- Issue #8233: When run as a script, py_compile.py optionally takes a single

  argument `-` which tells it to read files to compile from stdin.  Each line
  is read on demand and the named file is compiled immediately.  (Original
  patch by Piotr Ożarowski).

Lib/py_compile.py

@@ -138,19 +138,35 @@ def main(args=None):
     not specified) are compiled and the resulting bytecode is cached
     in the normal manner.  This function does not search a directory
     structure to locate source files; it only compiles files named
-    explicitly.
+    explicitly.  If '-' is the only parameter in args, the list of
+    files is taken from standard input.
 
     """
     if args is None:
         args = sys.argv[1:]
     rv = 0
-    for filename in args:
-        try:
-            compile(filename, doraise=True)
-        except PyCompileError as err:
-            # return value to indicate at least one failure
-            rv = 1
-            sys.stderr.write(err.msg)
+    if args == ['-']:
+        while True:
+            filename = sys.stdin.readline()
+            if not filename:
+                break
+            filename = filename.rstrip('\n')
+            try:
+                compile(filename, doraise=True)
+            except PyCompileError as error:
+                rv = 1
+                sys.stderr.write("%s\n" % error.msg)
+            except IOError as error:
+                rv = 1
+                sys.stderr.write("%s\n" % error)
+    else:
+        for filename in args:
+            try:
+                compile(filename, doraise=True)
+            except PyCompileError as err:
+                # return value to indicate at least one failure
+                rv = 1
+                sys.stderr.write(error.msg)
     return rv
 
 if __name__ == "__main__":

Misc/NEWS

@@ -293,6 +293,11 @@ C-API
 Library
 -------
 
+- Issue #8233: When run as a script, py_compile.py optionally takes a single
+  argument `-` which tells it to read files to compile from stdin.  Each line
+  is read on demand and the named file is compiled immediately.  (Original
+  patch by Piotr Ożarowski).
+
 - Backwards incompatible change: Unicode codepoints line tabulation (0x0B) and
   form feed (0x0C) are now considered linebreaks, as specified in Unicode
   Standard Annex #14.  See issue #7643.