bpo-25452: Add __bool__() method to subprocess.CompletedProcess.

Doc/library/subprocess.rst

@@ -133,6 +133,12 @@ compatibility with older versions, see the :ref:`call-function-trio` section.
 
    .. versionadded:: 3.5
 
+   .. method:: __bool__()
+
+      Returns True if :attr:`returncode` is zero, otherwise False.
+
+   .. versionadded:: 3.7
+
 .. data:: DEVNULL
 
    Special value that can be used as the *stdin*, *stdout* or *stderr* argument

Lib/subprocess.py

@@ -355,6 +355,10 @@ def __init__(self, args, returncode, stdout=None, stderr=None):
         self.stdout = stdout
         self.stderr = stderr
 
+    def __bool__(self):
+        """ Returns True if the exit code is zero; otherwise False."""
+        return self.returncode == 0
+
     def __repr__(self):
         args = ['args={!r}'.format(self.args),
                 'returncode={!r}'.format(self.returncode)]

Misc/NEWS

@@ -249,6 +249,9 @@ Extension Modules
 Library
 -------
 
+- bpo-25452: Add __bool__() method to subprocess.CompletedProcess. Patch by
+  Sayan Chowdhury
+
 - Issue #16285: urrlib.parse.quote is now based on RFC 3986 and hence includes
   '~' in the set of characters that is not quoted by default. Patch by
   Christian Theune and Ratnadeep Debnath.