weird compilation behavior

new to pycharm and python in general.

i wrote code with multiple modules, tried to debug it with some print commands and became more confused in the process.

main module called test.py:

import torchvision
import torch.nn as nn
import torch.nn.functional as F
import torch.optim as optim
import torch
from Net import Net
from data_load import classes, trainloader, testloader
from helper_func import matplotlib_imshow
print('writer not')
from board import writer

if __name__ == "__main__":
    # default `log_dir` is "runs" - we'll be more specific here
    # get some random training images
    dataiter = iter(trainloader)
    images, labels = dataiter.next()
    print(images.shape)
    # create grid of images
    img_grid = torchvision.utils.make_grid(images)

    # show images
    matplotlib_imshow(img_grid, one_channel=True)

    # write to tensorboard
    writer.add_image('four_fashion_mnist_images', img_grid)
    print('writer yes')

module 2 board.py:
from torch.utils.tensorboard import SummaryWriter
#from tensorboardX import SummaryWriter
writer = SummaryWriter('runs/fashion_mnist_experiment_1')
print('writer ready')

the rest of the modules are less important.
i don't understand why the command 
```
from board import writer
```

executes the entire module (including print commnad)?


more critically,  when i run the script (by pressing shift + f10 in test.py module, i get the following print out:
writer not
writer ready
writer not
writer not
writer ready
writer ready
torch.Size([4, 1, 28, 28])
writer yes


why does the writer not, writer ready repeat after the first time. and why does it double repeat the second time?

i was expecting :
writer not
writer ready
torch.Size([4, 1, 28, 28])
writer yes

please help!