force python to immediatly flush stdout and stderr streams so other programs such as nodejs can use immediately

src/__init__.py

@@ -0,0 +1,30 @@
+import sys
+
+# NOTE: this class is required to be able to use print/log commands and have them flush to stdout and stderr immediately
+# without wrapper stdout and stderr, when using `childProcess.stdout.on('data', ...)` in NodeJS script, we never get
+# any events fired until the process exists. However, force flushing the streams does first the callbacks in NodeJS.
+
+
+# this class forces stream writes to be flushed immediately
+class ImmediateFlushingStreamWrapper:
+
+    def __init__(self, stream):
+        self.stream = stream
+
+    # force write to flush immediately
+    def write(self, data):
+        self.stream.write(data)
+        self.stream.flush()
+
+    # force writelines to flush immediately
+    def writelines(self, lines):
+        self.stream.writelines(lines)
+        self.stream.flush()
+
+    def __getattr__(self, attr):
+        return getattr(self.stream, attr)
+
+
+# wrap stdout and stderr with our custom wrapper
+sys.stdout = ImmediateFlushingStreamWrapper(sys.stdout)
+sys.stderr = ImmediateFlushingStreamWrapper(sys.stderr)