Slow pi approximation X27663

Statement

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Write a function slow_pi_approx(n) that given a non negative integer n computes 4∑_{k = 0}ⁿ (−1)^k/2k + 1 The returned value has to be rounded to the ten thousandth by using the python function round(_,4).

Sample session

>>> slow_pi_approx(10)
3.2323
>>> slow_pi_approx(100)
3.1515
>>> slow_pi_approx(1000)
3.1426

Information

Author: ProAl
Language: English
Official solutions: Python
User solutions: Python