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Both lines of text are printed to sysstdout, a le object that represents the standard output stream this is normally the console and differs from sysstderr, the error output stream only in that the latter is unbuffered (Python automatically creates and opens sysstdin, sysstdout, and sysstderr at program start-up) The print() function adds a newline by default, although we can stop this by giving the end keyword argument set to an empty string In some situations it is useful to be able to capture into a string the output that is intended to go to a le This can be achieved using the ioStringIO class which provides an object that can be used just like a le object, but which holds any data written to it in a string If the ioStringIO object is given an initial string, it can also be read as though it were a le We can access ioStringIO if we do import io, and we can use it to capture output destined for a le object such as sysstdout:

An array creation expression creates an object that is a new array whose elements are of the type speci ed by the PrimitiveType or ClassOrInterfaceType It is a compile-time error if the ClassOrInterfaceType does not denote a rei able type ( 47) Otherwise, the ClassOrInterfaceType may name any named reference type, even an abstract class type ( 8111) or an interface type ( 9)

final static int NO_PASSWORD_CONTROLS = 0; final static int PASSWORD_EXPIRED = -1;

sysstdout = ioStringIO()

The rules above imply that the element type in an array creation expression cannot be a parameterized type, other than an unbounded wildcard

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If this line is put at the beginning of a program, after the imports but before any use is made of sysstdout, any text that is sent to sysstdout will actually be sent to the ioStringIO le-like object which this line has created and which has replaced the standard sysstdout le object Now, when the print() and sysstdoutwrite() lines shown earlier are executed, their output will go to the ioStringIO object instead of the console (At any time we can restore the original sysstdout with the statement sysstdout = sys__stdout__) We can obtain all the strings that have been written to the ioStringIO object by calling the ioStringIOgetvalue() function, in this case by calling sysstdoutgetvalue() the return value is a string containing all the lines that have been written This string could be printed, or saved to a log or sent over a network connection like any other string We will see another example of ioStringIO use a bit further on ( 227)

First the possible exceptions on authenticating must be examined:

Dims [ ]

If we need a program to be able to process text that may have been redirected in the console or that may be in les listed on the command line, we can use the fileinput module s fileinputinput() function This function iterates over all the lines redirected from the console (if any) and over all the lines in the les listed on the command line, as one continuous sequence of lines The module can report the current lename and line number at any time using fileinputfilename() and fileinputlineno(), and can handle some kinds of compressed les Two separate modules are provided for handling command-line options,

The type of the creation expression is an array type that can denoted by a copy of the creation expression from which the new keyword and every DimExpr expression and array initializer have been deleted For example, the type of the creation expression:

try { ldauthenticate( 3, DN, PW ); Systemoutprintln( "Authentication successful" ); } catch( LDAPException e ) { if ( egetLDAPResultCode() == LDAPExceptionINVALID_CREDENTIALS ) { Systemoutprintln( "Invalid credentials" ); } else if ( egetLDAPResultCode() == LDAPExceptionNO_SUCH_OBJECT ) { Systemoutprintln( "No such user" ); } else { Systemoutprintln( "Error on authentication: " + etoString() ); } }

Back in 2 we described the csv2htmlpy program In that chapter s exercises we proposed extending the program to accept the command-line arguments, maxwidth taking an integer and format taking a string The model solution (csv2html2_anspy) has a 26-line function to process the arguments Here is the start of the main() function for csv2html2_optpy, a version of the program that uses the optparse module to handle the command-line arguments rather than a custom function:

new double[3][3][]

On success, a check is made to see if any password expiration controls were returned If a password-expiring control was returned, the number of seconds until expiration is extracted:

def main(): parser = optparseOptionParser() parseradd_option("-w", "--maxwidth", dest="maxwidth", type="int", help=("the maximum number of characters that can be " "output to string fields [default: %default]")) parseradd_option("-f", "--format", dest="format", help=("the format used for outputting numbers " "[default: %default]")) parserset_defaults(maxwidth=100, format="0f") opts, args = parserparse_args()

double[][][]

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