How to multiply all integers inside list

Question

Hello so I want to multiply the integers inside a list   For example   l    1  2  3  l    1 2  2 2  3 2    output   l    2  4  6    So I was searching online and most of the answers were regarding multiply all the integers with each other such as    1 2 3

User · Answer

using numpy        In  1   import numpy as np      In  2   nums   np array  1 2 3   2      In  3   nums tolist       Out 4    2  4  6

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The simplest way to me is   map  2    mul     1  2  3

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Another functional approach which is maybe a little easier to look at than an anonymous function if you go that route is using functools partial to utilize the two-parameter operator mul with a fixed multiple   gt  gt  gt  from functools import partial  gt  gt  gt  from operator import mul  gt  gt  gt  double   partial mul  2   gt  gt  gt  list map double   1  2  3     2  4  6

User · Answer

Try a list comprehension   l    x   2 for x in l    This goes through l  multiplying each element by two   Of course  there s more than one way to do it  If you re into lambda functions and map  you can even do  l   map lambda x  x   2  l    to apply the function lambda x  x   2 to each element in l  This is equivalent to   def timesTwo x       return x   2  l   map timesTwo  l    Note that map   returns a map object  not a list  so if you really need a list afterwards you can use the list   function afterwards  for instance   l   list map timesTwo  l     Thanks to Minyc510 in the comments for this clarification

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multiplying each element in the list and adding it into an empty list original    1  2  3  results      for num in original      results append num 2   multiply each iterative number by 2 and add it to the empty list   print results

User · Answer

The most pythonic way would be to use a list comprehension   l    2 x for x in l    If you need to do this for a large number of integers  use numpy arrays   l   numpy array l  dtype int  2   A final alternative is to use map  l   list map lambda x 2 x  l

[python] How to multiply all integers inside list

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