打印unicode字符名称-例如'GREEKSMALLLETTERALPHA'-而不是'?'
我正在测试功能isprintable()。我想打印 string 中所有字符的 Unicode NAMES string.whitespace + unicodedata.lookup("GREEK SMALL LETTER ALPHA")。
如何打印所有名称 - 例如“SPACE”、“NO-BREAK SPACE”、“HORIZONTAL TAB”、“GREEK SMALL LETTER ALPHA”。
import unicodedata, string
for e in string.whitespace + unicodedata.lookup("GREEK SMALL LETTER ALPHA"):
print(ord(e))
print(unicodedata.name(e))
我收到错误“ValueError:没有这样的名字”
32
SPACE
9
Traceback (most recent call last):
File "<stdin>", line 3, in <module>
ValueError: no such name
回答
正如注释所示,Unicode 数据库没有为每个字符命名,但NameAliases.txt有。下面解析该文件并返回一个别名(如果存在)。在这种情况下,在文件中找到的第一个:
import string
import requests
import unicodedata as ud
# Pull the official NameAliases.txt from the matching Unicode database
# the current Python was built with.
response = requests.get(f'http://www.unicode.org/Public/{ud.unidata_version}/ucd/NameAliases.txt')
# Parse NameAliases.txt, storing the first instance of a code and a name
aliases = {}
for line in response.text.splitlines():
if not line.strip() or line.startswith('#'):
continue
code,name,_ = line.split(';')
val = chr(int(code,16))
if val not in aliases:
aliases[val] = name
# Return the first alias from NameAliases.txt if it exists when unicodedata.name() fails.
def name(c):
try:
return ud.name(c)
except ValueError:
return aliases.get(c,'<no name>')
for e in string.whitespace + ud.lookup("GREEK SMALL LETTER ALPHA"):
print(f'U+{ord(e):04X} {name(e)}')
输出:
U+0020 SPACE
U+0009 CHARACTER TABULATION
U+000A LINE FEED
U+000D CARRIAGE RETURN
U+000B LINE TABULATION
U+000C FORM FEED
U+03B1 GREEK SMALL LETTER ALPHA
THE END
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