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Thank for your attention.
I try it:
suzc@linux-opensuse:22:02:51:Python-2.7.3$ PYTHONPATH=/WORK/suzc/installed/python/lib/python2.7 ./python -c 'import sys; print(sys.path)'
['', '/WORK/suzc/installed/python/lib/python2.7', '/WORK/suzc/installed/python/lib/python27.zip', '/WORK/suzc/installed/python/lib/python2.7/plat-linux2', '/WORK/suzc/installed/python/lib/python2.7/lib-tk', '/WORK/suzc/installed/python/lib/python2.7/lib-old', '/WORK/suzc/installed/python/lib/python2.7/lib-dynload', '/WORK/suzc/.local/lib/python2.7/site-packages', '/WORK/suzc/installed/python/lib/python2.7/site-packages']
suzc@linux-opensuse:22:03:03:Python-2.7.3$ PYTHONPATH=/WORK/suzc/installed/python/lib/python2.7 \
> ./python -c 'import _struct; print(_struct.__file__)'
Traceback (most recent call last):
 File "<string>", line 1, in <module>
ImportError: No module named _struct 1
suzc@linux-opensuse:22:03:23:Python-2.7.3$
And I read the log of make, it seems to be compiled OK:
-----------------------------------------------------------------
ranlib libpython2.7.a
gcc -pthread -Xlinker -export-dynamic -o python \
 Modules/python.o \
 libpython2.7.a -lpthread -ldl -lutil -lm
running build
running build_ext
building dbm using ndbm
building '_struct' extension
gcc -pthread -fPIC -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -I/usr/local/include -I/WORK/suzc/software/Python-2.7.3/Include -I/WORK/suzc/software/Python-2.7.3 -c /WORK/suzc/software/Python-2.7.3/Modules/_struct.c -o build/temp.linux-x86_64-2.7/WORK/suzc/software/Python-2.7.3/Modules/_struct.o
gcc -pthread -shared build/temp.linux-x86_64-2.7/WORK/suzc/software/Python-2.7.3/Modules/_struct.o -L/WORK/suzc/installed/python/lib64 -L/usr/local/lib -o build/lib.linux-x86_64-2.7/_struct.so
building '_ctypes_test' extension
-----------------------------------------------------------------
_struct.o and _struct.so are just there, I truely don't know what's wrong.
Newly to Python, I think python should not have such an installation problem.
I installed it(2.7.3) on RHEL5, works OK, but I want to install OpenSSL to it, don't know how to do it, so I learn to install it on SUSE in my workplace while RHEL5 is in another place. 
RHEL5 has python 2.4.2, in my memory. SUSE12 has python 2.7.2.
Does system's python affect my installtion? But I think it shouldn't.
In fact, long before I downloaded a compressed package named Python-2.7.3.tar.bz2, with this one, I can make && make install, but I can't run it, error is:
suzc@linux-opensuse:22:12:31:bin$ ./python2.7
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Traceback (most recent call last):
 File "/WORK/suzc/installed/python/lib/python2.7/site.py", line 564, in <module >
 main()
 File "/WORK/suzc/installed/python/lib/python2.7/site.py", line 546, in main
 known_paths = addusersitepackages(known_paths)
 File "/WORK/suzc/installed/python/lib/python2.7/site.py", line 279, in adduser sitepackages
 user_site = getusersitepackages()
 File "/WORK/suzc/installed/python/lib/python2.7/site.py", line 254, in getuser sitepackages
 user_base = getuserbase() # this will also set USER_BASE
 File "/WORK/suzc/installed/python/lib/python2.7/site.py", line 244, in getuser base
 USER_BASE = get_config_var('userbase')
 File "/WORK/suzc/installed/python/lib/python2.7/sysconfig.py", line 521, in ge t_config_var
 return get_config_vars().get(name)
 File "/WORK/suzc/installed/python/lib/python2.7/sysconfig.py", line 420, in ge t_config_vars
 _init_posix(_CONFIG_VARS)
 File "/WORK/suzc/installed/python/lib/python2.7/sysconfig.py", line 288, in _i nit_posix
 raise IOError(msg)
IOError: invalid Python installation: unable to open /WORK/suzc/installed/python /lib/python2.7/config/Makefile (No such file or directory) 
I'm crazy about this, I search it in google, no satisfatory answers. So I want to download a new one 2.7.3, and install, but i just can not install it.
Thanks again.