file.write not working properly

[newbieAuggie2019]

I see something! At the end of the script you forgot to close the file. Use fhand.close() instead of fhand.close. It may perhaps change something.

Hi!

I was running the program and having the same result as mnh001, and when I changed the code as you suggested, the last lines of the txt file are then:

Output:
3864, [-1575, -1296, 2880, 3600, -1215, -405, 189, 1026, -999, 0]
3865, [-1584, 0]
3866, [-1495, 1235, -429, 585, 162, 189, 1026, -999, 0]
3867, [-1440, 225, 81, 63, 27, -45, -9]
3868, [-1575, -1296, 2880, 3600, -1215, -405, 189, 1026, -999, 0]
3869, [-2080, 3600, -1215, -405, 189, 1026, -999, 0]

Ah, that did it. I totally forgot the parenthesis. Thanks.

I was having the same result as you on the txt file, but to have the same results in both the txt file and on screen, I had to do the change suggested by Gribouillis, but I also had to interchange the order of lines 44 and 45 (I don't know why or how, though):

import numpy as np
 
#
 
def mat(num_in, side):
    rows = []
    A = []
        
    for y in range(0, side):
        for x in range(0, side):
            rows.append(int(num_in[x]))
        A.append(rows)
        rows = []
        rgt = num_in[side - 1:]
        temp = rgt
        for z in range(0, side - 1):
            temp = temp + num_in[z]
        num_in = str(temp)
    return A
 
 
side = 4; side1 = side
num_in = str(10**(side1 - 1))
hold = int(num_in)
 
fhand = open("cd4.txt", "w")
 
s = 0
chain = []
while int(hold) < 10**side1:
    while s == 0:
        A = mat(num_in, side)
        det = int(round(np.linalg.det(A)))
        if (det in chain or abs(det) in chain) or (det < 10 and det > -10):
            chain.append(det)
            break
        else:
            chain.append(det)
            num_in = str(abs(det))
            side = len(num_in)
    hold += 1
    num_in = str(hold)
    side = len(num_in)
    print(f'{hold - 1}, {chain}')
    fhand.write(f'{hold - 1}, {chain}\n')
    chain = []
 
fhand.close()

With that last modification both the text file and the output on the screen are the same.

All the best,