PY-21515 Always put a single space after "from" keyword

python/src/com/jetbrains/python/formatter/PythonFormattingModelBuilder.java

@@ -121,7 +121,7 @@ public class PythonFormattingModelBuilder implements FormattingModelBuilderEx, C
       .beforeInside(RPAR, FROM_IMPORT_STATEMENT).spaces(0, pySettings.FROM_IMPORT_NEW_LINE_BEFORE_RIGHT_PARENTHESIS)
       .after(COMMA).spaceIf(commonSettings.SPACE_AFTER_COMMA)
       .before(COMMA).spaceIf(commonSettings.SPACE_BEFORE_COMMA)
-      .between(FROM_KEYWORD, DOT).spaces(1)
+      .after(FROM_KEYWORD).spaces(1)
       .between(DOT, IMPORT_KEYWORD).spaces(1)
       .around(DOT).spaces(0)
       .aroundInside(AT, DECORATOR_CALL).none()

python/testData/formatter/spacesAfterFromInYieldFrom.py

@@ -0,0 +1,6 @@
+def g():
+    yield 42
+
+
+def f():
+    yield from   g()

python/testData/formatter/spacesAfterFromInYieldFrom_after.py

@@ -0,0 +1,6 @@
+def g():
+    yield 42
+
+
+def f():
+    yield from g()

python/testData/formatter/spacesBeforeFromImportSource.py

@@ -0,0 +1,3 @@
+from   sys   import   path
+
+print(sys.path)

python/testData/formatter/spacesBeforeFromImportSource_after.py

@@ -0,0 +1,3 @@
+from sys import path
+
+print(sys.path)

python/testSrc/com/jetbrains/python/PyFormatterTest.java

@@ -809,6 +809,15 @@ public class PyFormatterTest extends PyTestCase {
     runWithLanguageLevel(LanguageLevel.PYTHON30, this::doTest);
   }
 
+  // PY-21515
+  public void testSpacesBeforeFromImportSource() {
+    doTest();
+  }
+
+  public void testSpacesAfterFromInYieldFrom() {
+    runWithLanguageLevel(LanguageLevel.PYTHON33, this::doTest);
+  }
+
   public void testVariableAnnotations() {
     runWithLanguageLevel(LanguageLevel.PYTHON36, this::doTest);
   }