import sys
import subprocess
import shlex
import json # json is an easy way to send arbitrary ascii-safe lists of strings out of python
def shell_split(cmd):
"""
Like `shlex.split`, but uses the Windows splitting syntax when run on Windows.
On windows, this is the inverse of subprocess.list2cmdline
"""
if os.name == 'posix':
return shlex.split(cmd)
else:
# TODO: write a version of this that doesn't invoke a subprocess
if not cmd:
return []
full_cmd = '{} {}'.format(
subprocess.list2cmdline([
sys.executable, '-c',
'import sys, json; print(json.dumps(sys.argv[1:]))'
]), cmd
)
ret = subprocess.check_output(full_cmd).decode()
return json.loads(ret)
举一个它们有何不同的例子：
# windows does not treat all backslashes as escapes
>>> shell_split(r'C:\Users\me\some_file.txt "file with spaces"', 'file with spaces')
['C:\\Users\\me\\some_file.txt', 'file with spaces']
# posix does
>>> shlex.split(r'C:\Users\me\some_file.txt "file with spaces"')
['C:Usersmesome_file.txt', 'file with spaces']
# non-posix does not mean Windows - this produces extra quotes
>>> shlex.split(r'C:\Users\me\some_file.txt "file with spaces"', posix=False)
['C:\\Users\\me\\some_file.txt', '"file with spaces"']
import re
def split_arg_string(string):
"""Given an argument string this attempts to split it into small parts."""
rv = []
for match in re.finditer(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
r'|"([^"\\]*(?:\\.[^"\\]*)*)"'
r'|\S+)\s*', string, re.S):
arg = match.group().strip()
if arg[:1] == arg[-1:] and arg[:1] in '"\'':
arg = arg[1:-1].encode('ascii', 'backslashreplace') \
.decode('unicode-escape')
try:
arg = type(string)(arg)
except UnicodeError:
pass
rv.append(arg)
return rv
例如：
>>> print split_arg_string('"this is a test" 1 2 "1 \\" 2"')
['this is a test', '1', '2', '1 " 2']
