File Management in Python - Creating In-memory Files (
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A number of modules you will encounter contain methods that require a file object as an argument. Sometimes, it is inconvenient to create and use a real file, however. Thankfully, you can create files that store themselves in a computer's memory using the "StringIO" module:
import StringIO
fileHandle = StringIO.StringIO ( "Let freedom ring." )
print fileHandle.read() # "Let freedom ring."
fileHandle.close()
A "cStringIO" module is also availible. It is identical to the "StringIO" module in use, but, just like the "cPickle" module is to the "pickle" module, it is faster:
import cStringIO
fileHandle = cStringIO.cStringIO ( "To Kill a Mockingbird" )
print fileHandle.read() # "To Kill a Mockingbid"
fileHandle.close()
Conclusion
File management is a task that programmers of many languages will often encounter in their applications. Thankfully, Python makes the task incredibly easy compared to other languages. It offers many modules in its standard library that aid programmers, and its object orientation further simplifies things.
You now have a basic understanding of file management in Python, and you will use it in many future applications.
| | Discuss File Management in Python | | | | | | | Hello!
I wrote this article with a "less talk and more code" approach. Does... | | | | | | Good article, I like the code-heavy approach. Another module I find useful is... | | | | | | I like the more-code approach. A nice article.
When you're starting out, it's... | | | | | | fileHandle = open ( 'usernames.txt','ab' )
fileHandle.write (raw_input("Please... | | | | | | fileHandle.write ( raw_input ( 'Please enter user name to add: ' ) + '\n' )... | | | | | | Hey.
I am a python newbie, and reading the "File Management" article helped me... | | | | | | following the nice file i/o tutorial here, i have only one remaining quesiton:
how... | | | | | | The article may be good, but it does not explain how to avoid program exit when file... | | | | | | Be consistent with your backslashes, this will solve your problem! | | | | | | thats a more general issue of exception handling, IMHO | | | | | | I get errors when I try to run the first example in - Getting Information on... | | | | | | thanks man! that worked great. (CentOS) | | | | | | for some reason the fileHandle.read() command doesn't work. when i put nothing in... | | | | | | the 'fileHandle' part of fileHandle.read() is the part that specifies the file. dont... | | | | | | hi,
what about:
if os.access(myfile, os.W_OK) ? | | | | | | >>> Post your comment now! | | | | | |
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