test_sqrt.py

from math import sqrt

epsilon = 0.000000000001

def estimate(a):
    x = 0.5 * a
    while True:
        y = (x + a / x) / 2
        if abs(y - x) < epsilon:
            return y
        x = y
def test_square_root():
    """This only works when your IDLE window is a specific width, so you
    will have to fiddle around with that a little bit"""
    z = []
    for i in range(1,10):
        x = []
        for g in (float(i), sqrt(i), estimate(i), abs(sqrt(i) - estimate(i))):
            str_length = len(str(g)) # string length
            blanks = (30 - str_length) * " "; # blank space needed
            row_ = str(g) + blanks  # adding them together
            
            x.append(row_) # appending to the list
    
        z.append(x) # appending the 9 lists to a big list
    print(z)
    
test_square_root()