Lines and indents ：
python The most distinctive feature is the use of indentation to represent code blocks , You don't need braces {} .
The number of indented spaces is variable , But the statements of the same code block must contain the same number of indented spaces
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Multi line statement ：
Python It's usually a sentence written one line at a time , But if the sentence is long , We can use backslash (\) To implement multiline statements
stay [], {}, or () Multiple lines in , No need to use backslash (\)
String truncation ：
grammar ： Variable [ Header subscript ： Tail subscript ： step ]
Blank line ：
Functions or methods of classes are separated by empty lines , Represents the beginning of a new piece of code . Classes and function entries are also separated by a blank line , To highlight the beginning of the function entry .
Blank lines are not the same as code indentation , Air travel is not Python Part of grammar . Don't insert blank lines when writing ,Python The interpreter will not run wrong . But blank lines are used to separate two pieces of code with different functions or meanings , Easy to maintain or refactor the code in the future .
Multiple statements make up a code group ：
Indent the same set of statements into a block of code , I call it code .
image if ,while,def and class Such a compound sentence , The first line starts with keywords , And colon （：） end , One or more lines of code following this line form a code group .
import And from...import
Import the whole module into （somemodule）, Format import somemodule
Import a function from a module , Format ：from somemodule import somefunction
Import multiple functions from a module , The format is ： from somemodule import firstfunc, secondfunc, thirdfunc
Import all functions of a function into , Format from somemodule import *
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