What is ** in python

In Python, the double asterisk "**" exponent operator is used to perform exponentiation or exponentiation operations: 1. When the double asterisk is used between two numbers, it means that the first number is used as The base, the second number is used as an exponent for exponentiation; 2. Calculate the square root or cube root of a number.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In Python, the double asterisk (**) is the exponential operator, used to perform exponentiation or exponentiation operations.

When double asterisks are used between two numbers, it means that the first number is used as the base and the second number is used as the exponent for the power operation. For example, the result of 2 ** 3 is 8, which means 2 raised to the third power.

Double asterisks can also be used in power arithmetic applications, such as calculating the square root or cube root of a number. For example, the result of 4 ** 0.5 is 2.0, which represents the square root of 4; the result of 8 ** (1/3) is 2.0, which represents the cube root of 8.

1. Power operation:

a = 2
b = 3
result = a ** b
print(result)  # 输出 8，表示2的3次方

2. Keyword parameter unpacking:

def my_func(a, b):    
print("a =", a)    
print("b =", b)
params = {'a': 10, 'b': 20}
my_func(**params)

The output result is:

a = 10
b = 20

In the above code, the double asterisk unpacks the dictionary params into keyword parameters and passes the key-value pairs in params as parameters to the function my_func. Therefore, when the function is called, it is equivalent to my_func(a=10, b=20). In this way, the function receives the corresponding value and prints it out.

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