A Byte of Python by Swaroop C H

By Swaroop C H

‘A Byte of Python’ is a loose publication on programming utilizing the Python language. It serves as an instructional or advisor to the Python language for a newbie viewers. If all you recognize approximately desktops is tips to keep textual content documents, then this is often the e-book for you. This ebook is written for the newest Python three, although Python 2 is the widely discovered model of Python this day (read extra approximately it in Python 2 as opposed to three section).

This ebook is a re-package model of unique document(by Swaroop C H).

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Import syntax. py. The dir() function You can use the built-in dir function to list the identifiers that a module defines. The identifiers are the functions, classes and variables defined in that module. When you supply a module name to the dir() function, it returns the list of the names defined in that module. When no argument is applied to it, it returns the list of names defined in the current module. 4. Using the dir function $ python >>> import sys >>> dir(sys) # get list of attributes for sys module ['__displayhook__', '__doc__', '__excepthook__', '__name__', '__stderr__', '__stdin__', '__stdout__', '_getframe', 'api_version', 'argv', 'builtin_module_names', 'byteorder', 'call_tracing', 'callstats', 'copyright', 'displayhook', 'exc_clear', 'exc_info', 'exc_type', 'excepthook', 'exec_prefix', 'executable', 'exit', 'getcheckinterval', 'getdefaultencoding', 'getdlopenflags', 'getfilesystemencoding', 'getrecursionlimit', 'getrefcount', 'hexversion', 'maxint', 'maxunicode', 'meta_path','modules', 'path', 'path_hooks', 'path_importer_cache', 'platform', 'prefix', 'ps1', 'ps2', 'setcheckinterval', 'setdlopenflags', 'setprofile', 'setrecursionlimit', 'settrace', 'stderr', 'stdin', 'stdout', 'version', 'version_info', 'warnoptions'] >>> dir() # get list of attributes for current module ['__builtins__', '__doc__', '__name__', 'sys'] >>> >>> a = 5 # create a new variable 'a' >>> dir() ['__builtins__', '__doc__', '__name__', 'a', 'sys'] >>> >>> del a # delete/remove a name >>> >>> dir() ['__builtins__', '__doc__', '__name__', 'sys'] >>> How It Works First, we see the usage of dir on the imported sys module.

You can see this by running print someFunction() where the function someFunction does not use the return statement such as: def someFunction(): pass The pass statement is used in Python to indicate an empty block of statements. DocStrings Python has a nifty feature called documentation strings which is usually referred to by its shorter name docstrings. DocStrings are an important tool that you should make use of since it helps to document the 38 Functions program better and makes it more easy to understand.

We can access the items in the tuple by specifying the item's position within a pair of square brackets just like we did for lists. This is called the indexing operator. We access the third item in new_zoo by specifying new_zoo[2] and we access the third item in the third item in the new_zoo tuple by specifying new_zoo[2][2]. This is pretty simple once you've understood the idiom. Tuple with 0 or 1 items. An empty tuple is constructed by an empty pair of parentheses such as myempty = (). However, a tuple with a single item is not so simple.

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