import fileinput guard = 0 cxxguard = '#ifdef __cplusplus\n' for line in fileinput.input(inplace=True): if line == cxxguard: guard = 1 continue if guard: if line == 'extern "C" {\n': guard = 2 continue if line == '}\n': guard = 0 continue if guard == 2: assert(line == '#endif\n') guard = 0 print cxxguard, continue print line,