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QuestionPython 2.7: Best way for processes to log to single log file Pin
ninjaef5-Jul-18 21:39
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AnswerRe: Python 2.7: Best way for processes to log to single log file Pin
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QuestionMemento pattern and releasing resources Pin
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QuestionPython: how doI "select / switch in" a module/class to use at runtime Pin
ninjaef3-Jul-18 0:09
memberninjaef3-Jul-18 0:09 
So I have this design in Python2.7. Basically it is an EPG app that can read EPG programme events from 1 or more XMLTV sources. I would like to be able to use a generic code base and switch-in the XMLTV parsing code. For example, in 'C' I can use:

epg.c:

#ifdef _XMLTV_rytec
#include ./xmltv/rytec.h
#endif
#ifdef _XMLTTV_bbc
#include ./xmltv/bbc.h
#endif
...
...
// Make call to external xmltv function declared in .h file (above)
// and defined in an external module compiled in using a Makefile
load_xmltv()
...
...
So what i can do here is define the preprocessor macros (_XMLTV_*) at make time, use the compiler directives to pull in the appropriate definitions for the desired xmltv parser, and switch in the corresponding source/object module (rytec.c/rytec.o and bbc.c/bbc.o) using the Makefile. Here for example, if XMLTV is not defined outside the Makefile at build (i.e. command line option) then the default rytec module is built in.

Makefile:
..
XMLTV_OBJS = ./src/xmltv/rytec.o
EPG_OBJS = epg.o $(XMLTV_OBJS)
..
obj/%.o:%.c
    gcc -c -o $@ $(CPPFLAGS) $(CFLAGS) $<

epg: $(EPG_OBJS) \
     gcc -o $@ $(CFLAGS) $(EPG_OBJS) $(LDFLAGS) $(LDLIBS)

..
How can I achieve the same thing in Python please?

modified 3-Jul-18 6:27am.

AnswerRe: Python: how doI "select / switch in" a module/class to use at runtime Pin
Richard MacCutchan3-Jul-18 2:13
protectorRichard MacCutchan3-Jul-18 2:13 
GeneralRe: Python: how doI "select / switch in" a module/class to use at runtime Pin
ninjaef3-Jul-18 3:24
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GeneralRe: Python: how doI "select / switch in" a module/class to use at runtime Pin
Richard MacCutchan3-Jul-18 4:26
protectorRichard MacCutchan3-Jul-18 4:26 
GeneralRe: Python: how doI "select / switch in" a module/class to use at runtime Pin
ninjaef3-Jul-18 7:14
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GeneralRe: Python: how doI "select / switch in" a module/class to use at runtime Pin
Richard MacCutchan3-Jul-18 8:25
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QuestionMy Entity Framework Design Pin
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GeneralRe: My Entity Framework Design Pin
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