Core Python Applications Programming 3rd ed (). For intermediate Python programmers — think "Core Python, Vol 2". Core Python Programming 2nd ed. First Edition December 14, ISBN: , In Core Python Programming, Internet software engineer and technical trainer Wesley .. Your first. Python application will be presented at the end of the chapter to give you an idea of what external third party modules such as the NumPy module and JPython. Core python applications programming (third edition) by Wesley J. Chun. Full Text: PDF .. Programming in CoffeeScript by Mark Bates.
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—Mitchell L. Model, MLM Consulting Core PYTHON Applications Programming Third Edition The Core Series Visit ronaldweinland.info for a complete list of. Dive into a variety of topics used in practice for real-world applications. PDF 下载地址( MB) In Core Python Applications Programming, Third Edition, leading Python developer and corporate trainer Wesley Chun helps you take your. xv. PREFACE. Welcome to the Third Edition of Core Python. Applications Programming! We are delighted that you have engaged us to help you learn Python as.
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If any return statement returns an expression, any return statements where no value is returned should explicitly state this as return None , and an explicit return statement should be present at the end of the function if reachable. String methods are always much faster and share the same API with unicode strings. Override this rule if backwards compatibility with Pythons older than 2.
Use ''. Object type comparisons should always use isinstance instead of comparing types directly. When checking if an object is a string, keep in mind that it might be a unicode string too! In Python 2, str and unicode have a common base class, basestring, so you can do:.
Note that in Python 3, unicode and basestring no longer exist there is only str and a bytes object is no longer a kind of string it is a sequence of integers instead. For sequences, strings, lists, tuples , use the fact that empty sequences are false. Don't write string literals that rely on significant trailing whitespace.
Such trailing whitespace is visually indistinguishable and some editors or more recently, reindent. With the acceptance of PEP , the style rules for function annotations are changing. In order to be forward compatible, function annotations in Python 3 code should preferably use PEP syntax. There are some formatting recommendations for annotations in the previous section. The experimentation with annotation styles that was recommended previously in this PEP is no longer encouraged.
However, outside the stdlib, experiments within the rules of PEP are now encouraged. For example, marking up a large third party library or application with PEP style type annotations, reviewing how easy it was to add those annotations, and observing whether their presence increases code understandability.
The Python standard library should be conservative in adopting such annotations, but their use is allowed for new code and for big refactorings. For code that wants to make a different use of function annotations it is recommended to put a comment of the form:. More fine-grained ways of disabling complaints from type checkers can be found in PEP Like linters, type checkers are optional, separate tools.
Python interpreters by default should not issue any messages due to type checking and should not alter their behavior based on annotations. Users who don't want to use type checkers are free to ignore them. However, it is expected that users of third party library packages may want to run type checkers over those packages.
For this purpose PEP recommends the use of stub files: Stub files can be distributed with a library, or separately with the library author's permission through the typeshed repo . For code that needs to be backwards compatible, type annotations can be added in the form of comments.
See the relevant section of PEP . PEP introduced variable annotations. The style recommendations for them are similar to those on function annotations described above:. Annotations for module level variables, class and instance variables, and local variables should have a single space after the colon.
If an assignment has a right hand side, then the equality sign should have exactly one space on both sides. Although the PEP is accepted for Python 3. Skip to content.
Style Guide for Python Code Author: Active Type: Process Created: Naming Styles Prescriptive: Introduction This document gives coding conventions for the Python code comprising the standard library in the main Python distribution. A Foolish Consistency is the Hobgoblin of Little Minds One of Guido's key insights is that code is read much more often than it is written.
In particular: Some other good reasons to ignore a particular guideline: When applying the guideline would make the code less readable, even for someone who is used to reading code that follows this PEP. To be consistent with surrounding code that also breaks it maybe for historic reasons -- although this is also an opportunity to clean up someone else's mess in true XP style.
Because the code in question predates the introduction of the guideline and there is no other reason to be modifying that code. When the code needs to remain compatible with older versions of Python that don't support the feature recommended by the style guide.
