By Paul Gerrard

Learn merely the basic elements of Python with out cluttering up your brain with beneficial properties you'll by no means use. This compact publication isn't a "best solution to write code" kind of booklet; quite, the writer is going over his most-used services, that are all you must understand as a newbie and a few manner beyond.

Lean Python takes fifty eight Python equipment and features and whittles them all the way down to 15: as writer Paul Gerrard says, "I have not stumbled on a necessity for the rest."

What you will Learn

  • Discover lean Python and the way to profit barely enough to construct priceless tools
  • Use Python gadgets, application constitution, I/O, modules and more
  • Handle error and exceptions
  • Test your code
  • Access the net; do looking; and persist data

Who This e-book Is For
This booklet is aimed toward 3 different types of reader: The skilled programmer – in the event you already comprehend a programming language, this e-book supplies a shortcut to knowing the Python language and a few of its layout philosophy.
You paintings in IT and want a programming primer – you are a tester who must have extra expert technical discussions with programmers. operating in the course of the examples can assist you to understand the problem of fine programming.
First-timer – you will want a primary booklet on programming for you to assimilate speedy that will help you make a decision even if programming is for you.

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L = len(names) # 3 Values in the preceding lists are accessed as shown in the following code fragments. names[1] mixedlist[0] mixedlist[3] mixedlist[2:4] elist[2] elist[3] elist[3][1] # # # # # # # 'Dick' 1 'four' [3,'four'] 3 [4,5,6] 5 If you try to access a nonexistent element in the list, you will get a 'list index out of range' error. Updating Lists Use the append() method to add entries to the end of a list. Use the del statement to delete an entry. 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.

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.

Return -1 # no - fail! nelems=0 # length zero ... for elem in seq: # for elem ... nelems+=1 # add one ... return nelems # length ... The header line has a distinct format: • The keyword def to signify it is a new function. • A function name lenDictList (that meets the variable naming rules). • Braces to enclose the arguments (none, 1 or more). • A colon to denote the end of the header line. The code inside the function is indented. The code uses the arguments in the function definitions and does not need to define them (they will be passed by the calling module).

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