字典提取元素体验：提取1个元素，提取多个元素相加，提取多个元素，提取错误。

提取1个元素

scores = {'小明':95,'小红':90,'小刚':90}
print(scores['小红'])
# 90

提取多个元素

scores = {'小明':95,'小红':90,'小刚':90}
print(scores['小红'],scores['小明'])
# 90 95

提取多个元素相加

scores = {'小明':95,'小红':90,'小刚':90}
print(scores['小红']+scores['小明'])
# 185

提取元素语法错误。

scores = {'小明':95,'小红':90,'小刚':90}
print(scores['小红'],['小明'])
# 90,['小明']