Django学习排错备注

一、ImproperlyConfigured: Error loading either pysqlite2 or sqlite3 modules (tried in that order): No module named _sqlite3

　　学习Django第五章的模型的时候，图省事，用了sqlite，当时修改完settings.py时，用python manage.py shell启动时，却报如上所示错误。

　　平台环境：Centos 5.8， python 2.7.4，django 1.5.1

　　解决步骤

　　1、google搜索半天，发现不是django配置的问题，而是python的环境问题，有人说是sqlite-devel没有装，要安装后reinstall python，于是yum -y install sqlite-devel后想重装python

但是make的时候发现build sqlite3时报错：Failed to build these modules: _sqlite3

无奈又上网搜索，在强大的stackoverflow里看到了一个解决方法，原来这是python 2.7.x的bug，在这里（http://bugs.python.org/issue14572）发布了补丁，

先cd到python的源码解压后的目录，执行curl -sk https://raw.github.com/gist/2727063/ | patch -p1，然后重新make，结果还是报同样的错误，又无语了。

后来在网上搜索的时候发现了一个脚本，这个脚本作用是安装python2.7.2的，也可以修改里面的参数，用于安装其他版本！

脚本下载地址找不到了，附上内容吧

#!/bin/bash
# v0.0.1
# Compile Python 2.7.2 from scratch 
# Tested on Centos 5.8
CURR_DIR=/usr/local
SRCDIR="$CURR_DIR/src"
BUILDDIR="$CURR_DIR/build"

# Create Source Directories
if [ ! -d "$SRCDIR" ]
then
    mkdir -pv $SRCDIR
fi

if [ ! -d "BUILDDIR" ]
then
    mkdir -pv $BUILDDIR
fi


pybuild_remove() {
    echo Removing all set ENV Vars
    unset PREFIX CFLAGS CPPFLAGS LDFLAGS LD_RUN_PATH C_INCLUDE_PATH
    unset CPLUS_INCLUDE_PATH
}

pybuild_add() {
    echo Adding default ENV Vars
    export PREFIX="/usr/local/python2.7.2"
    export C_INCLUDE_PATH="$PREFIX/include"
    export CPLUS_INCLUDE_PATH=$C_INCLUDE_PATH
    export LIBRARY_PATH="$PREFIX/lib"
    export LD_RUN_PATH="$PREFIX/lib"
}

pybuild_add_prepython() {
    echo Adding pre Python build includes
    export C_INCLUDE_PATH="$PREFIX/include/ncurses:$PREFIX/include/readline:$PREFIX/include/openssl:$C_INCLUDE_PATH"
    export CPLUS_INCLUDE_PATH="$C_INCLUDE_PATH"
}

build_cleanup() {
    echo cleaning up $BUILDDIR
    cd $BUILDDIR
    rm -rf $BUILDDIR/*
}

dl_if_none() {
    # takes 2 parameters
    # $1 - filename
    # $2 - url
    echo Downloading source file
    if [ -e "$SRCDIR/$1" ]
    then
        echo Source file $1 already exists
    else
        wget $2 -O "$SRCDIR/$1"
    fi
}

pybuild_sqlite3() {
    dl_if_none sqlite-autoconf-3071000.tar.gz http://www.sqlite.org/sqlite-autoconf-3071000.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/sqlite*
    cd $BUILDDIR/sqlite*
    pybuild_add
    ./configure --prefix=$PREFIX
    make
    make install
    pybuild_remove
    build_cleanup
}


pybuild_bzip2() {
    dl_if_none bzip2-1.0.6.tar.gz http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/bzip2*
    cd $BUILDDIR/bzip2*
    pybuild_add
    make -f Makefile-*
    make install PREFIX=$PREFIX
    make
    make install PREFIX=$PREFIX
    pybuild_remove
    build_cleanup
}


pybuild_zlib() {
    dl_if_none zlib-1.2.5.tar.gz http://zlib.net/zlib-1.2.5.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/zlib*
    cd $BUILDDIR/zlib*
    pybuild_add
    ./configure --prefix=$PREFIX
    make
    make install
    pybuild_remove
    build_cleanup
}


pybuild_openssl() {
    dl_if_none openssl-1.0.0g.tar.gz http://www.openssl.org/source/openssl-1.0.0g.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/openssl*
    cd $BUILDDIR/openssl*
    pybuild_add
    ./config --prefix=$PREFIX -I$PREFIX/include -L$PREFIX/lib threads shared --openssldir=$PREFIX/openssl zlib
    make
    make install
    pybuild_remove
    build_cleanup
}

pybuild_ncurses() {
    dl_if_none ncurses-5.9.tar.gz http://ftp.gnu.org/pub/gnu/ncurses/ncurses-5.9.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/ncurses*
    cd $BUILDDIR/ncurses*
    pybuild_add
    ./configure --with-normal --with-shared --prefix=$PREFIX --enable-rpath --enable-sp-funcs --enable-const --enable--ext-mouse
    make
    make install
    pybuild_remove
    build_cleanup
}

pybuild_readline() {
    dl_if_none readline-6.2.tar.gz ftp://ftp.gnu.org/gnu/readline/readline-6.2.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/readline*
    cd $BUILDDIR/readline*
    pybuild_add
    ./configure --prefix=$PREFIX 
    make
    make install
    pybuild_remove
    build_cleanup
}

pybuild_gdbm() {
    dl_if_none gdbm-1.10.tar.gz ftp://ftp.gnu.org/gnu/gdbm/gdbm-1.10.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/gdbm*
    cd $BUILDDIR/gdbm*
    pybuild_add
    ./configure --prefix=$PREFIX 
    make
    make install
    pybuild_remove
    build_cleanup
}

pybuild_bsdbm() {
    dl_if_none db-4.3.29.tar.gz http://download.oracle.com/berkeley-db/db-4.3.29.tar.gz
    tar -C $BUILDDIR -zxf $SRCDIR/db*
    cd $BUILDDIR/db-*/build_unix
    pybuild_add
    ../dist/configure --prefix=$PREFIX
    make
    make install
    pybuild_remove
    build_cleanup
}

pybuild_python() {
    dl_if_none Python-2.7.2.tar.bz2 http://www.python.org/ftp/python/2.7.2/Python-2.7.2.tar.bz2
    tar -C $BUILDDIR -jxf $SRCDIR/Python*
    cd $BUILDDIR/Python*
    pybuild_add
    pybuild_add_prepython
    ./configure --enable-shared --prefix=$PREFIX --enable-ipv6  --with-dbmlib
order=gdbm:bdb --with-threads
    make
    make install
    pybuild_remove
    build_cleanup
}

build_python27() {
    pybuild_remove
    pybuild_sqlite3
    pybuild_bzip2
    pybuild_zlib
    pybuild_openssl
    pybuild_ncurses
    pybuild_readline
    pybuild_gdbm
    pybuild_bsdbm
    pybuild_python
}

build_python27

重点在pybuild_sqlite3函数，原来我是因为sqlite没有装好，利用编译安装sqlite的方式后就解决这个问题了！