itertools.accumulate

Describing itertools.accumulate(iterable, agg)

• accumulate performs a rolling aggregation of an iterable
• This iterable is based on the iterable parameter
• This aggregation is determined by the agg parameter
• accumulate returns an iterator of accumulated elements
• The agg accepts functions from the operator module

• Some examples of acceptable operators are:

  • operator. mul
  • operator.truediv
  • operator.add
  • min
  • max

Illustrating the accumulate Function

>>> from itertools import accumulate
>>> import operator
>>> nums = [4, 1, 3, 2, 5]

>>> itr = accumulate(nums, operator.mul)
>>> for i in itr: print(i)
4
4
12
24
120

>>> itr = accumulate(nums, min)
>>> for i in itr: print(i)
4
1
1
1
1

References

• Documentation of the Accumulate Function from Itertools
• Potential Operators for Accumulation