Download Learn Python the Hard Way (1st Edition) by Zed A. Shaw PDF

By Zed A. Shaw

ISBN-10: 0557798191

ISBN-13: 9780557798193

Study Python The demanding manner is a publication I wrote to educate programming to those who don't know easy methods to code. It assumes you're most likely an influence person of your machine, after which takes you from not anything to programming basic video games. After interpreting my publication you need to be prepared for plenty of of the opposite programming books in the market.

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Extra resources for Learn Python the Hard Way (1st Edition)

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Quantifier. findall("aba") ['a', '', 'a', ''] Basically, both of them match the expression even though the preceding regex is not found: a a* Match a b a* Match ‘’ a a* Match a $ a* Match ‘’ findall matching process First, the regex matches the character a, then it follows with b. There is a match due to the * quantifier, the empty string. After that, it matches another a and finally it tries to match $. As we've mentioned before, even though you can't see $, it's a valid character for the regex engine.

If it's invoked with no arguments or zero, it will return the entire match; while if one or more group identifiers are passed, the corresponding groups' matches will be returned. search("Hello⇢world") The pattern matches the whole string and captures two groups, Hello and world. Once we have the match, we can see the the following concrete cases: • With no arguments or zero, it returns the entire match. group(0) 'Hello⇢world' • With group1 bigger than 0, it returns the corresponding group. group(2) 'world' • If the group doesn't exist, an IndexError will be thrown.

In the next chapter, we are going to jump over to Python to start practicing with the re module. [ 23 ] Regular Expressions with Python In the previous chapter, we've seen how generic regular expressions work. In this chapter, we walk you through all the operations Python provides us with to work with regular expressions and how Python deals with them. To do so, we will see the quirks of the language when dealing with regular expressions, the different types of strings, the API it offers through the RegexObject and MatchObject classes, every operation that we can do with them in depth with many examples, as well as some problems generally faced by users.

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