Context manager inside try/except reports incomplete coverage with --branch

[nedbat]

Originally reported by lucasboppre (Bitbucket: lucasboppre, GitHub: Unknown)

---

It looks to me as if all branches have been taken, but coverage disagrees. Problem disappears with context manager is removed or value is returned directly.

#!python

def soft_read(filename):
    try:
        with open(filename, 'r') as f:
            value = f.read()   # line 4, partial coverage
    except:
        value = ''
    return value

assert soft_read('missing file.txt') == ''
assert len(soft_read(__file__))

Line 4 was executed, but never jumped to line 5

---

• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/470

[nedbat]

Duplicate of #146.

[nedbat]

This is now fixed in beta, try it: https://pypi.python.org/pypi/coverage/4.1b2

[nedbat]

Original comment by lucasboppre (Bitbucket: lucasboppre, GitHub: Unknown)

---

Thanks! I checked all open issues for duplicates, and searched the closed ones, but couldn't find because I thought it had something to do with the try/except. Upgrading to beta fixed the problem (pip install --pre --upgrade coverage).