无法在 windows 的 virtualenv 中安装 psycopg2

Question

我正在尝试在我的 VirtualEnv 中安装 Psycopg2，最初我遇到了找不到 pg_config.exe 的错误，我通过在 PATH 中添加完整路径来解决它。

但随后它给出了错误 Microsoft Visual C++ 14.0 is required。要删除它，我安装了 VC_redist.x64 VC_redist.x86。

我还在 VS 社区中安装了 C++ 开发模块。但它仍然给出这个错误。

编辑：还下载并安装了 VS 构建工具。

我的环境：Windows 10 SL、Python 3.8.0、VirtualEnv 16.7.7、pip 19.3.1

    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQfreemem
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQencryptPasswordConn
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQencryptPassword
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQinitOpenSSL
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQconninfoParse
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQerrorMessage
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQlibVersion
    psycopgmodule.obj : error LNK2001: unresolved external symbol _PQconninfoFree
    green.obj : error LNK2001: unresolved external symbol _PQclear
    pqpath.obj : error LNK2001: unresolved external symbol _PQbinaryTuples
    pqpath.obj : error LNK2001: unresolved external symbol _PQsetnonblocking
    pqpath.obj : error LNK2001: unresolved external symbol _PQgetvalue
    pqpath.obj : error LNK2001: unresolved external symbol _PQresultStatus
    pqpath.obj : error LNK2001: unresolved external symbol _PQoidValue
    pqpath.obj : error LNK2001: unresolved external symbol _PQcmdStatus
    pqpath.obj : error LNK2001: unresolved external symbol _PQsocket
    pqpath.obj : error LNK2001: unresolved external symbol _PQftablecol
    pqpath.obj : error LNK2001: unresolved external symbol _PQputCopyData
    pqpath.obj : error LNK2001: unresolved external symbol _PQstatus
    pqpath.obj : error LNK2001: unresolved external symbol _PQisBusy
    pqpath.obj : error LNK2001: unresolved external symbol _PQconsumeInput
    pqpath.obj : error LNK2001: unresolved external symbol _PQresultErrorField
    pqpath.obj : error LNK2001: unresolved external symbol _PQfsize
    pqpath.obj : error LNK2001: unresolved external symbol _PQfname
    pqpath.obj : error LNK2001: unresolved external symbol _PQsendQuery
    pqpath.obj : error LNK2001: unresolved external symbol _PQgetCopyData
    pqpath.obj : error LNK2001: unresolved external symbol _PQftable
    pqpath.obj : error LNK2001: unresolved external symbol _PQflush
    pqpath.obj : error LNK2001: unresolved external symbol _PQftype
    pqpath.obj : error LNK2001: unresolved external symbol _PQnfields
    pqpath.obj : error LNK2001: unresolved external symbol _PQresultErrorMessage
    pqpath.obj : error LNK2001: unresolved external symbol _PQexec
    pqpath.obj : error LNK2001: unresolved external symbol _PQfmod
    pqpath.obj : error LNK2001: unresolved external symbol _PQcmdTuples
    pqpath.obj : error LNK2001: unresolved external symbol _PQntuples
    pqpath.obj : error LNK2001: unresolved external symbol _PQresStatus
    pqpath.obj : error LNK2001: unresolved external symbol _PQputCopyEnd
    pqpath.obj : error LNK2001: unresolved external symbol _PQgetResult
    utils.obj : error LNK2001: unresolved external symbol _PQescapeString
    utils.obj : error LNK2001: unresolved external symbol _PQescapeStringConn
    utils.obj : error LNK2001: unresolved external symbol _PQescapeIdentifier
    connection_int.obj : error LNK2001: unresolved external symbol _PQconnectPoll
    connection_int.obj : error LNK2001: unresolved external symbol _PQserverVersion
    connection_int.obj : error LNK2001: unresolved external symbol _PQnotifies
    connection_int.obj : error LNK2001: unresolved external symbol _PQsetNoticeProcessor
    connection_int.obj : error LNK2001: unresolved external symbol _PQgetCancel
    connection_int.obj : error LNK2001: unresolved external symbol _PQfinish
    connection_int.obj : error LNK2001: unresolved external symbol _PQprotocolVersion
    connection_int.obj : error LNK2001: unresolved external symbol _PQfreeCancel
    connection_int.obj : error LNK2001: unresolved external symbol _PQconnectdb
    connection_int.obj : error LNK2001: unresolved external symbol _PQconnectStart
    connection_int.obj : error LNK2001: unresolved external symbol _PQparameterStatus
    connection_type.obj : error LNK2001: unresolved external symbol _PQcancel
    connection_type.obj : error LNK2001: unresolved external symbol _PQtransactionStatus
    connection_type.obj : error LNK2001: unresolved external symbol _PQbackendPID
    connection_type.obj : error LNK2001: unresolved external symbol _PQconninfo
    cursor_type.obj : error LNK2001: unresolved external symbol _PQgetisnull
    cursor_type.obj : error LNK2001: unresolved external symbol _PQgetlength
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQsslInUse
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQconnectionNeedsPassword
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQpass
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQdb
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQsslAttribute
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQport
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQoptions
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQconnectionUsedPassword
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQsslAttributeNames
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQuser
    conninfo_type.obj : error LNK2001: unresolved external symbol _PQhost
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_truncate
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_write
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_export
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_import
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_creat
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_read
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_tell
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_create
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_lseek
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_unlink
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_open
    lobject_int.obj : error LNK2001: unresolved external symbol _lo_close
    adapter_binary.obj : error LNK2001: unresolved external symbol _PQescapeByteaConn
    adapter_binary.obj : error LNK2001: unresolved external symbol _PQescapeBytea
    build\lib.win32-3.8\psycopg2\_psycopg.cp38-win32.pyd : fatal error LNK1120: 83 unresolved externals
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.23.28105\\bin\\HostX86\\x86\\link.exe' failed with exit status 1120

背景：我正在使用 pgSQL 的 Django 中进行开发，由于某些原因，我进行了 Windows 的全新安装，并且在 Windows 安装后，我运行了我的 virtualenv，但它无法检测到任何包（可能是因为我的 env 是在python 3.7，现在我有了 python 3.8（虽然我确实尝试用 python 3.7 安装它））。所以我不得不重建 virtualenv，目前卡在 psycopg2 上

Answer 1

安装python 64位版本（官网x86-64）。我遇到了同样的问题，做了你所做的 evrt 并且它没有工作，在安装了正确版本的 python 后，我解决了这个问题。