How to multiply numbers in a range in python

I am brand new to Python, and I'm currently taking a free online course.

I'm stuck trying to figure out how to code this simple optional problem found in my course:

[ ] using range(x) multiply the numbers 1 through 7

1x2x3x4x5x6x7 = 5040

I have made a variable for the range, 7, and a variable for the product used in the loop:

x = 7
product = 0

for item in range(x):

This is where I'm stuck. I try things in the loop like:

product = item * item

which doesn't even make any sense. I'm having a total mental block right now. I realize this should be an easy thing to do, but can't for whatever reason. I've tried making other variables like "number" and "previous_number" to make things easier for me, but I just get confused.

I need to use a for loop in this solution. I'm just not understanding the logic right now. A solution and explanation would be great! Please help!

asked Jul 12, 2017 at 20:43

1

Check this out:

answer = 1

for i in range(1,8):
    print("Right now, answer is", answer)
    print("Right now, i      is", i)
    print("I am going to multiply answer ({}) with i ({}) and store the result in answer".format(answer, i))
    answer = answer * i
    print("Now, answer is", answer)

print("Finally, answer is", answer)

answered Jul 12, 2017 at 20:51

inspectorG4dgetinspectorG4dget

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1

You need to initialise product = 1 (as 1 is the multiplicative identity) and inside your loop you simply need:

product *= item

which is short hand for:

product = product * item

In python there is also a reduce function that handles these types of questions:

In []:
import operator as op
import functools as ft

x = 7
ft.reduce(op.mul, range(1,x+1))

Out:
5040

answered Jul 12, 2017 at 21:02

AChampionAChampion

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Try something like this:

x = 7
product = 1

for item in range(1, x + 1):
    product = item * product

print(product)

Note that product starts at one and the range function starts at one as well. Otherwise item will continue to be multiplied by zero.

answered Jul 12, 2017 at 20:50

digit = range(1,8)    
print("digit", list(digit))  
product = 1   
for item in digit:  
    product = product * item  
    print("product is",product)  

answered May 19, 2018 at 10:12

1

multiplication = 1
for number in range(1,8):
    multiplication *= number
digits = list(range(1,8))
print("Multiply these numbers in sequence: ", digits, "=", multiplication)

Tomerikoo

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answered Jan 25, 2020 at 22:49

from functools import reduce

some_list = range(1, 8)

print(reduce(lambda x, y: x * y, some_list))

greybeard

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answered Dec 27, 2020 at 4:10

1

Try this:

user_number = int(input("Please enter a number: "))

number = 1

for i in range(1,user_number + 1):
    number = number * i

print(number)

answered Mar 20 at 17:10

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