python如何获取上传图片后缀名

1.
获取文件后缀名：
复制代码代码如下:
#!/usr/bin/python
import
os
dict
=
{}
for
d,
fd,
fl
in
os.walk('/home/ahda/Program/'):
for
f
in
fl:
sufix
=
os.path.splitext(f)[1][1:]
if
dict.has_key(sufix):
dict[sufix]
+=
1
else:
dict[sufix]
=
1
for
item
in
dict.items():
print
"%s
:
%s"
%
item
这里的关键是os.path.splitext()
如abc/ef.g.h
，这里获取到的是h
2.
python查找遍历指定文件路径下指定后缀名的文件实例：
复制代码代码如下:
import
os
import
sys
import
os.path
for
dirpath,
dirnames,
filenames
in
os.walk(startdir):
for
filename
in
filenames:
if
os.path.splitext(filename)[1]
==
'.txt':
filepath
=
os.path.join(dirpath,
filename)
#print("file:"
+
filepath)
input_file
=
open(filepath)
text
=
input_file.read()
input_file.close()
output_file
=
open(
filepath,
'w')
output_file.write(text)
output_file.close()
3.
批量重命名目录中的文件后缀实例：
复制代码代码如下:
import
os
def
swap_extensions(dir,
before,
after):
if
before[:1]
!=
'.':
#如果参数中的后缀名没有'.'则加上
before
=
'.'
+
before
thelen
=
-len(before)
if
after[:1]
!=
'.':
after
=
'.'
+
after
for
path,
subdir,
files
in
os.walk(dir):
for
oldfile
in
files:
if
oldfile[thelen:]
==
before:
oldfile
=
os.path.join(path,
oldfile)
newfile
=
oldfile[:thelen]
+
after
os.rename(oldfile,
newfile)
print
oldfile
+'
changed
to
'
+
newfile
if
__name__
==
'__main__':
import
sys
if
len(sys.argv)
!=
4:
print
'Usage:swap_extension.py
rootdir
before
after'
sys.exit(1)
swap_extensions(sys.argv[1],
sys.argv[2],
sys.argv[3])
例子:将e:/py/test目录下.php结尾的文件重命名为.py
E:py>python_cook
e:/py/test
.php
.py
e:/py/testtest.php
changed
to
e:/py/testtest.py
e:/py/test1.php
changed
to
e:/py/test1.py
e:/py/test2.php
changed
to
e:/py/test2.py