Why doesn't if see the word?

Question

Python

with Popen([sys.executable, '-u', 'executer/__main__.py', f'{address} {filename}'],
               stdout=PIPE, universal_newlines=True) as process:
        for line in process.stdout:
            print(line)
            if line == 'stock':
                return

print displays stock, but the check itself does not see it, I tried find, but also without result.
isinstance says it's a string, what's the problem then?

Answer 1

Most likely at the end of the line "stuck" the transfer of the correction. A simple solution might be str.rstrip():

# if line == 'stock': # Убрать
if line.rstrip() == 'stock': # Добавить

In general, use the pycharm debugger or another similar one and everything will fall into place, do not guess using print.
If there are problems using the debugger, try using this print. It will show labels along the boundaries of the word and it will be clear what is wrong in it.

# print(line)  # убрать
print(">%s<" % line) # добавить