最新亲测可用的免费google翻译api
google翻译的水平越来越高，用处还不少，每次通过访问translate.google.cn来复制粘贴觉得效率太慢。
官方的google翻译好像要收费，找了一圈google翻译的免费api，特别是github上面的，发现好些开源项目已经过时，因为google更新了ttk的token。
找了好些java语言发现不可用，最后发现这个python开源项目更新日期挺近的，亲测是可用，免费而且速度很快。
https://github.com/Saravananslb/py-googletranslation
这个开源项目要求依赖是 Python 3.6+ 。如果没安装的可以到 这里下载： https://www.python.org/downloads/release/python-391/
。为了使用方便，安装了带pip管理工具的。
下载py-googletranslation，
$ pip install pygoogletranslation
为了科学上网,原来开源项目默认的google.com是访问不了的，要做下面修改，或直接找到下载代码，把google.com修改为google.cn
>>> from googletrans import Translator
>>> translator = Translator(service_urls=[
'translate.google.cn',
])基础用法：
如果没有指定源语言，会自动侦测源语言
>>> from pygoogletranslation import Translator
>>> translator = Translator()
>>> translator.translate('Good Morning', dest='ta')
#
>>> translator.translate('안녕하세요.', dest='ja')
#
>>> translator.translate('veritas lux mea', src='la')
# 高级用法（批量）：
可以使用数组批量翻译，只是简单调用一个http session
>>> from pygoogletranslation import Translator
>>> translator = Translator()
>>> t = (translator.translate(["Good ' Morning", "India"], dest="ta"))
>>> for _t in t:
>>> print(_t.text)
# காலை வணக்கம்
# இந்தியா语言检测：
>>> from pygoogletranslation import Translator
>>> translator = Translator()
>>> translator.detect('காலை வணக்கம்,')
#
>>> translator.detect('この文章は日本語で書かれました。')
#
>>> translator.detect('This sentence is written in English.')
#
>>> translator.detect('Tiu frazo estas skribita en Esperanto.')
#
翻译文档类型的（.doc, .docx, .pdf, .txt）：
>>> from pygoogletranslation import Translator
>>> translator = Translator()
>>> translator.bulktranslate('test.txt', dest="ta")
#
# for bulk translation, sometimes you might get an error with response
# code "429" - Too Many attempts.
# To overcome this error, add below parameter.
>>> translator = Translator(retry=NO_OF_ATTEMPTS, sleep=WAIT_SECONDS, retry_message=TRUE)
>>> translator.bulktranslate('test.txt', dest="ta")
# retry - no of attemps (default- 3 times)
# sleep - no of attempts after seconds (default- 5 seconds)
# retry_message - True - display retrying message (default- False) 调用python例子：调用google翻译demo
pygoogletranslation定义的语言列表
>>> from pygoogletranslation import Translator
>>> translator = Translator()
>>> translator.glanguage()
>>> {
"sl": {
"auto": "Detect language",
"af": "Afrikaans",
"sq": "Albanian",
"am": "Amharic",
"ar": "Arabic",
"hy": "Armenian",
"az": "Azerbaijani",
"eu": "Basque",
"be": "Belarusian",
"bn": "Bengali",
"bs": "Bosnian",
"bg": "Bulgarian",
"ca": "Catalan",
"ceb": "Cebuano",
"ny": "Chichewa",
"zh-CN": "Chinese",
"co": "Corsican",
"hr": "Croatian",
"cs": "Czech",
"da": "Danish",
"nl": "Dutch",
"en": "English",
"eo": "Esperanto",
"et": "Estonian",
"tl": "Filipino",
"fi": "Finnish",
"fr": "French",
"fy": "Frisian",
"gl": "Galician",
"ka": "Georgian",
"de": "German",
"el": "Greek",
"gu": "Gujarati",
"ht": "Haitian Creole",
"ha": "Hausa",
"haw": "Hawaiian",
"iw": "Hebrew",
"hi": "Hindi",
"hmn": "Hmong",
"hu": "Hungarian",
"is": "Icelandic",
"ig": "Igbo",
"id": "Indonesian",
"ga": "Irish",
"it": "Italian",
"ja": "Japanese",
