本文整理汇总了Python中Path.Path.exists方法的典型用法代码示例。如果您正苦于以下问题：Python Path.exists方法的具体用法？Python Path.exists怎么用？Python Path.exists使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Path.Path的用法示例。
在下文中一共展示了Path.exists方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: CMakeCache
# 需要导入模块: from Path import Path [as 别名]
# 或者: from Path.Path import exists [as 别名]
class CMakeCache( object ):
"""This class is used to read in and get programmatic access to the
variables in a CMakeCache.txt file, manipulate them, and then write the
cache back out."""
def __init__( self, path=None ):
self._cachefile = Path( path )
_cachefile = str( self._cachefile )
self._entries = {}
if self._cachefile.exists():
with open( _cachefile ) as c:
entries = filter( None, map( lambda x: CacheEntry( x ),
c.readlines() ) )
entries = filter( lambda x: x.value() != None, entries )
for i in entries:
self._entries[i.name()] = i
def __contains__( self, thingy ):
try:
return thingy in self.names()
except TypeError:
return thingy in self._entries.values()
def __iter__( self ):
return self._entries
def __nonzero__( self ):
return len( self._entries ) > 0
def __str__( self ):
return os.linesep.join( map( lambda x: str( x ), self.entries() ) )
def add( self, entry ):
e = CacheEntry( entry )
if e:
if not e in self:
self._entries[e.name()] = e
else:
sys.stderr.write( "Entry for '%s' is already in the cache.\n" % \
e.name() )
else:
sys.stderr.write( "Could not create cache entry for '%s'\n" % e )
def update( self, entry ):
e = CacheEntry( entry )
if e:
self._entries[e.name()] = e
else:
sys.stderr.write( "Could not create cache entry for '%s'\n" % e )
def names( self ):
return self._entries.keys()
def entries( self ):
return self._entries.values()
def get( self, name ):
return self._entries[name]
def cachefile( self ):
return self._cachefile
def refresh( self ):
self.__init__( self._cachefile )
def write( self, newfile = None ):
if newfile == None:
newfile = self._cachefile
with open( newfile, 'w' ) as f:
for e in self.entries():
f.write( str( e ) + os.linesep )