fix lint errors

Author: JacksonTian

Makefile

@@ -2,8 +2,8 @@
 test-all: lint test functional-test coverage-report
 
 lint:
-pycodestyle --statistics aliyun-python-sdk-core/ --max-line-length=100 --ignore=W391,E121,E123,E126,E226,E24,E704,W503,W504 --exclude=DescribeEndpointsRequest.py,vendored
-pycodestyle --statistics python-sdk-functional-test/ --max-line-length=100 --ignore=W391,E121,E123,E126,E226,E24,E704,W503,W504
+pycodestyle --statistics aliyun-python-sdk-core/ --max-line-length=120 --ignore=W391,E121,E123,E126,E226,E24,E704,W503,W504 --exclude=DescribeEndpointsRequest.py,vendored
+pycodestyle --statistics python-sdk-functional-test/ --max-line-length=120 --ignore=W391,E121,E123,E126,E226,E24,E704,W503,W504
 
 test:
 coverage run --branch --source="./aliyun-python-sdk-core/aliyunsdkcore" -m pytest aliyun-python-sdk-core/tests/

aliyun-python-sdk-core/tests/auth/test_credentials.py

@@ -2,7 +2,7 @@
 
 from tests import unittest
 
-from aliyunsdkcore.auth.credentials import AccessKeyCredential, StsTokenCredential,\
+from aliyunsdkcore.auth.credentials import AccessKeyCredential, StsTokenCredential, \
  RamRoleArnCredential
 from aliyunsdkcore.auth.credentials import EcsRamRoleCredential, RsaKeyPairCredential