本文實例講述了python通過自定義isnumber函數判斷字符串是否為數字的方法。分享給大家供大家參考。具體如下:
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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 |
希望本文所述對大家的Python程序設計有所幫助。