我阅读了几个示例，这些示例展示了 pymysql“选择输入”应该如何工作。所以，这个例子工作得很好：
sql_select = 'SELECT a.user_id, AVG(a.rcount) AS \'average\' ' \
'FROM (SELECT user_id, item_id, count(*) AS rcount ' \
'FROM submission AS qsm ' \
'JOIN metadata as qm ' \
'ON qsm.item_id = qm.id ' \
'WHERE qsm.item_id NOT IN (1, 2, 5, 6, 7, 147, 148) ' \
'AND DATE(FROM_UNIXTIME(submission_time)) BETWEEN %s AND %s ' \
'AND qm.type != \'survey\' ' \
'GROUP BY user_id, item_id ' \
'ORDER BY user_id) a ' \
'GROUP BY a.user_id' …我知道我做错了什么，但我不知道是什么......我正在尝试使用数据立方体词汇生成 RDF 文件。
问题是，输出应该如下所示：
<qb:DataSet rdf:about="about...">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">label.</rdfs:label>
<dcterms:subject rdf:resource="http://purl.org/linked-data/sdmx/2009/subject#2.2"/>
...
但是，我得到的只是：
<qb:DataSet rdf:about="about...">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">.</rdfs:label>
<dcterms:subject>
<rdf:Thing rdf:about="http://purl.org/linked-data/sdmx/2009/subject#2.2"/>
</dcterms:subject>
我可以提供代码示例，但这可能就足够了......问题不应该那么难。我需要资源和另一个资源...
最好的，斯雷科
我在Linux Mint（平台i686-pc-linux-gnu）上安装了R 3.4.1，但以前的R版本以及Windows都发生了同样的问题。当我尝试安装igraph使用install.packages()，这个错误发生的情况：
foreign-graphml.c: In function ‘igraph_write_graph_graphml’:
foreign-graphml.c:1408:46: error: expected ‘)’ before ‘GRAPHML_NAMESPACE_URI’
ret=fprintf(outstream, "<graphml xmlns=\"" GRAPHML_NAMESPACE_URI "\"\n");
^
foreign-graphml.c:1412:59: error: expected ‘)’ before ‘GRAPHML_NAMESPACE_URI’
ret=fprintf(outstream, " xsi:schemaLocation=\"" GRAPHML_NAMESPACE_URI "\n");
^
foreign-graphml.c:1414:38: error: expected ‘)’ before ‘GRAPHML_NAMESPACE_URI’
ret=fprintf(outstream, " " GRAPHML_NAMESPACE_URI "/1.0/graphml.xsd\">\n");
^
/usr/lib/R/etc/Makeconf:159: recipe for target 'foreign-graphml.o' failed
make: *** [foreign-graphml.o] Error 1
ERROR: compilation failed for package ‘igraph’
* removing ‘/home/ninja/R/i686-pc-linux-gnu-library/3.4/igraph’
Warning in install.packages :
installation of package ‘igraph’ had non-zero exit status
我也尝试使用类似的方法从github安装： …