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Variables are containers for storing data in python, and data types define the types of values that can be stored in variables. Python Variables do not need to declare a type, but are inferred based on the assigned value.
Python data types
Python has a variety of built-in data types, including:
Data manipulation
Python provides a wide range of data manipulation operators and functions for manipulating data in variables:
Arithmetic operators:
Comparison operators:
Logical Operators:
Member operator:
Assignment operator:
Type conversion
Python can use the built-in functions int(), float(), str(), etc. to convert data from one type to another:
x = 10 y = str(x)# 转换为字符串 print(type(y))# <class "str">
String operations
Python provides a wide range of functions and methods for string manipulation:
List operations
List is the most commonly used mutable sequence type in Python:
Tuple operations
Tuples are immutable sequence types, similar to lists, but cannot be modified:
my_tuple = (1, 2, 3) my_tuple[0] = 4# AttributeError: "tuple" object does not support item assignment
Dictionary operations
A dictionary is a mapping type in Python that maps keys to values:
Collection operations
A collection is an unordered collection data type, which does not contain duplicate elements:
Selection of data structure
Choosing the right variable types and operations in Python is crucial. Think about the type of data in the variable, how it will be used, and the performance required.
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