[edu] context manager (__enter__, __exit__, with as, 컨텍스트 매니저)
[file access] f = open('mytextfile.txt', 'w', encoding='utf8') for x in range(2, 10): for y in range(2, 10): f.write("{:02d} x {:02d} = {:02d}".format(x, y, x*y) + '\n') f.write("\n"*2) f.close() ..
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stackoverflow.com/questions/3774328/implementing-use-of-with-object-as-f-in-custom-class-in-python
Implementing use of 'with object() as f' in custom class in python
I have to open a file-like object in python (it's a serial connection through /dev/) and then close it. This is done several times in several methods of my class. How I WAS doing it was opening the...
stackoverflow.com
stackoverflow.com/questions/34749943/python-with-as-for-custom-context-manager
Python with...as for custom context manager
I wrote a simple context manager in Python for handling unit tests (and to try to learn context managers): class TestContext(object): test_count=1 def __init__(self): self.test_num...
stackoverflow.com
주의!! __enter__, __exit__ 만들어서 원하는 처리방식 추가하면 되나
__enter__ 에서 반드시 return self 가 되어야
with Custom_with_class() as cwc:
cwc.do_sth() # 이런식으로 접근이 가능함
Assuming that you need to access the context manager created in the with statement, __enter__needs to return self.
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