Python| sympy.factorint() 方法

借助sympy.factorint()方法，我们可以找到给定整数的因子及其对应的重数。对于小于 2 的输入， factorint()的行为如下：

• $factorint(1)$ – 返回空分解{}。
• $factorint(0)$ – 返回${0:1}$ .
• $factorint(-n)$ - 添加$-1:1$先到因数再因数$n$ .

Syntax:
factorint(n)

Parameter:
n – It denotes an integer.

Returns:
Returns a dictionary containing the prime factors of n as keys
and their respective multiplicities as values.

示例 #1：

# import factorint() method from sympy
from sympy import factorint
  
n = 2**3 * 3**4 * 5**6
  
# Use factorint() method 
factor_dict = factorint(n) 
      
print("Dictionary containing factors of {} with respective multiplicities : {}".
      format(n, factor_dict))

输出：

Dictionary containing factors of 10125000 
with respective multiplicities : {2: 3, 3: 4, 5: 6}

示例 #2：

# import factorint() method from sympy
from sympy import factorint
  
n = 6**4 * 13
  
# Use factorint() method 
factor_dict = factorint(n) 
      
print("Dictionary containing factors of {} with respective multiplicities : {}".
      format(n, factor_dict))

输出：

Dictionary containing factors of 16848 
with respective multiplicities : {2: 4, 3: 4, 13: 1}