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import pytest
class filelike():
def __init__(self):
self.written = ''
self.flushed = 0
def write(self, str):
self.written += str
def flush(self):
self.flushed += 1
def test_print_flush():
# operation of the flush flag
f = filelike()
print(1, file=f, end='', flush=True)
print(2, file=f, end='', flush=True)
print(3, file=f, flush=False)
assert f.written == '123\n'
assert f.flushed == 2
# ensure exceptions from flush are passed through
class noflush():
def write(self, str):
pass
def flush(self):
raise RuntimeError
with pytest.raises(RuntimeError):
print(1, file=noflush(), flush=True)
def test_end_None():
f = filelike()
print(1, file=f, end=None)
assert f.written == '1\n'
def test_sep_None():
f = filelike()
print(1, 2, 3, file=f, sep=None)
assert f.written == '1 2 3\n'
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