我有一个二进制文件，我想提取所有ascii字符，而忽略非ascii字符。目前我有：
with open(filename, 'rb') as fobj:
text = fobj.read().decode('utf-16-le')
file = open("text.txt", "w")
file.write("{}".format(text))
file.close
但是，写入文件时遇到错误UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 0: ordinal not in range(128)。我将如何让Python忽略非ascii？
使用内置的ASCII编解码器，并告诉它忽略任何错误，例如：
with open(filename, 'rb') as fobj:
text = fobj.read().decode('utf-16-le')
file = open("text.txt", "w")
file.write("{}".format(text.encode('ascii', 'ignore')))
file.close()
您可以在Python解释器中对此进行测试和试玩：
>>> s = u'hello \u00a0 there'
>>> s
u'hello \xa0 there'
仅尝试转换为字符串会引发异常。
>>> str(s)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 6: ordinal not in range(128)
...就像尝试将unicode字符串编码为ASCII一样：
>>> s.encode('ascii')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 6: ordinal not in range(128)
...但是告诉编解码器忽略它无法处理的字符可以：
>>> s.encode('ascii', 'ignore')
'hello there'
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