Python 3 Program Development Guide (2nd edition revision) Notes

Python 3 Program Development Guide (2nd edition revision)Directory

• 1 process-oriented programming Quick Start
• 2 Data Type
• 3 Combination Type
• 4 control structures and functions
• 5 Module
• 6 OOP
• 7 file Processing
• 8 Advanced Programming Techniques
  • 8.1 FP
• 9 commissioning, testing and profiling
• Ten Processes and Threads
• One Network
• A Database
• - Regular Expressions
• - Analysis Introduction
  • 14.1 pyparsing
  • 14.2 PLY
• the GUI

process-oriented programming Quick Start

1. For in
2. Try except as

Data Type

1. Sys.float_info.epsilon
2. Seq[start:end] actually represents [Start, end] interval, s[:] equivalent to S[0:len (s)]
   1. Inconsistency: When using negative step, start defaults to -1:s[::-2]
3. Strtemplate.format (Agr0, arg2, name1=value1,...)
   1. {0} {1} {2} ...
   2. {name1} {name2} ...//Mix the numbering parameter in front, the named parameter is placed in the back
   3. Use local variables in the current scope range? **locals ()//locals () returns a dictionary, * * split it

Combination Type

1. Sequence: ByteArray, Bytes, list, str, tuple
   1. Collections.namedtuple
   2. List split: first, *rest = [1,2,3,4]
   3. List understanding: [Expr for I in L]
2. Set: Set
   1. Set understanding: {Expr for i in S}
3. Mapping: 3.0 dict, collections.defaultdict,3.1 collections. Ordereddict
   1. SetDefault: Prevents d[k]+=1 such a grammar from being thrown keyerror the first time it is called

control structures and functionsModuleOOPfile Processing

1. Bytes.fromhex?
2. F.seekable ()

Advanced Programming Techniques

1. Generator: The creator uses yield to return lazily, and the caller for in gets the
   1. Reset Current Value: Generator.send (Val), Val as result of yield expression accepted
2. Dynamic Import Module: The most primitive method
   1. Code = open (filepath, "R", encoding= "UTF8"). Read ()
   2. module = Type (SYS) (name)
   3. Sys.modules[name] = module
   4. EXEC (code, MODULE.__DICT__)
3. Adorner: high-order function, Original_func--and Wrapped_func (here's a major obstacle to understanding is *args, **kwargs parameter syntax)
   1. Function Note: __annotations__
4. functor:__call__
5. Context Manager: With expr as Var:suite
   1. The result of expr return must implement __enter__ __exit__, such as the file object returned by open ()
6. Descriptor *:__get__ __set__ __delete__
   1. __slots__ = ()
7. Class Decorator:---Class '
   1. Nonlocal
8. ABC (abstract base class)
9. Meta-class (? ）

FP

1. Functools.partial
2. @coroutine: Call the built-in next () for the coprocessor to execute to the first yield and wait for
   1. Composition Line *

commissioning, testing and profiling

1. p366 Python 3 is one of the advantages of distinguishing between str and bytes?
2. Python 3.0 Exception chain support: Raise Newexception (...) from err

Processes and ThreadsNetworkDatabaseRegular Expressions

1. Negative outlook: (?! E
2. M.span (g): Returns the starting accept index position of the group G in the text (start,end)

Analysis Introductionpyparsing

1. Elements: Literal (), Supress (), Keyword () (must match all words)
   1. Word ("abc") matches Abacus?
   2. Charsnotin () Skipto () Regex ()
   3. Forward () empty elements?
2. Quantification: Optional (), Zeroormore (), Oneormore (), Group (), Combine ()
3. The customary method of dealing with BNF:
   1. Do not write Item | Empty (), but optional (item)
   2. Variable list: var_list = variable + zeroormore (supress (",") +variable)
4. Set action:. Setparseaction (lambda tokens: ...)
5. Analyze first-order logic *:
   1. Example: (ForAll x:exists y:true), True & ~true-True
   2. Parseelement.enablepackrat ()

PLY

1. T_tokenname P_bnf_rule ...

GUI

Python 3 Program Development Guide (2nd edition revision) Notes