linfo2335-programming-paradigms/project-3/regex/code/code358.py

def approx_pi(i):        
    if i == 0:
        print(4)
        return 4
        print(4)
    pi = 0
    for j in range(i+1) :
        pi += (((-1)**j) / ((2*j)+1))
    return(4*pi)