Python core programming Reading Pen 2

Chapter III Python Basics

I. Statements and syntax

\ n Standard Line delimiter

\ Continue on line

; Connect two statements to one line

: Separate the head and body of the code block

Code blocks are represented as indented blocks

Python files are organized in a modular format

Ii. Assigning values to variables

Note: Objects in Python are passed by reference!

Python does not support self-increment/decrement operators such as ++x/post

Multivariate assignment: Assigning multiple variables at the same time

>>>x,y,z =, ' string ' #其实多元赋值的 = both sides are tuples

or write:

>>> (x, y, Z) = (1, 2, ' string ') clearer

The value of two variables without an intermediate variable is implemented in a multi-assignment way:

>>>x,y =

>>>x,y = Y,x

Third, identifiers

Python core programming Reading Pen 2