python - 如何修复 - 错误 : bad escape\u at position 0

Question

您好，我正在尝试在 jupyter notebook 中使用 ipywidgets 导出 gmap html，但遇到以下错误:- 错误:错误转义\u 在位置 0。

我是编程新手，可以使用帮助修复导致此错误发生的任何问题。如果有任何更简单的方法来导出 html 文件，我很乐意改变方法。

谢谢

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这是代码片段:如果有帮助，我可以添加整个代码。

import pandas as pd
import gmaps
from ipywidgets.embed import embed_minimal_html
from ipywidgets import IntSlider
gmaps.configure(api_key='XXXX')
pd.options.mode.chained_assignment = None  # default='warn'


file2 = '005 lat:long.csv'
state2 = pd.read_csv(file2)
state2 = state2.rename(columns={'Address1': 'address', 'City':'city', 
                                'State':'state', 'Zip': 'zip'})

storenumbs = state2['Store'].str.split('#', expand=True)
state2 = state2.join(storenumbs)
state2 = state2.drop(['Store', 0], axis=1)
state2 = state2.rename(columns={1: 'store_#'})
state2['store_#'] = state2['store_#'].astype(int)

fig = gmaps.figure(center=(42.5, -71.4), map_type='TERRAIN', zoom_level=9.8)
scale = 4
one_layer = (gmaps.symbol_layer(low_points_lat_long, fill_color='red', stroke_color='red', scale= scale))
two_layer = (gmaps.symbol_layer(low_med_points_lat_long, fill_color='red', stroke_color='yellow', scale= scale))
three_layer = (gmaps.symbol_layer(med_high_points_lat_long, fill_color='yellow', stroke_color='green', scale= scale))
four_layer = (gmaps.symbol_layer(high_points_lat_long, fill_color='green', stroke_color='green', scale= scale))


fig.add_layer(one_layer)
fig.add_layer(two_layer)
fig.add_layer(three_layer)
fig.add_layer(four_layer)

fig
embed_minimal_html('export.html', views=[fig]

长格式错误波纹管

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)

KeyError                                  Traceback (most recent call last)
~/miniconda3/lib/python3.7/sre_parse.py in parse_template(source, pattern)
   1020                 try:
-> 1021                     this = chr(ESCAPES[this][1])
   1022                 except KeyError:

KeyError: '\\u'

During handling of the above exception, another exception occurred:

error                                     Traceback (most recent call last)
<ipython-input-7-c096ac365396> in <module>
     20 
     21 slider = IntSlider(value=40)
---> 22 embed_minimal_html('export.html', views=[slider], title='Widgets export')

~/miniconda3/lib/python3.7/site-packages/ipywidgets/embed.py in embed_minimal_html(fp, views, title, template, **kwargs)
    300     {embed_kwargs}
    301     """
--> 302     snippet = embed_snippet(views, **kwargs)
    303 
    304     values = {

~/miniconda3/lib/python3.7/site-packages/ipywidgets/embed.py in embed_snippet(views, drop_defaults, state, indent, embed_url, requirejs, cors)
    266     widget_views = u'\n'.join(
    267         widget_view_template.format(view_spec=escape_script(json.dumps(view_spec)))
--> 268         for view_spec in data['view_specs']
    269     )
    270 

~/miniconda3/lib/python3.7/site-packages/ipywidgets/embed.py in <genexpr>(.0)
    266     widget_views = u'\n'.join(
    267         widget_view_template.format(view_spec=escape_script(json.dumps(view_spec)))
--> 268         for view_spec in data['view_specs']
    269     )
    270 

~/miniconda3/lib/python3.7/site-packages/ipywidgets/embed.py in escape_script(s)
    239     involving `<` is readable.
    240     """
--> 241     return script_escape_re.sub(r'\u003c\1', s)
    242 
    243 @doc_subst(_doc_snippets)

~/miniconda3/lib/python3.7/re.py in _subx(pattern, template)
    307 def _subx(pattern, template):
    308     # internal: Pattern.sub/subn implementation helper
--> 309     template = _compile_repl(template, pattern)
    310     if not template[0] and len(template[1]) == 1:
    311         # literal replacement

~/miniconda3/lib/python3.7/re.py in _compile_repl(repl, pattern)
    298 def _compile_repl(repl, pattern):
    299     # internal: compile replacement pattern
--> 300     return sre_parse.parse_template(repl, pattern)
    301 
    302 def _expand(pattern, match, template):

~/miniconda3/lib/python3.7/sre_parse.py in parse_template(source, pattern)
   1022                 except KeyError:
   1023                     if c in ASCIILETTERS:
-> 1024                         raise s.error('bad escape %s' % this, len(this))
   1025                 lappend(this)
   1026         else:

error: bad escape \u at position 0 

Answer 1

这是 Python 3.7 中的一个错误，以及 Python 3.6 中的一个问题(但在 Python 2.7 中没问题)。

如果您在 re.sub 函数中使用原始字符串(以“r”为前缀)进行替换，则 \u 会被转义。例如，r'\u003c\1' 类似于 '\\u003c\\1':这是一个字符串 '\u' ，后跟 '003c' 和 \1。

解决方案是这样写:

return script_escape_re.sub('\u003c\\1', s)

引用documentation :

Changed in version 3.7: Unknown escapes in repl consisting of '\' and an ASCII letter now are errors.