[Python] Indentation error encountered when running python in VS Code

import numpy as np
from doubleml.datasets import make_plr_CCDDHNR2018

np.random.seed(1234)
n_rep = 1000
n_obs = 500
n_vars = 20
alpha = 0.5

data = list()

for i_rep in range(n_rep):
(x, y, d) = make_plr_CCDDHNR2018(alpha=alpha, n_obs=n_obs, dim_x=n_vars, return_type='array')
data.append((x, y, d))


After running the preceding codes, I get the following error:

File "<python-input-7>", line 3

data. append((x, y, d))

IndentationError: unexpected indent
​

This shouldn't have happened as data.append((x, y, d)) was part of the for loop. I've tried it in my RStudio, which also enables people to run Python files, and it works perfectly. Can someone please explain what the issue could be?

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