By Paul Gerrard
Study purely the basic elements of Python with no cluttering up your brain with positive factors you'll by no means use. This compact ebook isn't really a «best method to write code» form of e-book really, the writer is going over his most-used capabilities, that are all you want to be aware of as a newbie and a few approach past. Lean Python takes fifty eight Python equipment and services and whittles them right down to 15: as writer Paul Gerrard says, «I havent stumbled on a necessity for the rest.» What Youll examine become aware of lean Python and the way to benefit barely enough to construct helpful instruments Use Python gadgets, application constitution, I/O, modules and extra deal with blunders and exceptions attempt your code entry the net do looking out and persist information
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Additional info for Lean Python Learn Just Enough Python to Build Useful Tools
Example text
Append('Harry') # # # # # Change an entry mylist[1]='Bill' # ['Tom','Bill','Harry'] # Delete an entry del mylist[1] an empty list ['Tom'] ['Tom','Dick'] ['Tom','Dick','Harry'] # ['Tom','Harry'] Indexing Whereas the membership (in, not in) operators return a Boolean True or False, the index() method finds an entry in your list and returns the offset of that entry. If the entry cannot be found, it returns an error. index('Henry') # 1 # ValueError: Henry # not in list 21 CHAPTER 2 ■ PYTHON OBJECTS Sequence Operations and Functions The sequence operators—comparisons, slices, membership, and concatenation—all work the same as they do with strings.
Py; the name of the module in your code will be mod1. py. Let’s look at some example code in each file. evening() Now, you can see in line 1 that we have imported mod1 as m1. This means that the code in module mod1 is referenced using the m1 prefix. If we had just imported the module, we would use the prefix mod1. py hello written by Paul Good Morning! Good Evening! py). py hello written by xxx Paul Good Morning! Good Evening! You can see that the import format allows us to drop the prefix for the imported functions.
Entries in a dictionary. • Rows of data in a database. • Lines of text in a disk file. These constructs, usually called loops, perform a defined code block repeatedly on some item of data until some condition or test is met (or not met). These loops are implemented using for and while statements. 27 CHAPTER 3 ■ PROGRAM STRUCTURE For Statement The for statement acts as a header statement for a code block that is to be executed until some condition is met. The for statement operates on an iterable set of elements, often a sequence.