@author jackzhenguo
@desc
@date 2019/2/15将一个整数或数值型字符串转换为浮点数
In [1]: float(3)
Out[1]: 3.0如果不能转化为浮点数，则会报ValueError:
In [2]: float('a')
# ValueError: could not convert string to float: 'a'Expand file tree
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