diff --git a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/apis/reddit/RedditSearchSourceOpDesc.scala b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/apis/reddit/RedditSearchSourceOpDesc.scala
index 85cf30bf06b..078e55b2b2e 100644
--- a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/apis/reddit/RedditSearchSourceOpDesc.scala
+++ b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/apis/reddit/RedditSearchSourceOpDesc.scala
@@ -68,7 +68,7 @@ class RedditSearchSourceOpDesc extends PythonSourceOperatorDescriptor {
        |    client_secret = $clientSecretReal
        |    limit = $limit
        |    query = $queryReal
-       |    sorting = ${sorting.getName}
+       |    sorting = '${sorting.getName}'
        |
        |    @overrides
        |    def produce(self) -> Iterator[Union[TupleLike, TableLike, None]]:
diff --git a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/continuousErrorBands/ContinuousErrorBandsOpDesc.scala b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/continuousErrorBands/ContinuousErrorBandsOpDesc.scala
index b21c882ed35..a23d2f470fb 100644
--- a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/continuousErrorBands/ContinuousErrorBandsOpDesc.scala
+++ b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/continuousErrorBands/ContinuousErrorBandsOpDesc.scala
@@ -109,7 +109,7 @@ class ContinuousErrorBandsOpDesc extends PythonOperatorDescriptor {
         fig.add_trace(go.Scatter(
             x=table[${bandConf.xValue}],
             y=table[${bandConf.yValue}],
-            mode=${bandConf.mode.getModeInPlotly},
+            mode='${bandConf.mode.getModeInPlotly}',
             $colorPart
             $namePart
           ))"""
diff --git a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/contourPlot/ContourPlotOpDesc.scala b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/contourPlot/ContourPlotOpDesc.scala
index dd0f41b0faa..86fc20b9a2e 100644
--- a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/contourPlot/ContourPlotOpDesc.scala
+++ b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/contourPlot/ContourPlotOpDesc.scala
@@ -110,7 +110,7 @@ class ContourPlotOpDesc extends PythonOperatorDescriptor {
        |            y=np.linspace(min(y), max(y), grid_size),
        |            z=grid_z,
        |            connectgaps=connGaps,
-       |            contours_coloring =${coloringMethod.getColoringMethod},
+       |            contours_coloring ='${coloringMethod.getColoringMethod}',
        |            colorbar_title=$z
        |        ))
        |        fig.update_layout(title='Contour Plot')
diff --git a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/histogram2d/Histogram2DOpDesc.scala b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/histogram2d/Histogram2DOpDesc.scala
index 88167a8353f..c2e97e0a87c 100644
--- a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/histogram2d/Histogram2DOpDesc.scala
+++ b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/histogram2d/Histogram2DOpDesc.scala
@@ -81,7 +81,7 @@ class Histogram2DOpDesc extends PythonOperatorDescriptor {
     assert(yBins > 0, s"Y Bins must be > 0, but got $yBins")
 
     val normArg =
-      pyb"histnorm=${normalize.getValue},"
+      pyb"histnorm='${normalize.getValue}',"
 
     pyb"""
        |from pytexera import *