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Python String isnumeric()

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[开发(python) 所属分类 开发(python) | 发布者 店小二05 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

Python String isnumeric()
python String isnumeric() function returns True if all the characters in the string are numeric, otherwise False . If the string is empty, then this function returns False . Python String isnumeric()

Numeric characters include digit characters, and all characters that have the Unicode numeric value property. Formally, numeric characters are those with the property value Numeric_Type=Digit, Numeric_Type=Decimal or Numeric_Type=Numeric.

Let’s look at some examples of Python string isnumeric() function.

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s = '2019' print(s.isnumeric())

Output: True because all the characters in the string are numerical.

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s = 'Hello 2019' print(s.isnumeric())

Output: False because some of the characters in the string are not numerical.

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s = '' print(s.isnumeric())

Output: False because it’s an empty string.

Let’s look into some examples with special Unicode characters that are numerical.

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s = '' # 00bc: (VULGAR FRACTION ONE QUARTER) print(s) print(s.isnumeric()) s = '⒈⒗' #2488: ⒈ (DIGIT ONE FULL STOP), 2497: ⒗ (NUMBER SIXTEEN FULL STOP) print(s) print(s.isnumeric())

Output:

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True ⒈⒗ True

Print all Unicode Numeric Characters

We can use unicodedata module to print all the unicode characters that are considered as numeric.

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import unicodedata count = 0 for codepoint in range(2 ** 16): ch = chr(codepoint) if ch.isnumeric(): print(u'{:04x}: {} ({})'.format(codepoint, ch, unicodedata.name(ch, 'UNNAMED'))) count = count + 1 print(f'Total Number of Numeric Unicode Characters = {count}')

Output:

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0030: 0 (DIGIT ZERO) 0031: 1 (DIGIT ONE) ... ff16: 6 (FULLWIDTH DIGIT SIX) ff17: 7 (FULLWIDTH DIGIT SEVEN) ff18: 8 (FULLWIDTH DIGIT EIGHT) ff19: 9 (FULLWIDTH DIGIT NINE) Total Number of Numeric Unicode Characters = 800

I never thought that there will be 800 Unicode characters that are numeric.

If you are not familiar with f-prefixed string formatting, please readf-strings in Python.

You can checkout more Python examples from our GitHub Repository .

Reference: Official Documentation

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