Tweak format_size utility function to include a space (#7399)

Author: xavfernandez

src/pip/_internal/utils/misc.py

@@ -266,13 +266,13 @@ def ask_password(message):
 def format_size(bytes):
     # type: (float) -> str
     if bytes > 1000 * 1000:
-        return '%.1fMB' % (bytes / 1000.0 / 1000)
+        return '%.1f MB' % (bytes / 1000.0 / 1000)
     elif bytes > 10 * 1000:
-        return '%ikB' % (bytes / 1000)
+        return '%i kB' % (bytes / 1000)
     elif bytes > 1000:
-        return '%.1fkB' % (bytes / 1000.0)
+        return '%.1f kB' % (bytes / 1000.0)
     else:
-        return '%ibytes' % bytes
+        return '%i bytes' % bytes
 
 
 def is_installable_dir(path):

tests/unit/test_utils.py

@@ -995,10 +995,10 @@ def test_is_console_interactive(monkeypatch, isatty, no_stdin, expected):
 
 
 @pytest.mark.parametrize('size,expected', [
-    (123, "123bytes"),
-    (1234, "1.2kB"),
-    (123456, "123kB"),
-    (1234567890, "1234.6MB"),
+    (123, "123 bytes"),
+    (1234, "1.2 kB"),
+    (123456, "123 kB"),
+    (1234567890, "1234.6 MB"),
 ])
 def test_format_size(size, expected):
     assert format_size(size) == expected