Python Getting Started tutorial learn notes # # Basic section

3.1 Data types

• Number (numeric) int, float, bool, complex (plural) int, expressed as a long integer and no long in Python2. There is no Boolean type in Python2, it is represented by the number 0 flase
• String (string) the strings in Python are enclosed in single quotation marks (') or double quotation marks ("), and use backslashes (\) to escape special characters.

3.2 Data Structures

list, denoted by [], lists can be used in many ways, such as indexing and interception. list=[a,b,1,2,3,4]

Tuples, tuples cannot be changed, and () indicate that elements are separated by commas. tup = (1, 2, 3, 4, 5, 6). Functions are returned in tuples

A dictionary, which is a type of mapping, represented by {}, is an unordered collection of objects. Dict={key:value,key2,value2}

Collection, which is a sequence of unordered repeats, denoted by {}, or set () function. Parame={value1,value2}

3.3 Data operations

Arithmetic operations, subtraction

Compare operations, compare sizes

Assignment operations, assigning values or references to variables

bitwise operations, by and or non-arithmetic, move the number of bits

Logical operations, logical Boolean values

Member scatter, in or not in, query member

Identity operation, is or not is, querying identities, comparing storage units of two objects

Python Getting Started tutorial learn notes # # Basic section