fix python isprime

isprime-python/Dockerfile

@@ -5,11 +5,11 @@ FROM python:3.7-slim
 # Copy local code to the container image.
 ENV APP_HOME /app
 WORKDIR $APP_HOME
-COPY . ./
 
 # Install production dependencies.
-RUN pip install Flask gunicorn
+RUN pip install --no-cache-dir Flask gunicorn
 
+COPY . ./
 # Run the web service on container startup. Here we use the gunicorn
 # webserver, with one worker process and 8 threads.
 # For environments with multiple CPU cores, increase the number of workers