Diigo Diary 06/28/2008

• 7. Input and Output

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  • The str() function is meant to return representations of
    values which are fairly human-readable, while repr() is
    meant to generate representations which can be read by the interpreter
    (or will force a SyntaxError if there is not equivalent
    syntax).
  • print repr(x).rjust(2), repr(x*x).rjust(3),
    … # Note trailing comma on previous line
    … print repr(x*x*x).rjust(4)
  • >>> for x in range(1,11):
    … print ‘%2d %3d %4d’ % (x, x*x, x*x*x)
  • open() returns a file
    object, and is most commonly used with two arguments:
    “open(filename, mode)“.
  • mode can be 'r' when
    the file will only be read, 'w' for only writing (an existing
    file with the same name will be erased), and 'a' opens the file
    for appending; any data written to the file is automatically added to
    the end. 'r+' opens the file for both reading and writing.
    The mode argument is optional; 'r' will be assumed if
    it’s omitted.
  • Python provides a standard module called
    pickle. This is an
    amazing module that can take almost
    any Python object (even some forms of Python code!), and convert it to
    a string representation; this process is called pickling.

• Test your web design in different browsers – Browsershots

  tags: browser, webdesign, tools, screenshots, testing, web, browsers

• Java开源大全

  tags: java, opensource, resources, list