标签：提取 unknown val 字符 app string 取出 nbsp div
def eval(*args, **kwargs): # real signature unknown
"""
Evaluate the given source in the context of globals and locals.
The source may be a string representing a Python expression
or a code object as returned by compile().
The globals must be a dictionary and locals can be any mapping,
defaulting to the current globals and locals.
If only globals is given, locals defaults to it.
"""
用法一：将字符串中的数学表达式当成有效的表达式来求值并返回计算结果。
用法二：将字符串中的数据类型提取出来并返回此数据类型的数据 如将 ‘‘[1, 2, 2]‘‘转换成[1, 2, 3]
print(eval(‘1+2+3‘)) print(type(eval(‘[1, 2, 3]‘))) # 结果 6 # 结果 <class ‘list‘>
标签：提取 unknown val 字符 app string 取出 nbsp div
原文地址：http://www.cnblogs.com/lcgsmile/p/6133538.html