Code Lay-out Indentation Use 4 spaces per indentation level. Aligned with opening delimiter. Arguments on first line forbidden when not using vertical alignment. Acceptable options in this situation include, but are not limited to: No extra indentation.
Since both conditions are true, we can frobnicate. Tabs or Spaces?
Spaces are the preferred indentation method. Tabs should be used solely to remain consistent with code that is already indented with tabs. Python 3 disallows mixing the use of tabs and spaces for indentation. Maximum Line Length Limit all lines to a maximum of 79 characters. For example, long, multiple with -statements cannot use implicit continuation, so backslashes are acceptable: Another such case is with assert statements.
Make sure to indent the continued line appropriately. Here, the eye has to do extra work to tell which items are added and which are subtracted: Following the tradition from mathematics usually results in more readable code: Blank Lines Surround top-level function and class definitions with two blank lines.
Method definitions inside a class are surrounded by a single blank line. Use blank lines in functions, sparingly, to indicate logical sections. Open source projects with a global audience are encouraged to adopt a similar policy. Imports Imports should usually be on separate lines: Imports should be grouped in the following order: Standard library imports. Related third party imports. You should put a blank line between each group of imports.
Implicit relative imports should never be used and have been removed in Python 3. When importing a class from a class-containing module, it's usually okay to spell this: MyClass" and "foo. Module Level Dunder Names Module level "dunders" i. Python mandates that future-imports must appear in the module before any other code except docstrings: This module does stuff. String Quotes In Python, single-quoted strings and double-quoted strings are the same.
Whitespace in Expressions and Statements Pet Peeves Avoid extraneous whitespace in the following situations: Immediately inside parentheses, brackets or braces. Other Recommendations Avoid trailing whitespace anywhere. AnyStr, sep: Rather not: When to Use Trailing Commas Trailing commas are usually optional, except they are mandatory when making a tuple of one element and in Python 2 they have semantics for the print statement.
Comments Comments that contradict the code are worse than no comments. When writing English, follow Strunk and White. Block Comments Block comments generally apply to some or all code that follows them, and are indented to the same level as that code. Inline Comments Use inline comments sparingly. Don't do this: Documentation Strings Conventions for writing good documentation strings a. Note that most importantly, the """ that ends a multiline docstring should be on a line by itself: Naming Conventions The naming conventions of Python's library are a bit of a mess, so we'll never get this completely consistent -- nevertheless, here are the currently recommended naming standards.
Overriding Principle Names that are visible to the user as public parts of the API should follow conventions that reflect usage rather than implementation. Naming Styles There are a lot of different naming styles. The following naming styles are commonly distinguished: In addition, the following special forms using leading or trailing underscores are recognized these can generally be combined with any case convention: Naming Conventions Names to Avoid Never use the characters 'l' lowercase letter el , 'O' uppercase letter oh , or 'I' uppercase letter eye as single character variable names.
Package and Module Names Modules should have short, all-lowercase names. Class Names Class names should normally use the CapWords convention. Exception Names Because exceptions should be classes, the class naming convention applies here. Global Variable Names Let's hope that these variables are meant for use inside one module only. Function and Variable Names Function names should be lowercase, with words separated by underscores as necessary to improve readability.
Variable names follow the same convention as function names. Function and Method Arguments Always use self for the first argument to instance methods. Always use cls for the first argument to class methods.
Method Names and Instance Variables Use the function naming rules: Use one leading underscore only for non-public methods and instance variables. Constants Constants are usually defined on a module level and written in all capital letters with underscores separating words. Designing for Inheritance Always decide whether a class's methods and instance variables collectively: With this in mind, here are the Pythonic guidelines: Public attributes should have no leading underscores.
See the argument name recommendation above for class methods. Properties only work on new-style classes. Public and Internal Interfaces Any backwards compatibility guarantees apply only to public interfaces. The latter form is not legal Python 3 syntax. Proximity sensors, round design.
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