Update S3 create_bucket.py example to support regions

Merge pull request #738 from awsdocs/py_create_bucket

Author: SCalwas

python/example_code/s3/create_bucket.py

@@ -39,11 +39,12 @@ def create_bucket(bucket_name, region=None):
     """
 
     # Create bucket
-    s3_client = boto3.client('s3')
     try:
         if region is None:
+            s3_client = boto3.client('s3')
             s3_client.create_bucket(Bucket=bucket_name)
         else:
+            s3_client = boto3.client('s3', region_name=region)
             location = {'LocationConstraint': region}
             s3_client.create_bucket(Bucket=bucket_name,
                                     CreateBucketConfiguration=location)