"jw": "Javanese",
"kn": "Kannada",
"kk": "Kazakh",
"km": "Khmer",
"rw": "Kinyarwanda",
"ko": "Korean",
"ku": "Kurdish (Kurmanji)",
"ky": "Kyrgyz",
"lo": "Lao",
"la": "Latin",
"lv": "Latvian",
"lt": "Lithuanian",
"lb": "Luxembourgish",
"mk": "Macedonian",
"mg": "Malagasy",
"ms": "Malay",
"ml": "Malayalam",
"mt": "Maltese",
"mi": "Maori",
"mr": "Marathi",
"mn": "Mongolian",
"my": "Myanmar (Burmese)",
"ne": "Nepali",
"no": "Norwegian",
"or": "Odia (Oriya)",
"ps": "Pashto",
"fa": "Persian",
"pl": "Polish",
"pt": "Portuguese",
"pa": "Punjabi",
"ro": "Romanian",
"ru": "Russian",
"sm": "Samoan",
"gd": "Scots Gaelic",
"sr": "Serbian",
"st": "Sesotho",
"sn": "Shona",
"sd": "Sindhi",
"si": "Sinhala",
"sk": "Slovak",
"sl": "Slovenian",
"so": "Somali",
"es": "Spanish",
"su": "Sundanese",
"sw": "Swahili",
"sv": "Swedish",
"tg": "Tajik",
"ta": "Tamil",
"tt": "Tatar",
"te": "Telugu",
"th": "Thai",
"tr": "Turkish",
"tk": "Turkmen",
"uk": "Ukrainian",
"ur": "Urdu",
"ug": "Uyghur",
"uz": "Uzbek",
"vi": "Vietnamese",
"cy": "Welsh",
"xh": "Xhosa",
"yi": "Yiddish",
"yo": "Yoruba",
"zu": "Zulu"
},
"tl": {
"af": "Afrikaans",
"sq": "Albanian",
"am": "Amharic",
"ar": "Arabic",
"hy": "Armenian",
"az": "Azerbaijani",
"eu": "Basque",
"be": "Belarusian",
"bn": "Bengali",
"bs": "Bosnian",
"bg": "Bulgarian",
"ca": "Catalan",
"ceb": "Cebuano",
"ny": "Chichewa",
"zh-CN": "Chinese (Simplified)",
"zh-TW": "Chinese (Traditional)",
"co": "Corsican",
"hr": "Croatian",
"cs": "Czech",
"da": "Danish",
"nl": "Dutch",
"en": "English",
"eo": "Esperanto",
"et": "Estonian",
"tl": "Filipino",
"fi": "Finnish",
"fr": "French",
"fy": "Frisian",
"gl": "Galician",
"ka": "Georgian",
"de": "German",
"el": "Greek",
"gu": "Gujarati",
"ht": "Haitian Creole",
"ha": "Hausa",
"haw": "Hawaiian",
"iw": "Hebrew",
"hi": "Hindi",
"hmn": "Hmong",
"hu": "Hungarian",
"is": "Icelandic",
"ig": "Igbo",
"id": "Indonesian",
"ga": "Irish",
"it": "Italian",
"ja": "Japanese",
"jw": "Javanese",
"kn": "Kannada",
"kk": "Kazakh",
"km": "Khmer",
"rw": "Kinyarwanda",
"ko": "Korean",
"ku": "Kurdish (Kurmanji)",
"ky": "Kyrgyz",
"lo": "Lao",
"la": "Latin",
"lv": "Latvian",
"lt": "Lithuanian",
"lb": "Luxembourgish",
"mk": "Macedonian",
"mg": "Malagasy",
"ms": "Malay",
"ml": "Malayalam",
"mt": "Maltese",
"mi": "Maori",
"mr": "Marathi",
"mn": "Mongolian",
"my": "Myanmar (Burmese)",
"ne": "Nepali",
"no": "Norwegian",
"or": "Odia (Oriya)",
"ps": "Pashto",
"fa": "Persian",
"pl": "Polish",
"pt": "Portuguese",
"pa": "Punjabi",
"ro": "Romanian",
"ru": "Russian",
"sm": "Samoan",
"gd": "Scots Gaelic",
"sr": "Serbian",
"st": "Sesotho",
"sn": "Shona",
"sd": "Sindhi",
"si": "Sinhala",
"sk": "Slovak",
"sl": "Slovenian",
"so": "Somali",
"es": "Spanish",
"su": "Sundanese",
"sw": "Swahili",
"sv": "Swedish",
"tg": "Tajik",
"ta": "Tamil",
"tt": "Tatar",
"te": "Telugu",
"th": "Thai",
"tr": "Turkish",
"tk": "Turkmen",
"uk": "Ukrainian",
"ur": "Urdu",
"ug": "Uyghur",
"uz": "Uzbek",
"vi": "Vietnamese",
"cy": "Welsh",
"xh": "Xhosa",
"yi": "Yiddish",
"yo": "Yoruba",
"zu": "Zulu"
},
"al": {}
}