Python3 Basics of Getting Started

1. View Python version

Python-v

2. Specify the encoding format for Python files

#-*-Coding:utf-8-*-

3. The variable name begins with a letter and an underscore (_)

_num num

4. Comment # begins with a comment on the line

# Here is the comment section

5, multi-line statement with backslash (\) Implementation

Toatl = Num1 + \

Num2 + \

Num3

6. Data type: Number (integer, Boolean, floating-point, plural), string (string), List (list []), tuple (tuple ()), sets (set {}), Dictionary (dictionary)

Number: Integer (1), floating-point number (1.23), complex number (1+2J)

String: element cannot be changed, can be sliced

List: Elements can be changed, can be sliced

Tuple: element cannot be changed, can be sliced, a tuple containing an element should be followed by a comma, such as Tup = (1,)

Set: unordered non-repeating element sequence, creating an empty collection must set () instead of {}

Dictionary: Unordered key (key): value pairs the set, key (key) is immutable type, create empty dictionary with {}

7. String

Single and double quotation marks for single-line strings (using the same)

Specify multiple lines of string between three quotation marks ("' or" ")

Natural string, preceded by the string R or r,r "Hello World \ n", will not be escaped and displayed as Hello World \ n

8, the same line shows more than one statement, separated by a semicolon (;) between statements

x = 3; y = 4

9. Data type conversion

Returns a new object as a function name, simple as int (x), float (x), str (x), etc.

Python3 Basics of Getting Started