Факториал

import math
n = int(input('Fact: '))
res = math.factorial(n)
print(res)

from math import factorial
 
print(f"{factorial(int(input()))}")

from functools import reduce
 
def fact_1(n):
    return reduce(lambda acc,x : x*acc, range(1,n+1))
    
def fact_2(n):
    p=1
    for i in range(2,n+1):
        p*=i
    return p    
    
print(fact_1(int(input()))  
print(fact_2(int(input()))

>>> factorial = lambda x: 1 if x<1 else factorial(x-1)*x
>>> factorial(5)
120
>>> factorial(10)
3628800

n = int(input())
 
fact = 1
while n > 1:
    fact *= n
    n -= 1
 
print(fact)

print((lambda n,f : 1 if n==1 else n*f(n-1,f)) (5,(lambda n,f : 1 if n==1 else n*f(n-1,f))))
 
>>> 120

In [1]: (lambda factorial, x: factorial(factorial, x))(lambda factorial, x: 1 if x == 0 else factorial(factorial, x - 1) * x, 5)
Out[1]: 120

import math
print(math.factorial(int(input())))

n = int(input())
if n == -1 or n == 1:
    print(1)
elif n > 1:
    factorial = 1
    for i in range(2, n + 1):
        factorial *= i
    print(factorial)
elif n == 0:
    print('1')

print((lambda f: f(f))(lambda g: lambda x: x and x * g(g)(x - 1) or 1)(int(input())))