我正在尝试在Ubuntu 16.10上从源代码安装Python 3.6.
make test
当我进行测试时,安装会引发错误说..
======================================================================
ERROR: test_logincapa_with_client_certfile (test.test_imaplib.RemoteIMAP_SSLTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/anderson/Downloads/Python-3.6.1/Lib/test/test_imaplib.py", line 973, in test_logincapa_with_client_certfile
certfile=CERTFILE)
File "/home/anderson/Downloads/Python-3.6.1/Lib/imaplib.py", line 1280, in __init__
IMAP4.__init__(self, host, port)
File "/home/anderson/Downloads/Python-3.6.1/Lib/imaplib.py", line 197, in __init__
self.open(host, port)
File "/home/anderson/Downloads/Python-3.6.1/Lib/imaplib.py", line 1293, in open
IMAP4.open(self, host, port)
File "/home/anderson/Downloads/Python-3.6.1/Lib/imaplib.py", line 294, in open
self.sock = self._create_socket()
File "/home/anderson/Downloads/Python-3.6.1/Lib/imaplib.py", line 1285, in _create_socket
server_hostname=self.host)
File "/home/anderson/Downloads/Python-3.6.1/Lib/ssl.py", line 401, in wrap_socket
_context=self, _session=session)
File "/home/anderson/Downloads/Python-3.6.1/Lib/ssl.py", line 808, in __init__
self.do_handshake() …我只是想知道制作像django这样的web框架需要哪些知识或技术.
所以webframework能够作为一个云计算(一个网站可以通过发送一些必须解决的东西水平扩展到其他服务器).如果需要,可以用来像django一样快速建立一个网站,如果开发人员想要的话建立一个简单的网站.
抱歉.因为我是韩国人,我的英语非常尴尬.
只是给我一些方法或说明,了解构建Web框架或我必须做或学习的内容所需的技术.
非常感谢.
例如..
class Page(Document)
tags = ListField(StringField())
在这种情况下,我们可以像这样在标签列表中找到一个值.
Page.objects(tags='coding')
如果标签像['coding','x','y']那么文件将匹配......
但我的问题是如何找到不在列表字段中的值.
我的错误代码将是..
Page.objects(tags!='coding')
要么
Page.objects(tags__not = 'coding')
要么
Page.objects(tags__not__in = 'coding')
但是......他们不仅仅是工作..
如何查询ListField中没有给定值的文档？
有没有办法让图像半透明？
伪代码是这样的:
from PIL import Image
image = Image.open('image.png')
image = alpha(image, 0.5)
我用谷歌搜索了几个小时,但我找不到任何有用的东西.
如果我跑了npm run serve，那么接下来会发生什么。
INFO Starting development server...
ERROR TypeError: The 'compilation' argument must be an instance of Compilation
TypeError: The 'compilation' argument must be an instance of Compilation
at Function.getCompilationHooks (/home/anderson/@python/zeta-value/front/node_modules/webpack/lib/NormalModule.js:193:10)
at /home/anderson/@python/zeta-value/front/node_modules/vue-loader/lib/plugin-webpack5.js:39:47
at SyncHook.eval [as call] (eval at create (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/tapable/lib/HookCodeFactory.js:19:10), <anonymous>:5:1)
at SyncHook.lazyCompileHook (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/tapable/lib/Hook.js:154:20)
at Compiler.newCompilation (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/webpack/lib/Compiler.js:631:26)
at /home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/webpack/lib/Compiler.js:667:29
at AsyncSeriesHook.eval [as callAsync] (eval at create (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:4:1)
at AsyncSeriesHook.lazyCompileHook (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/tapable/lib/Hook.js:154:20)
at Compiler.compile (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/webpack/lib/Compiler.js:662:28)
at /home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/webpack/lib/Watching.js:77:18
at AsyncSeriesHook.eval [as callAsync] (eval at create (/home/anderson/@python/zeta-value/front/node_modules/@vue/cli-service/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:22:1)
at AsyncSeriesHook.lazyCompileHook …如何在 JNI 中将 char* 转换为 jcharArray？
我必须在 // TODO 注释部分放入什么代码？
JNIEXPORT jcharArray JNICALL Java_finger_FingerPrintJNI_GetVer(JNIEnv *env, jobject thisObj){
char* version = getText(); // Returns char* data type
int version_len = strlen(version);
jcharArray j_version_array = env->NewCharArray(version_len + 1);
// TODO Convert char* to jcharArray
return jcharArray;
}
添加 ================================================== ======================
正如 Gearon 建议的那样，当我输入以下代码时，会引发错误。
jchar* jVersion = (jchar*)version;
env->SetCharArrayRegion(jcharArray, 0, version_len, jVersion);
以下是错误信息。
JNIEnv_::SetCharArrayRegion(jcharArray,jsize,jsize,const jchar *)': cannot convert argument 1 from 'jchar *' to 'jcharArray'
sample.cpp(26): note: Types pointed to are unrelated; conversion …我正在阅读关于自定义过滤器的Django文档.
