Python math.perm() Method
Python math ModulePython math.perm(x, i)The method returns the total number of ways to choose k items from n items without repetition and with order.
Note: The k parameter is optional. If we don't set k, this method will return n! (for example, math.perm(7) will return 5040).
Python Version: 3.8
Syntax
The syntax of the math.perm() method is as follows:
math.perm(n, k)
Parameter Description:
- x-- Required, a positive number. If the value is not a number, a TypeError is returned.
- k-- Optional, a positive number. If the value is not a number, a TypeError is returned.
Note: If k is greater than n, it returns 0.
Note: If n or k is negative, a ValueError occurs. If n or k is not an integer, a TypeError occurs.
Return Value
An integer int, returning the total number of ways to choose k items from n items without repetition and with order.
Example
The following example calculates the total number of ways to choose k items from n items:
Example
# Import the math package
import math
# Initialize n
n = 7
# Initialize k
k = 5
# Output the total number of ways to choose k items from n items
print (math.perm(n, k))
import math
# Initialize n
n = 7
# Initialize k
k = 5
# Output the total number of ways to choose k items from n items
print (math.perm(n, k))
Output result:
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