Python: Manipulate string or binary bytes with StringIO

November 25th, 2008 mysurface Posted in Developer, python | Hits: 211820 | 7 Comments »

Sometimes it is not convenient to construct string using equal (=) like this:

str = "Hello, "
...
str = str + "my name is "
...
str = str + Name
print str

In python, we have string stream (StringIO) that will behave like file stream, you can construct your string like this:

str=StringIO()
...
str.write("Hello, ")
...
str.write("my name is ")
...
str.write(Name)
print str.getvalue()

The same way, you can construct your binary bytes with StringIO and write it into file once you are done.


bin=StringIO()
bin.write("/x5F/x5F%c" % 0xFF)
...
file = open ("my.bin","wb")
file.write(bin.getvalue())
file.close()
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7 Responses to “Python: Manipulate string or binary bytes with StringIO”

  1. André Says:
    November 25th, 2008 at 11:26 pm

    To import the StringIO Class:

    from StringIO import StringIO

    http://www.python.org/doc/2.5.2/lib/module-StringIO.html

  2. mysurface Says:
    November 26th, 2008 at 1:43 am

    Thanks André, forgot to mention how to import StringIO. :P

  3. kagesenshi Says:
    November 28th, 2008 at 8:48 pm

    i usually use

    str = ”
    str += ‘line 1\n’
    str += ‘line 2\n’
    str += ‘%s’ % 12345

    shorter :)

  4. Uh Clem Says:
    November 20th, 2010 at 2:37 am

    Unfortunately this forum is vulnerable to cheesy FFF spambots,
    although at least it seems that the links have been filtered out. Attaboy.

  5. mysurface Says:
    November 21st, 2010 at 11:34 am

    Thanks for pointing out, I was not aware about this previously.

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