Context Manager (with)

[wyattbiker]

So a Context Manager with statement class must have __enter__() and __exit__() .

For example file objects with will automatically close the file.

with open("/Users/user/tmp/workData.txt", "w") as work_data:
    for value in h:
        str_value = str(value)
        work_data.write(str_value)
        work_data.write("\n")

#1) How does one know if a class object supports the Context Manager. What should I be looking for in the docs?

#2) How do you overwrite it (as in file objects for example?)

Thanks