我会用..

try:
    float(element)
except ValueError:
    print "Not a float"

..很简单，而且很有效.请注意，如果元素是例如，它仍然会抛出 OverflowError1

..it's simple, and it works. Note that it will still throw OverflowError if element is e.g. 1<<1024.

另一个选项是正则表达式:

Another option would be a regular expression:

import re
if re.match(r'^-?\d+(?:\.\d+)$', element) is None:
    print "Not float"