https://docs.python.org/3/library/os.path.html

在python 3中，pathlib“pathlib模块提供高级路径对象。”所以

>>> from pathlib import Path

>>> p = Path("/a/b/c.txt")
>>> p.with_suffix('')
WindowsPath('/a/b/c')
>>> p.stem
'c'

其他方法不会删除多个扩展。有些文件名没有扩展名也有问题。这段代码处理这两个实例，在Python2和Python3中都可以使用。它从路径中获取基名称，将值拆分为点，并返回第一个值，即文件名的初始部分。

import os

def get_filename_without_extension(file_path):
    file_basename = os.path.basename(file_path)
    filename_without_extension = file_basename.split('.')[0]
    return filename_without_extension

下面是一组要运行的示例：

example_paths = [
    "FileName", 
    "./FileName",
    "../../FileName",
    "FileName.txt", 
    "./FileName.txt.zip.asc",
    "/path/to/some/FileName",
    "/path/to/some/FileName.txt",
    "/path/to/some/FileName.txt.zip.asc"
]

for example_path in example_paths:
    print(get_filename_without_extension(example_path))

在任何情况下，打印的值为：

FileName

使用Pathlib回答几个场景

使用Pathlib，当只有一个扩展名（或没有扩展名）时，获取文件名很简单，但处理多个扩展名的一般情况可能会很困难。

零或一扩展

from pathlib import Path

pth = Path('./thefile.tar')

fn = pth.stem

print(fn)      # thefile


# Explanation:
# the `stem` attribute returns only the base filename, stripping
# any leading path if present, and strips the extension after
# the last `.`, if present.


# Further tests

eg_paths = ['thefile',
            'thefile.tar',
            './thefile',
            './thefile.tar',
            '../../thefile.tar',
            '.././thefile.tar',
            'rel/pa.th/to/thefile',
            '/abs/path/to/thefile.tar']

for p in eg_paths:
    print(Path(p).stem)  # prints thefile every time

两个或更少的扩展

from pathlib import Path

pth = Path('./thefile.tar.gz')

fn = pth.with_suffix('').stem

print(fn)      # thefile


# Explanation:
# Using the `.with_suffix('')` trick returns a Path object after
# stripping one extension, and then we can simply use `.stem`.


# Further tests

eg_paths += ['./thefile.tar.gz',
             '/abs/pa.th/to/thefile.tar.gz']

for p in eg_paths:
    print(Path(p).with_suffix('').stem)  # prints thefile every time

任意数量的扩展名（0、1或更多）

from pathlib import Path

pth = Path('./thefile.tar.gz.bz.7zip')

fn = pth.name
if len(pth.suffixes) > 0:
    s = pth.suffixes[0]
    fn = fn.rsplit(s)[0]

# or, equivalently

fn = pth.name
for s in pth.suffixes:
    fn = fn.rsplit(s)[0]
    break

# or simply run the full loop

fn = pth.name
for _ in pth.suffixes:
    fn = fn.rsplit('.')[0]

# In any case:

print(fn)     # thefile


# Explanation
#
# pth.name     -> 'thefile.tar.gz.bz.7zip'
# pth.suffixes -> ['.tar', '.gz', '.bz', '.7zip']
#
# If there may be more than two extensions, we can test for
# that case with an if statement, or simply attempt the loop
# and break after rsplitting on the first extension instance.
# Alternatively, we may even run the full loop and strip one 
# extension with every pass.


# Further tests

eg_paths += ['./thefile.tar.gz.bz.7zip',
             '/abs/pa.th/to/thefile.tar.gz.bz.7zip']

for p in eg_paths:
    pth = Path(p)
    fn = pth.name
    for s in pth.suffixes:
        fn = fn.rsplit(s)[0]
        break

    print(fn)  # prints thefile every time

已知第一个扩展的特殊情况

例如，如果扩展名可以是.tar、.tar.gz、.tar/gz.bz等；您可以简单地rsplit已知的扩展并获取第一个元素：

pth = Path('foo/bar/baz.baz/thefile.tar.gz')

fn = pth.name.rsplit('.tar')[0]

print(fn)      # thefile

为了方便起见，一个简单的函数包装了os.path中的两个方法：

def filename(path):
  """Return file name without extension from path.

  See https://docs.python.org/3/library/os.path.html
  """
  import os.path
  b = os.path.split(path)[1]  # path, *filename*
  f = os.path.splitext(b)[0]  # *file*, ext
  #print(path, b, f)
  return f

用Python 3.5测试。

获取不带扩展名的文件名：

import os
print(os.path.splitext("/path/to/some/file.txt")[0])

打印：

/path/to/some/file

os.path.splitext文档。

重要提示：如果文件名有多个点，则只删除最后一个点之后的扩展名。例如：

import os
print(os.path.splitext("/path/to/some/file.txt.zip.asc")[0])

打印：

/path/to/some/file.txt.zip

如果您需要处理该案例，请参阅下面的其他答案。

import os
path = "a/b/c/abc.txt"
print os.path.splitext(os.path.basename(path))[0]