.NET/ASP.NET/C#/VB.NET PDF Document SDK

Slicing is a very powerful feature, and it is made even more powerful by the fact that you can assign to slices: >>> name = list('Perl') >>> name ['P', 'e', 'r', 'l'] >>> name[2:] = list('ar') >>> name ['P', 'e', 'a', 'r'] So you can assign to several positions at once. You may wonder what the big deal is. Couldn t you just have assigned to them one at a time Sure, but when you use slice assignments, you may also replace the slice with a sequence whose length is different from that of the original: >>> name = list('Perl') >>> name[1:] = list('ython') >>> name ['P', 'y', 't', 'h', 'o', 'n'] Slice assignments can even be used to insert elements without replacing any of the original ones: >>> >>> >>> [1, numbers = [1, 5] numbers[1:1] = [2, 3, 4] numbers 2, 3, 4, 5]

winforms pdf 417 reader, winforms qr code reader, winforms upc-a reader, winforms data matrix reader, winforms gs1 128, winforms ean 13 reader, c# remove text from pdf, itextsharp replace text in pdf c#, winforms code 39 reader, itextsharp remove text from pdf c#,

If you re a lawyer, your column headings might be Case Theme, Explanation, and Evidence:

The latter example demonstrates how you can parenthesize elements of the regular expression to separate their contents in the results. m[0] contains the full match, whereas m[1] onwards matches each set of parentheses. This behavior is similar to that of $1, $2, $.. in Perl (note that these special variables also exist in Ruby, but their use is generally frowned upon unless there are no other solutions). You can also scan through a string, returning each match for a regular expression:

"this is a test".scan(/[aeiou]/)

If you re an analyst, your column headings might be Conclusion, Analysis, and Fact:

['i', 'i', 'a', 'e']

Here, I basically replaced an empty slice, thereby really inserting a sequence. You can do the reverse to delete a slice: >>> [1, >>> >>> [1, numbers 2, 3, 4, 5] numbers[1:4] = [] numbers 5] As you may have guessed, this last example is equivalent to del numbers[1:4].

"this is a test".scan(/\w+/)

If you re an executive, your column headings might be Summary, Breakdown, and Backup:

['this', 'is', 'a', 'test']

Methods such as split also accept regular expressions (as well as normal strings):

"this is a test".split(/\s/)

If you re a salesperson, your column headings might be Bene t, Feature, and Demonstration:

A method is a function that is tightly coupled to some object, be it a list, a number, a string, or whatever. In general, a method is called like this: object.method(arguments) As you can see, a method call looks just like a function call, except that the object is put before the method name, with a dot separating them. Lists have several methods that allow you to examine or modify their contents.

['this', 'is', 'a', 'test']

Integers and floating point numbers are available in Ruby and operate mostly as you d expect. Numbers support all common operators such as modulus (%), addition, subtraction, division, multiplication, and powers (**).

5

Note You can produce roots easily by raising a number to the power of 1/n. For example, you can find the

square root of 25 with 25 ** 0.5.

Figure 1-1. The IDLE interactive Python shell Once you ve got the IDLE interactive Python shell running, you can continue with the section The Interactive Interpreter, later in this chapter.

If you re a writer, your column headings might be Act, Scene, and Action:

A key consideration with numbers in Ruby is that unless you explicitly define a number as a floating point number, it won t be one unless it contains a decimal point. For example:

10 / 3

If you re a journalist, your column headings might be Lead, Body, and Detail: