Step-by-step Python (1) Basic logic Control examples and coding style specifications

Source: Internet
Author: User

(1) Basic logic Control Example and coding style specification

1.while dead Loop

2.for Cycle

3.if,elif,else Branch Judgment

4. Coding style (official recommendation)

Version: Python3.4

1.while dead Loop

Import time >>> i = 0 while     1: ... + =      1 ... Print (i)     ... Time.sleep (3123^ctraceback (most recent)  :"<stdin>  " in <module>keyboardinterrupt

2.for Cycle

 for  in range (3): ...      Print ("" + str (     i)) ... + =      1 ... Print ("" +== 1= 1= 2= 2

3.if,elif,else Branch Judgment

 More if. py
x = Int (input ("Please enter an integer:"))ifX <0:x=0Print('negative changed to zero')elifx = =0:Print('Zero')elifx = = 1:    Print(' Single')Else:    Print(' More')
If-1if 0 if 1  if2 more

4. Coding style (official recommendation)

  • Use 4 spaces to indent rather than TAB.

    Between small indents (which can be nested deeper) and large indents (easier to read), 4 spaces are a good compromise. TAB has caused some confusion, preferably deprecated.

  • Wrap the line to make sure it doesn't exceed 79 characters.

    This helps small-screen users to read, or allows large displays to display several code files side-by-side.

  • Use empty lines to separate functions and classes, and large chunks of code in functions.

  • If possible, comment exclusive line

  • Working with document Strings

  • Place the space on either side of the operator and behind the comma, but no space is added to the brackets: a = f (1, 2) + g (3, 4) .

  • Uniform functions and class naming.

    The recommended class names are named with the hump , and the function and method names are underlined in lowercase _ and _ . Always use self as the first parameter of the method (for knowledge of classes and methods see First Class ).

  • Do not use fancy coding if the purpose of your code is to be in an internationalized environment. Python by default, UTF-8, even ordinary ASCII always works best.

  • Also, do not use identifiers that are non-ASCII characters unless the code is read or maintained in a different language.

Step-by-step Python (1) Basic logic Control examples and coding style specifications

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