/data.csv'): ") or 'src/step1/data.csv'
# 检查路径是否存在并尝试打开文件
if not os.path.isfile(file_path):
print(f"文件 {file_path} 不存在.")
else:
with open(file_path, 'r') as file:
# 读取文件内容
content = file.read()
print(content.strip()) # 输出内容,去除首尾空白
# 数据示例
data_example = "Temperature data Fahrenheit degrees: 67.2"
print(data_example)
```
在这个例子中,我们首先提示用户输入文件路径,如果他们没有提供,就使用默认值。然后检查路径是否真的存在,如果存在,我们就打开文件并读取其内容。
相关问题
ERROR streaming.StreamJob: Error Launching job : Output directory hdfs://192.168.189.131:9000/data/sk20/sk200245/out already exists Streaming Command Failed!
这个错误通常是因为输出路径已经存在而导致的。在Hadoop中,输出路径必须是一个不存在的目录,否则Hadoop将不允许将输出写入该目录。因此,您需要删除现有的输出目录或更改输出路径来解决此问题。
您可以通过以下步骤来解决此问题:
1. 使用Hadoop fs命令删除现有的输出目录,例如:
```
hadoop fs -rm -r hdfs://192.168.189.131:9000/data/sk20/sk200245/out
```
2. 更改输出路径,例如:
```
hadoop jar hadoop-streaming.jar -input input_dir -output output_dir_new -mapper mapper.py -reducer reducer.py -file mapper.py -file reducer.py
```
注意:请确保输出路径是一个不存在的目录。
Input path does not exist: file:/export/software/data.txt
As an AI language model, I cannot access files or paths on your system. However, the error message "Input path does not exist: file:/export/software/data.txt" indicates that the specified file path does not exist or is inaccessible. Possible reasons for this error include:
1. The file or directory does not exist at the specified path.
2. The file or directory is inaccessible due to insufficient permissions.
3. The file or directory has been moved or deleted.
To resolve this error, you should check the specified file path and ensure that it exists and is accessible. You can also check the file permissions to ensure that you have the necessary access rights to read the file. If the file has been moved or deleted, you may need to locate a backup copy or recreate the file.
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