和..我没有看到is_safe存在的原因. https://docs.djangoproject.com/en/1.3/howto/custom-template-tags/#filters-and-auto-escaping
当我编写一些示例然后尝试它们时,无论is_safe是True还是False,结果总是相同的.
为什么使用is_safe？
这是我的代码
from django.template.defaultfilters import stringfilter
from django import template
import datetime
register = template.Library()
@register.filter(name='custom_lower')
@stringfilter
def lower(value):
is_safe = True
return '%sxx'%value
lower.is_safe = True;
from django.utils.html import conditional_escape
from django.utils.safestring import mark_safe
@register.filter(name='custom_lf')
def initial_letter_filter(text, autoescape=None):
first, other = text[0], text[1:]
if autoescape:
esc = conditional_escape
else:
esc = lambda x: x
result = '<strong>%s</strong>%s' % (esc(first), esc(other))
return mark_safe(result)
initial_letter_filter.is_safe = False
initial_letter_filter.needs_autoescape = True
我的观点是,无论我编码is_safe = True还是is_safe = False,结果都将是自动转义字符..我不明白为什么我们使用is_safe.
例如..在Mongodb ..
> db.test.findOne({}, {'mapField.FREE':1})
{
"_id" : ObjectId("4fb7b248c450190a2000006a"),
"mapField" : {
"BOXFLUX" : {
"a" : "f",
}
}
}
'mapField'字段由Mongoengine的MapField组成.'mapField'字段有一个键和数据的日志..但我只检索'BOXFLUX'..
这个查询在MongoEngine中不起作用....例如..
BoxfluxDocument.objects( ~~ querying ~~ ).only('mapField.BOXFLUX')
你可以看到.. 只有('mapField.BOXFLUX') 或只有('mapField__BOXFLUX')不起作用.它检索所有'mapField'数据,包括'BOXFLUX'一个..
如何只检索MapField的字段???
当我运行此命令以使用Python模块安装OpenCV时
cmake ../ -DCMAKE_BUILD_TYPE=RELEASE
-DCMAKE_INSTALL_PREFIX=/usr/local
-DBUILD_EXAMPLES=ON
-DBUILD_NEW_PYTHON_SUPPORT=ON
-DINSTALL_PYTHON_EXAMPLES=ON
-DPYTHON_EXECUTABLE=/usr/local/bin/python2.7
-DPYTHON_INCLUDE_DIR=/usr/local/include/python2.7/
-DPYTHON_LIBRARY=/usr/local/lib/python2.7/config/libpython2.7.a
-DPYTHON_NUMPY_INCLUDE_DIR=/usr/local/lib/python2.7/site-packages/numpy/core/include/
-DPYTHON_PACKAGES_PATH=/usr/local/lib/python2.7/site-packages/
-DBUILD_PYTHON_SUPPORT=ON
我收到此错误消息.
/usr/bin/ld: /usr/local/lib/python2.7/config/libpython2.7.a(abstract.o): relocation R_X86_64_32
against `.rodata.str1.8' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/python2.7/config/libpython2.7.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make[2]: *** [lib/cv2.so] Error 1
make[1]: *** [modules/python/CMakeFiles/opencv_python.dir/all] Error 2
make: *** [all] Error 2
我无法理解错误和错误信息.
有人能告诉我这有什么问题吗？
顺便说一句,我的操作系统是CentOS.
我使用Python2.7.5
./configure --user=boxflux
--group=boxflux
--prefix=/usr/local/nginx-1.3.0
--with-pcre=/usr/lib64
--with-md5=/usr/lib64
--with-sha1=/usr/lib64
--with-zlib=/usr/lib64
--with-libatomic=/usr/lib64
--with-openssl=/usr/lib64 | grep 'not found'
checking for sys/filio.h ... not found
checking for /dev/poll ... not found
checking for kqueue ... not found
checking for crypt() ... not found
checking for F_READAHEAD ... not found
checking for F_NOCACHE ... not found
checking for directio() ... not found
checking for dlopen() ... not found
checking for SO_SETFIB ... not found
checking for SO_ACCEPTFILTER ... not found
checking for setproctitle() ... not found …