Python用file对象和open方法处理文件的区别

Python用file对象和open方法处理文件的区别

python document 是这么说的：

File objects are implemented using C’s stdio package and can be created
with the built-in open() function. File objects are also returned by
some other built-in functions and methods, such as os.popen() and
os.fdopen() and the makefile()
method of socket objects. Temporary files can be created using the
tempfile module, and high-level file operations such as copying, moving,
and deleting files and directories can be achieved with the shutil
module.

并且对File 对象的构造函数说明如下：

file(filename[, mode[, bufsize]])

Constructor function for the file type, described further in section
File Objects. The constructor’s arguments are the same as those of the
open() built-in function described below.

When opening a file, it’s preferable to use open() instead of invoking
this constructor directly. file is more suited to type testing (for
example, writing isinstance(f, file)).

New in version 2.2.

但是其实我在如下代码段中，def setNodeManagerDomain(domainDir):

try:

domainName = os.path.basename(domainDir)

fd = open(domainDir + '/nodemanager/nodemanager.domains', 'w')

fd.write('#Domains and directories created by Configuration Wizard.\n')

fd.write('#' + time.ctime() + '\n')

dirNorm=os.path.normpath(domainDir).replace('\\','\\\\')

fd.write(domainName + '=' + dirNorm)

print 'create domain file and close in the end under the directory:' + domainDir

fd.close

except Exception, e:

print 'Failed to create domain file in the directory:' + domainDir

我使用file对象 or open方法在windows 环境下都能通过，但是程序部署到Linux环境中就出现问题。

[echo] NameError: file

可能linux环境对file支持不好，所以保险起见，还是遵循文档中所说的，坚持用open方法吧。

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