DigitQ
 Usage
• DigitQ[string]用来判断该字符串中的所有字符是否是0到9的数字,若是则返回 True，否则返回False.
Notes
 Further Examples
Since each of the characters in this string are digits, a value of True is returned
In[1]:=
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Out[1]=
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This string contains a character that is not a digit.
In[2]:=
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Out[2]=
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