How can I print my results in a text file?

Question

Well, I need to solve some linear systems through the Jacobi method using Python 3.8 programming, I made the code (which I’ll leave below), but I can’t make a print file that stores my results in an organized way. My goals are:

1. Create a folder and in it a file with the Jacobi function
2. From another file 'call' this function to solve all linear systems that will be there
3. Print these results in an organized way, like the figure below

---

import numpy as np
n = 3
A = np.array([(10.0, 3, -2), (2.0, 8, -1), (1.0, 1, 5)])
b = np.array([(57.0), (20.0), (-4.0)])
Toler = 1.0000e-05
IterMax = 50
x = np.zeros((n, 1))
v = np.zeros((n, 1))
Iter = 0
CondErro = 0
for i in range(n):
    r = (1/A[i, i])
    for j in range(n):
        if i != j:
            A[i, j] *= r
    b[i] *= r
    x[i] = b[i]
Iter = 0
while True:
    Iter += 1
    for i in range(n):
        soma = 0
        for j in range(n):
            if i != j:
                soma += A[i, j] * x[j]
        v[i] = b[i] - soma
    NormaNum = 0
    NormaDen = 0
    for i in range(n):
        t = abs(v[i]-x[i])
        if t > NormaNum:
            NormaNum = t
        if abs(v[i]) > NormaDen:
            NormaDen = abs(v[i])
        x[i] = v[i]
    NormaRel = (NormaNum / NormaDen)
    print(f'{Iter}{x}{NormaRel}')
    if NormaRel <= Toler or Iter >= IterMax:
        break
if NormaRel <= Toler:
    CondErro = 0
else:
    CondErro = 1

Answer 1

You can do the following:

buf = "" # cria um buffer para substituir o stdout

buf += "string" # fazer isso ao invés de print("string")

with open("filename", "w") as f:
    f.write(buf)

Or create another file and do this:

import subprocess
p = subprocess.run(["python3", "jacobi.py"], stdout=subprocess.PIPE)
with open("filename", "wb") as f:
    f.write(p.stdout)