diff --git a/moto/awslambda/models.py b/moto/awslambda/models.py
index 00205df3e..a58582599 100644
--- a/moto/awslambda/models.py
+++ b/moto/awslambda/models.py
@@ -825,7 +825,9 @@ class LambdaBackend(BaseBackend):
         return self._lambdas.publish_function(function_name)
 
     def get_function(self, function_name_or_arn, qualifier=None):
-        return self._lambdas.get_function_by_name_or_arn(function_name_or_arn, qualifier)
+        return self._lambdas.get_function_by_name_or_arn(
+            function_name_or_arn, qualifier
+        )
 
     def list_versions_by_function(self, function_name):
         return self._lambdas.list_versions_by_function(function_name)
diff --git a/tests/test_awslambda/test_lambda.py b/tests/test_awslambda/test_lambda.py
index c1aff468d..306deeea4 100644
--- a/tests/test_awslambda/test_lambda.py
+++ b/tests/test_awslambda/test_lambda.py
@@ -388,7 +388,7 @@ def test_get_function():
         Timeout=3,
         MemorySize=128,
         Publish=True,
-        Environment={"Variables": {"test_variable": "test_value"}}
+        Environment={"Variables": {"test_variable": "test_value"}},
     )
 
     result = conn.get_function(FunctionName="testFunction")
@@ -417,9 +417,11 @@ def test_get_function():
     result["Configuration"]["Timeout"].should.equal(3)
     result["Configuration"]["Version"].should.equal("$LATEST")
     result["Configuration"].should.contain("VpcConfig")
-    result['Configuration'].should.contain('Environment')
-    result['Configuration']['Environment'].should.contain('Variables')
-    result['Configuration']['Environment']["Variables"].should.equal({"test_variable": "test_value"})
+    result["Configuration"].should.contain("Environment")
+    result["Configuration"]["Environment"].should.contain("Variables")
+    result["Configuration"]["Environment"]["Variables"].should.equal(
+        {"test_variable": "test_value"}
+    )
 
     # Test get function with
     result = conn.get_function(FunctionName="testFunction", Qualifier="$LATEST")
@@ -432,26 +434,32 @@ def test_get_function():
     with assert_raises(ClientError):
         conn.get_function(FunctionName="junk", Qualifier="$LATEST")
 
+
 @mock_lambda
 @mock_s3
 def test_get_function_by_arn():
-    bucket_name = 'test-bucket'
-    s3_conn = boto3.client('s3', 'us-east-1')
+    bucket_name = "test-bucket"
+    s3_conn = boto3.client("s3", "us-east-1")
     s3_conn.create_bucket(Bucket=bucket_name)
 
     zip_content = get_test_zip_file2()
-    s3_conn.put_object(Bucket=bucket_name, Key='test.zip', Body=zip_content)
-    conn = boto3.client('lambda', 'us-east-1')
+    s3_conn.put_object(Bucket=bucket_name, Key="test.zip", Body=zip_content)
+    conn = boto3.client("lambda", "us-east-1")
 
-    fnc = conn.create_function(FunctionName='testFunction',
-                               Runtime='python2.7', Role='test-iam-role',
-                               Handler='lambda_function.lambda_handler',
-                               Code={'S3Bucket': bucket_name, 'S3Key': 'test.zip'},
-                               Description='test lambda function',
-                               Timeout=3, MemorySize=128, Publish=True)
+    fnc = conn.create_function(
+        FunctionName="testFunction",
+        Runtime="python2.7",
+        Role="test-iam-role",
+        Handler="lambda_function.lambda_handler",
+        Code={"S3Bucket": bucket_name, "S3Key": "test.zip"},
+        Description="test lambda function",
+        Timeout=3,
+        MemorySize=128,
+        Publish=True,
+    )
 
-    result = conn.get_function(FunctionName=fnc['FunctionArn'])
-    result['Configuration']['FunctionName'].should.equal('testFunction')
+    result = conn.get_function(FunctionName=fnc["FunctionArn"])
+    result["Configuration"]["FunctionName"].should.equal("testFunction")
 
 
 @mock_lambda
@@ -1347,7 +1355,7 @@ def test_update_configuration():
         Timeout=3,
         MemorySize=128,
         Publish=True,
-        Environment={'Variables': {"test_old_environment": "test_old_value"}}
+        Environment={"Variables": {"test_old_environment": "test_old_value"}},
     )
 
     assert fxn["Description"] == "test lambda function"
@@ -1362,7 +1370,7 @@ def test_update_configuration():
         Handler="lambda_function.new_lambda_handler",
         Runtime="python3.6",
         Timeout=7,
-        Environment={"Variables": {"test_environment": "test_value"}}
+        Environment={"Variables": {"test_environment": "test_value"}},
     )
 
     assert updated_config["ResponseMetadata"]["HTTPStatusCode"] == 200
@@ -1371,7 +1379,9 @@ def test_update_configuration():
     assert updated_config["MemorySize"] == 128
     assert updated_config["Runtime"] == "python3.6"
     assert updated_config["Timeout"] == 7
-    assert updated_config["Environment"]["Variables"] == {"test_environment": "test_value"}
+    assert updated_config["Environment"]["Variables"] == {
+        "test_environment": "test_value"
+    }
 
 
 @mock_lambda