os.path.join(path, *paths)

约定不等于承诺〃 2023-02-15 01:13 12阅读 0赞

# **os.path.join(path, \*paths)** #

**os.path - Common pathname manipulations (常见路径操作)**  
[https://docs.python.org/3.7/library/os.path.html][https_docs.python.org_3.7_library_os.path.html]

## 1. `os.path.join(path, *paths)` ##

Join one or more path components intelligently. The return value is the concatenation of `path` and any members of `*paths` with exactly one directory separator (`os.sep`) following each non-empty part except the last, meaning that the result will only end in a separator if the last part is empty. If a component is an absolute path, all previous components are thrown away and joining continues from the absolute path component.  
合理地拼接一个或多个路径部分。返回值是 `path` 和 `*paths` 所有值的连接，每个非空部分后面都紧跟一个目录分隔符 (`os.sep`)，除了最后一个。这意味着如果最后一部分为空，则结果将以分隔符 `/` 结尾。**如果参数中某个部分是绝对路径，则绝对路径前的路径都将被丢弃，并从绝对路径部分开始连接。**

On Windows, the drive letter is not reset when an absolute path component (e.g., `r'\foo'`) is encountered. If a component contains a drive letter, all previous components are thrown away and the drive letter is reset. Note that since there is a current directory for each drive, `os.path.join("c:", "foo")` represents a path relative to the current directory on drive `C:` (`c:foo`), not `c:\foo`.  
在 Windows 上，遇到绝对路径部分 (e.g., `r'\foo'`) 时，不会重置盘符。如果某部分路径包含盘符，则会丢弃所有先前的部分，并重置盘符。请注意，由于每个驱动器都有一个当前目录，所以 `os.path.join("c:", "foo")` 表示驱动器 `C:` 上当前目录的相对路径 (`c:foo`)，而不是 `c:\foo`。

## 2. example 1 ##

#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # yongqiang cheng
    
    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function
    
    import os
    
    path1 = "yong"
    path2 = "qiang"
    path3 = "cheng"
    
    sum_path = path1 + path2 + path3
    merge_path = os.path.join(path1, path2, path3)
    
    print("sum_path = ", sum_path)
    print("merge_path = ", merge_path)

/home/yongqiang/miniconda3/envs/tf_cpu_1.4.1/bin/python /home/yongqiang/pycharm_work/yongqiang.py
    sum_path =  yongqiangcheng
    merge_path =  yong/qiang/cheng
    
    Process finished with exit code 0

## 3. example 2 ##

#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # yongqiang cheng
    
    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function
    
    import os
    
    path1 = "yong"
    path2 = "/qiang"
    path3 = "cheng"
    
    sum_path = path1 + path2 + path3
    merge_path = os.path.join(path1, path2, path3)
    
    print("sum_path = ", sum_path)
    print("merge_path = ", merge_path)

/home/yongqiang/miniconda3/envs/tf_cpu_1.4.1/bin/python /home/yongqiang/pycharm_work/yongqiang.py
    sum_path =  yong/qiangcheng
    merge_path =  /qiang/cheng
    
    Process finished with exit code 0

## 4. example 3 ##

#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # yongqiang cheng
    
    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function
    
    import os
    
    path1 = "/yong/"
    path2 = "/qiang/"
    path3 = "cheng/"
    
    sum_path = path1 + path2 + path3
    merge_path = os.path.join(path1, path2, path3)
    
    print("sum_path = ", sum_path)
    print("merge_path = ", merge_path)

/home/yongqiang/miniconda3/envs/tf_cpu_1.4.1/bin/python /home/yongqiang/pycharm_work/yongqiang.py
    sum_path =  /yong//qiang/cheng/
    merge_path =  /qiang/cheng/
    
    Process finished with exit code 0

## 5. example 4 ##

#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # yongqiang cheng
    
    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function
    
    import os
    
    path1 = "/yong"
    path2 = "/qiang"
    path3 = "/cheng"
    
    sum_path = path1 + path2 + path3
    merge_path = os.path.join(path1, path2, path3)
    
    print("sum_path = ", sum_path)
    print("merge_path = ", merge_path)

/home/yongqiang/miniconda3/envs/tf_cpu_1.4.1/bin/python /home/yongqiang/pycharm_work/yongqiang.py
    sum_path =  /yong/qiang/cheng
    merge_path =  /cheng
    
    Process finished with exit code 0

[https_docs.python.org_3.7_library_os.path.html]: https://docs.python.org/3.7/library/os.path.html