From 36af6f66de4722b30f5e8a960e5791f3a8ad2a16 Mon Sep 17 00:00:00 2001
From: Devesh Kumar Singh <deveshkusingh@gmail.com>
Date: Tue, 26 May 2020 13:39:24 +0530
Subject: [PATCH] Assert proc.stdin and proc.stdout

---
 src/pip/_internal/utils/subprocess.py | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/pip/_internal/utils/subprocess.py b/src/pip/_internal/utils/subprocess.py
index bdebaef7827..d93801b2ac4 100644
--- a/src/pip/_internal/utils/subprocess.py
+++ b/src/pip/_internal/utils/subprocess.py
@@ -185,8 +185,9 @@ def call_subprocess(
             stderr=subprocess.STDOUT, stdin=subprocess.PIPE,
             stdout=subprocess.PIPE, cwd=cwd, env=env,
         )
-        if proc.stdin:
-            proc.stdin.close()
+        assert proc.stdin
+        assert proc.stdout
+        proc.stdin.close()
     except Exception as exc:
         if log_failed_cmd:
             subprocess_logger.critical(
@@ -196,9 +197,7 @@ def call_subprocess(
     all_output = []
     while True:
         # The "line" value is a unicode string in Python 2.
-        line = None
-        if proc.stdout:
-            line = console_to_str(proc.stdout.readline())
+        line = console_to_str(proc.stdout.readline())
         if not line:
             break
         line = line.rstrip()