问题
I am trying to produce few charts in a loop and save them automatically.
I am working on Windows, using Chrome.
I have been following the documentation on how to save a chart in svg.
I downloaded the appropriate ChromeDriver for my Chrome version.
gdf is my geodataframe and everything works smoothly and I can generate and manually save charts.
Below is the piece of code I am trying to run:
#Chromedriver for headless run and chart automatic save
from selenium import webdriver
driver = webdriver.Chrome('pathtochromedriver/chromedriver_win32/chromedriver.exe')
#loop
for group in gdf['Group Name'].unique():
map_1km_json = json.loads(gdf[gdf['Group Name']==group].to_json())
map_1km_data = alt.Data(values=map_1km_json['features'])
data_1km_geojson = alt.InlineData(values=map_1km, format=alt.DataFormat(property='features',type='json'))
domain=[1,2]
range_=['#b0d247','#007bd1']
choro1_5 = alt.Chart(map_1km_data).mark_geoshape().encode(
alt.Color('properties.Cat2:O', scale=alt.Scale(domain=domain, range=range_),title = "Havvandsstigning"),
#alt.Color('properties.Cat2', type='quantitative', scale=alt.Scale(scheme='plasma'),title = "Havvandsstigning")
tooltip = ['properties.dd_km1:N','properties.Cat2:N']
).properties(
width=1100,
height=800
)
(background + choro1_5).save("{}.svg".format(bank))
driver.quit()
Running the code opens an empty new chrome pane (in the background) that looks like this:
But the code returns the following error:
---------------------------------------------------------------------------
FileNotFoundError Traceback (most recent call last)
~\Anaconda3\lib\site-packages\selenium\webdriver\common\service.py in start(self)
75 stderr=self.log_file,
---> 76 stdin=PIPE)
77 except TypeError:
~\Anaconda3\lib\subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors, text)
774 errread, errwrite,
--> 775 restore_signals, start_new_session)
776 except:
~\Anaconda3\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_start_new_session)
1177 os.fspath(cwd) if cwd is not None else None,
-> 1178 startupinfo)
1179 finally:
FileNotFoundError: [WinError 2] The system cannot find the file specified
During handling of the above exception, another exception occurred:
WebDriverException Traceback (most recent call last)
<ipython-input-27-6067387e4b2f> in <module>
19 height=800
20 )
---> 21 (background + choro1_5).save("{}.svg".format(bank))
22 driver.quit()
~\Anaconda3\lib\site-packages\altair\vegalite\v3\api.py in save(self, fp, format, override_data_transformer, scale_factor, vegalite_version, vega_version, vegaembed_version, **kwargs)
478 if override_data_transformer:
479 with data_transformers.disable_max_rows():
--> 480 result = save(**kwds)
481 else:
482 result = save(**kwds)
~\Anaconda3\lib\site-packages\altair\utils\save.py in save(chart, fp, vega_version, vegaembed_version, format, mode, vegalite_version, embed_options, json_kwds, webdriver, scale_factor, **kwargs)
102 vegaembed_version=vegaembed_version,
103 webdriver=webdriver,
--> 104 scale_factor=scale_factor, **kwargs)
105 if format == 'png':
106 write_file_or_filename(fp, mimebundle['image/png'], mode='wb')
~\Anaconda3\lib\site-packages\altair\utils\mimebundle.py in spec_to_mimebundle(spec, format, mode, vega_version, vegaembed_version, vegalite_version, **kwargs)
54 vega_version=vega_version,
55 vegaembed_version=vegaembed_version,
---> 56 vegalite_version=vegalite_version, **kwargs)
57 if format == 'png':
58 render = base64.b64decode(render.split(',', 1)[1].encode())
~\Anaconda3\lib\site-packages\altair\utils\headless.py in compile_spec(spec, format, mode, vega_version, vegaembed_version, vegalite_version, scale_factor, driver_timeout, webdriver)
152 webdriver_options.add_argument('--no-sandbox')
153
--> 154 driver = webdriver_class(options=webdriver_options)
155
156 try:
~\Anaconda3\lib\site-packages\selenium\webdriver\chrome\webdriver.py in __init__(self, executable_path, port, options, service_args, desired_capabilities, service_log_path, chrome_options, keep_alive)
71 service_args=service_args,
72 log_path=service_log_path)
---> 73 self.service.start()
74
75 try:
~\Anaconda3\lib\site-packages\selenium\webdriver\common\service.py in start(self)
81 raise WebDriverException(
82 "'%s' executable needs to be in PATH. %s" % (
---> 83 os.path.basename(self.path), self.start_error_message)
84 )
85 elif err.errno == errno.EACCES:
WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home
来源：https://stackoverflow.com/questions/59894483/altair-automatic-save-chart-as-svg-using-selenium-chromedriver