How to assign a value to a variable in python

Python can assign values ​​through basic variable assignments, multiple assignments, incremental assignments, compound assignment operators, and global and local variables. Detailed introduction: 1. The basic variable assignment steps are to assign numbers to variables, assign strings to variables, assign Boolean values ​​to variables, and assign lists to variables; 2. The multiple assignment steps are to exchange variable values ​​and return from the function. Multiple values; 3. Incremental assignment, such as addition, subtraction and other operations; 4. Compound assignment operators, etc.

The operating system for this tutorial: Windows 10 system, Python version 3.11.4, DELL G3 computer.

Python is a simple and easy-to-learn programming language, and its variable assignment is also very intuitive and flexible. Below I will introduce in detail how to assign variables in Python.

In Python, variable assignment is done by assigning a value or expression to a variable. Python Variable names can contain letters, numbers, and underscores, but cannot start with numbers, and are case-sensitive. The following are commonly used variable assignment methods in Python:

1. Basic variable assignment:

# 将数字赋给变量
num = 10
# 将字符串赋给变量
name = "Alice"
# 将布尔值赋给变量
is_valid = True
# 将列表赋给变量
data = [1, 2, 3, 4, 5]

2. Multiple assignment: Python allows simultaneous Assigning values ​​to multiple variables makes it easier to swap variable values ​​or return multiple values ​​from a function.

# 多重赋值
a, b, c = 1, 2, 3
# 交换变量值
a, b = b, a
# 从函数返回多个值
def get_info():
return "Alice", 25
name, age = get_info()

3. Incremental assignment: Python provides a concise way to incrementally assign variables, such as addition, subtraction and other operations.

# 增量赋值
count = 0
count += 1 # 相当于 count = count + 1
total = 10
total -= 3 # 相当于 total = total - 3

4. Compound assignment operators: Python provides a series of compound assignment operators, such as =, -=, *=, /=, etc., which enable operations and sums to be performed on variables. Assignment operations are simpler.

# 复合赋值运算符
num = 6
num += 4 # 相当于 num = num + 4
price = 100
price *= 0.9 # 相当于 price = price * 0.9

5. Global variables and local variables: The assignment method of variables may be different inside and outside the function. Inside a function, you can use global The keyword declares a global variable, or you can directly assign a value to create a local variable.

global_var = 10 # 全局变量
def my_function():
local_var = 20 # 局部变量

The above is the common variable assignment method in Python. Variable assignment in Python is very simple and flexible, making writing code more efficient and comfortable. Hope this information is helpful to you!

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