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Be aware, however, that those who write programs that are internationalized often use _ as the name of their translation function They do this so that instead of writing gettextgettext("Translate me"), they can write _("Translate me") (For this code to work we must have rst imported the gettext module so that we can access the module s gettext() function) Let s look at some valid identi ers in a snippet of code written by a Spanishspeaking programmer The code assumes we have done import math and that the variables radio and vieja_ rea have been created earlier in the program: = mathpi = 00000001

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The following cause compile-time errors because we cannot be sure they will succeed, depending on the run-time type of p; a run-time check will be necessary for the needed narrowing conversion and must be indicated by including a cast: = p; // p might be neither a ColoredPoint // nor a subclass of ColoredPoint c = p; // p might not implement Colorable

196

Here is another example involving assignment of array objects:

private String _userKey = null; private boolean _isInitialized = false; private Hashtable _changed = new Hashtable();

nueva_ rea = * radio * radio if abs(nueva_ rea - vieja_ rea) < : print("las reas han convergido")

class Point { int x, y; }

// Extract the jpegPhoto attribute LDAPAttribute attr = entrygetAttribute( ATTRS[0] ); if ( attr != null ) {

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.net ean 13 reader

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We ve used the math module, set epsilon ( ) to be a very small oating-point number, and used the abs() function to get the absolute value of the difference between the areas we cover all of these later in this chapter What we are concerned with here is that we are free to use accented characters and Greek letters for identi ers We could just as easily create identi ers using Arabic, Chinese, Hebrew, Japanese, and Russian characters, or indeed characters from any other language supported by the Unicode character set

class ColoredPoint extends Point { int color; }

The code that follows reads the jpegPhoto attribute and gets the values as an enumerated list using getByteValues, although we will use only the rst one (if there is more than one value) Once the data is in a byte array, it can be treated just as if it had been read from the disk

The easiest way to check whether something is a valid identi er is to try to assign to it in an interactive Python interpreter or in IDLE s Python Shell window Here are some examples:

In this example:

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>>> stretch-factor = 1 SyntaxError: can't assign to operator () >>> 2miles = 2 SyntaxError: invalid syntax () >>> str = 3 # Legal but BAD >>> l'imp t31 = 4 SyntaxError: EOL while scanning single-quoted string () >>> l_imp t31 = 5 >>>

The value of veclong cannot be assigned to a Long variable, because Long is a class type other than Object An array can be assigned only to a variable of a compatible array type, or to a variable of type Object, Cloneable or javaioSerializable The value of veclong cannot be assigned to vecshort, because they are arrays of primitive type, and short and long are not the same primitive type The value of cpvec can be assigned to pvec, because any reference that could be the value of an expression of type ColoredPoint can be the value of a variable of type Point The subsequent assignment of the new Point to a component of pvec then would throw an ArrayStoreException (if the program were otherwise corrected so that it could be compiled), because a

// Get the values as byte arrays Enumeration enumVals = attrgetByteValues(); // Get the first value - if there s more // than one if ( enumValshasMoreElements() ) { theLDAPPhoto = (byte[])enumValsnextElement(); } } else { Systemoutprintln( "No photo in the " + "directory for " + DNRead ); }

When an invalid identi er is used it causes a SyntaxError exception to be raised In each case the part of the error message that appears in parentheses varies, so we have replaced it with an ellipsis The rst assignment fails because - is not a Unicode letter, digit, or underscore The second one fails because the start character is not a Unicode letter or underscore; only continuation characters can be digits No exception is raised if we create an identi er that is valid even if the identi er is the name of a built-in data type, exception, or function so the third assignment works, although it is ill-advised The fourth fails because a quote is not a Unicode letter, digit, or underscore The fth is ne

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