Merge pull request xianhu#4 from KrisYu/master

missing quote ‘ typo

Author: xianhu

python_base.py

@@ -191,7 +191,7 @@
  # 普通调用
  "{0}, {1} and {2}".format('spam', 'ham', 'eggs') # 基于位置的调用
  "{motto} and {pork}".format(motto = 'spam', pork = 'ham') # 基于Key的调用
- "{motto} and {0}".format(ham, motto = 'spam') # 混合调用
+ "{motto} and {0}".format('ham', motto = 'spam') # 混合调用
  # 添加键 属性 偏移量 (import sys)
  "my {1[spam]} runs {0.platform}".format(sys, {'spam':'laptop'}) # 基于位置的键和属性
  "{config[spam]} {sys.platform}".format(sys = sys, config = {'spam':'laptop'}) # 基于Key的键和属性