How do I check if a string is a number (float) in Python?
http://stackoverflow.com/questions/354038/how-do-i-check-if-a-string-is-a-number-float-in-python
def is_number(s):
try:
float(s)
return True
except ValueError:
return False
原文：http://www.cnblogs.com/yaoshi/p/5224346.html