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Like Perl, it s good at text processing and even general-purpose programming Python also has a good history in the realm of GUI-based application development Compared to Perl, Python has fewer users, but it is gaining acceptance as a practical rapid application development tool Unlike Perl, Python does not resemble C, and it doesn t resemble Unix-style tools like awk either Python was designed from scratch to be object oriented and has clear module semantics This can make it confusing to use, as the name spaces get complex to resolve On the other hand, this makes it much more structured, which can ease development for those with structured minds I m not aware of anything that is better in Python than in Perl They both share object features, and the two are almost identical in execution speed However, the reverse is not true: Perl has better regular expression features, and the level of integration between Perl and the Unix environment is hard to beat (although it can probably be solved within Python using a suitably written external module) In general, there is not a lot to tip the scales in favor of one of the two languages Perl will appeal to those people who already know C or Unix shell utilities Perl is also older and more widespread, and there is a much larger library of contributed modules and scripts Python, on the other hand, may appeal to those people who have experience with more object-oriented languages, such as Java or Modula-2 Both languages provide easy control and access when it comes to the external environment in which they work Perl arguably fills the role better, though, because many of the standard system functions you are used to are supported natively by the language, without requiring external modules The technical support for the two languages is also very similar, with both using websites and newsgroups to help users program in the new language Finally, it s worth mentioning that of all the scripting languages available, Perl and Python are two of the most stable platforms for development There are, however, some minor differences First, Perl provides quite advanced functions and mechanisms for tracking errors and faults in the scripts Making extensive use of these facilities can still cause problems, however For example, calling the system truncate() function within Perl will cause the whole interpreter to crash Python, on the other hand, uses a system of error trapping that will immediately identify a problem like this before it occurs, allowing you to account for it in your applications This is largely due to the application-development nature of the language.

actually imports the File/Basenamepm module on a Unix machine The use function also supports a number of pragmas small modules (typically with lowercase names) that control the execution and parsing of a Perl script For example, pragmas exist to switch on warnings or change the contents of the @INC array Generally, pragmas affect the entire execution of a script, but see 19 for full details

Create a compiler error concerning a final primitive Create an error concerning a final reference variable Attempt to change the state of an instance whose reference variable is final

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The no statement is the complete opposite of the use statement It unimports meanings that have been imported via the use statement It does this by calling a corresponding unimport method, if one has been defined, for a specified module If no unimport method has been defined, Perl quits with a fatal error Generally, no is only really required to switch off compiler pragmas, and we ll look at the use of the function in 18

The do statement is rather like a cross between eval and the require and use functions, although it is neither as practical nor user friendly as any of those functions The format for the command is

where EXPR is the name of a file to be executed The return value is taken as the evaluated value of the last statement in the file If the file is not in the current directory, then the paths specified in the @INC array are searched instead The main difference between do and require is that the file specified by do will be executed each time it is called The require function (and use), on the other hand, keeps track of the files it has imported and will only import a file once

When you create a variable, it s created within the scope of the current package In the case of the main package, it means that you are creating a global variable Although packages allow you to split up the global variables that you create into different sections, many programs would be difficult to work with if we had to keep giving unique names to all the variables we used For that reason, Perl also allows us to create variables that are lexically scoped that is, they are declared as existing only until the end of the innermost enclosing scope, which is either a block, a file, or an eval statement In fact, Perl supports three scoping declarations that enable us to create private variables (using my), selectively global variables (using our), and temporary copies of selected global variables (using local) At the simplest level, you just prefix the variable with the declaration keyword:

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