Allow bytecode again (#9502)

In #75, bytecode was disabled (from a bit of FUD back in `python<2.4` days, according to dev chat), I think it's safe enough to enable it again.

Added in `__pycache__/` and `.pyc`/`.pyd` to `.gitignore`, to extra-insure compiled files don't get committed.

`Signed-off-by: Jonathan de Jong <jonathan@automatia.nl>`

8 files changed, 16 insertions, 10 deletions

diff --git a/.gitignore b/.gitignore
index 2cef1b0a5a..295a18b539 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,13 +6,14 @@
 *.egg
 *.egg-info
 *.lock
-*.pyc
+*.py[cod]
 *.snap
 *.tac
 _trial_temp/
 _trial_temp*/
 /out
 .DS_Store
+__pycache__/
 
 # stuff that is likely to exist when you run a server locally
 /*.db
diff --git a/changelog.d/9502.misc b/changelog.d/9502.misc
new file mode 100644
index 0000000000..c5c29672b6
--- /dev/null
+++ b/changelog.d/9502.misc
@@ -0,0 +1 @@
+Allow python to generate bytecode for synapse.
\ No newline at end of file
diff --git a/debian/build_virtualenv b/debian/build_virtualenv
index cf19084a9f..cad7d16883 100755
--- a/debian/build_virtualenv
+++ b/debian/build_virtualenv
@@ -58,10 +58,10 @@ trap "rm -r $tmpdir" EXIT
 cp -r tests "$tmpdir"
 
 PYTHONPATH="$tmpdir" \
-    "${TARGET_PYTHON}" -B -m twisted.trial --reporter=text -j2 tests
+    "${TARGET_PYTHON}" -m twisted.trial --reporter=text -j2 tests
 
 # build the config file
-"${TARGET_PYTHON}" -B "${VIRTUALENV_DIR}/bin/generate_config" \
+"${TARGET_PYTHON}" "${VIRTUALENV_DIR}/bin/generate_config" \
         --config-dir="/etc/matrix-synapse" \
         --data-dir="/var/lib/matrix-synapse" |
     perl -pe '
@@ -87,7 +87,7 @@ PYTHONPATH="$tmpdir" \
 ' > "${PACKAGE_BUILD_DIR}/etc/matrix-synapse/homeserver.yaml"
 
 # build the log config file
-"${TARGET_PYTHON}" -B "${VIRTUALENV_DIR}/bin/generate_log_config" \
+"${TARGET_PYTHON}" "${VIRTUALENV_DIR}/bin/generate_log_config" \
         --output-file="${PACKAGE_BUILD_DIR}/etc/matrix-synapse/log.yaml"
 
 # add a dependency on the right version of python to substvars.
diff --git a/debian/changelog b/debian/changelog
index 642e4d381d..04cd0d0d68 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+matrix-synapse-py3 (1.29.0) UNRELEASED; urgency=medium
+
+  [ Jonathan de Jong ]
+  * Remove the python -B flag (don't generate bytecode) in scripts and documentation.
+
+ -- Synapse Packaging team <packages@matrix.org>  Fri, 26 Feb 2021 14:41:31 +0100
+
 matrix-synapse-py3 (1.28.0) stable; urgency=medium
 
   * New synapse release 1.28.0.
diff --git a/debian/synctl.1 b/debian/synctl.1
index 437f8f9e0e..af58c8d224 100644
--- a/debian/synctl.1
+++ b/debian/synctl.1
@@ -44,7 +44,7 @@ Configuration file may be generated as follows:
 .
 .nf
 
-$ python \-B \-m synapse\.app\.homeserver \-c config\.yaml \-\-generate\-config \-\-server\-name=<server name>
+$ python \-m synapse\.app\.homeserver \-c config\.yaml \-\-generate\-config \-\-server\-name=<server name>
 .
 .fi
 .
diff --git a/debian/synctl.ronn b/debian/synctl.ronn
index 1bad6094f3..10cbda988f 100644
--- a/debian/synctl.ronn
+++ b/debian/synctl.ronn
@@ -41,7 +41,7 @@ process.
 
 Configuration file may be generated as follows:
 
-    $ python -B -m synapse.app.homeserver -c config.yaml --generate-config --server-name=<server name>
+    $ python -m synapse.app.homeserver -c config.yaml --generate-config --server-name=<server name>
 
 ## ENVIRONMENT
 
diff --git a/synapse/app/__init__.py b/synapse/app/__init__.py
index a01bac2997..4a9b0129c3 100644
--- a/synapse/app/__init__.py
+++ b/synapse/app/__init__.py
@@ -17,8 +17,6 @@ import sys
 
 from synapse import python_dependencies  # noqa: E402
 
-sys.dont_write_bytecode = True
-
 logger = logging.getLogger(__name__)
 
 try:
diff --git a/synctl b/synctl
index cfa9cec0c4..56c0e3940f 100755
--- a/synctl
+++ b/synctl
@@ -30,7 +30,7 @@ import yaml
 
 from synapse.config import find_config_files
 
-SYNAPSE = [sys.executable, "-B", "-m", "synapse.app.homeserver"]
+SYNAPSE = [sys.executable, "-m", "synapse.app.homeserver"]
 
 GREEN = "\x1b[1;32m"
 YELLOW = "\x1b[1;33m"
@@ -117,7 +117,6 @@ def start_worker(app: str, configfile: str, worker_configfile: str) -> bool:
 
     args = [
         sys.executable,
-        "-B",
         "-m",
         app,
         "-c",