本文实例讲述了python通过自定义isnumber函数判断字符串是否为数字的方法。分享给大家供大家参考。具体如下:
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''' isnumeric.py test a numeric string s if it's usable for int(s) or float(s) ''' def isnumeric(s): '''returns True if string s is numeric''' return all (c in "0123456789.+-" for c in s) # test module ... if __name__ = = '__main__' : print (isnumeric( '123' )) # True print (isnumeric( '-123.45' )) # True print (isnumeric( '+3.14' )) # True print (isnumeric( '$99.95' )) # False |
希望本文所述对大家的Python程序设计有所帮助。