无法导入它们：_sqlite3 ／Python3.6 ／ CentOS6

Question

Environment

# cat /etc/redhat-release

CentOS release 6.8 (Final)

$ which python3.6

/usr/local/bin/python3.6

# find /usr/local -name _sqlite3.so

/usr/local/lib/python2.7/lib-dynload/_sqlite3.so

# yum install sqlite-devel

---

When I usr SQLite3, Error occurred

No module named '_sqlite3'

---

I decided to build it from source again.

# ./configure --enable-shared --prefix=/usr/local LDFLAGS="-Wl,-rpath /usr/local/lib" --with-sqlite=/usr/local/lib/python2.7/lib-dynload/_sqlite3.so

# make

Python build finished successfully!

Following modules built successfully but were removed because they could not be imported: _sqlite3

・Why?

Answer 1

/usr/local/lib/python2.7/lib-dynload/_sqlite3.so is the Python 2 Python wrapper module and not the actual SQLite library. Moreover, --with-sqlite should point to the headers , not the shared library. Compilation requires the headers, the dynamic library is located at runtime.

Not that you need to use --with-sqlite once you installed the sqlite-devel headers; those are put in a default location that the Python configure script knows how to find, in usr/include . Only if you have headers in a non-default location would you use that option to point to the directory holding the sqlite3.h and sqlite3ext.h headers.

Once compiled, the sqlite3 Python module loads the _sqlite3*.so extension module (the exact name differs with the exact Python 3 release and platform), and the dynamic loader will find the right libsqlite3.so version.