【异常】‘for’ loop initial declarations are only allowed in C99 mode

1 Python版本导致的异常

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/root/Python-3.5.7/Modules/_pickle.c: In function ‘PyMemoTable_Copy’: /root/Python-3.5.7/Modules/_pickle.c:677:5: error: ‘for’ loop initial declarations are only allowed in C99 mode      for (size_t i = 0; i < self->mt_allocated; i++) {      ^ /root/Python-3.5.7/Modules/_pickle.c:677:5: note: use option -std=c99 or -std=gnu99 to compile your code /root/Python-3.5.7/Modules/_pickle.c: In function ‘_pickle_PicklerMemoProxy_copy_impl’: /root/Python-3.5.7/Modules/_pickle.c:4207:5: error: ‘for’ loop initial declarations are only allowed in C99 mode      for (size_t i = 0; i < memo->mt_allocated; ++i) {      ^ /root/Python-3.5.7/Modules/_pickle.c: In function ‘Unpickler_set_memo’: /root/Python-3.5.7/Modules/_pickle.c:6794:9: error: ‘for’ loop initial declarations are only allowed in C99 mode          for (size_t i = 0; i < new_memo_size; i++) {          ^ /root/Python-3.5.7/Modules/_pickle.c:6842:9: error: ‘for’ loop initial declarations are only allowed in C99 mode          for (size_t i = new_memo_size - 1; i != SIZE_MAX; i--) {          ^

　　 ‘for’ loop initial declarations are only allowed in C99 mode 这段话的意思是 只允许再C99模式中

 

2 所以换个python版本，就不再报错了（换了3.6版本）